2 4 0 T U R B O . C O M
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4-Speed Mark VIII Cooling Fan
Controller/Harness Project and Diagrams

     UPDATED: March 15, 2018                       CONTACT       
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  4-Speed Cooling Fan Controller/Harness Project
I am NOT offering fans, controllers or harnesses for sale here. You may use this info to build your own.
Before I published this page I began a forum discussion about this project.  You may find it here.

During the summer of 2016 I began looking into creating my own relay-based cooling fan controller after experiencing a succession of failures over the years of popular high-tech variable speed fan controllers that are on the market.  I came to the conclusion that most of the popular variable controllers have some nice technology, such as a soft start (ie: DCC, Flexalite, etc.), but you should NOT expect them to be reliable for years if using a high current fan like the Lincoln Mark VIII. So I needed a better alternative.  My experience over many years has been that standard relays are much more reliable. As long as you take reasonable care when building a high-current relay component harness, it will last a long time. 

Am I saying bad things about DCC?  I'm glad you asked. There are lots of people who love the Delta Current Control fan controllers. I loved them too once. Their line of PWM variable boxes are enticing in their web site and the cost is fairly reasonable. The first problem I had was when two of them failed one after the other in my 240 (they lasted 1.5 to 2 years on average). At the time I was using an early '90s Ford T-Bird fan, which pulls lots of current. I had the largest controller they offered at that time (65 amp) which was installed according to their specific instructions.  DCC has steadily increased their current capability in their controllers over the years and as of this writing their most powerful has 95 amp continuous capacity. 

I can handle failures. I was even prepared to just buy another. What I cannot deal with was my experience with DCC's non-existent customer service. When the last DCC controller failed, I ordered another on their website and paid with Paypal. I received no acknowledgement of an order, no follow-up email, and as a number of weeks went by I began to email the owner (Brian Baskin) a number of times.  My car was down the entire time!  After six weeks had gone by with nothing, I filed a Paypal dispute and eventually got my money back.  I never heard from Baskin. What kind of place does crap like this?  Not a place I ever want to deal with again. They offer a 90 day warranty, but what good is that if they NEVER ANSWER EMAILS?

They have the following statement in their site:
"In a time when profit margins govern allowable failure rates, product features are determined by the opportunity of market exploitation, and the consumer is seen as no more than a short term item of commodity, the value put upon interim revenue is clear. We see things a bit different at Delta. We appreciate the value of our customers not as commodities, but as our best means of long term market expansion. There is no better advertisement than word of mouth." 

Ha! I agree there's no better advertising than word of mouth. 
I have seen a number of forum posts and received emails from other people who have had the same experiences as I had with them. I think I'll stay away from them.

Also, I've been disappointed that so many of the high-tech fan controllers only offer threaded screw-in temp sensors designed to go into your engine (or maybe so you can have a custom bung welded on your radiator?).  I have used simple radiator fin probes for many, many years and they work pretty darn well when placed in the correct position.  Why don't more companies offer more options? Many do not.

While I'm registering complaints about options, I also noticed that if you want a fan to increase to a higher speed when your AC comes on, the ONLY option seems to be 100%.  Really? That seems short-sighted. What if youI want only 70, 80 or 90% instead of full speed for your AC?  If you're going to the trouble of building a high-tech PWM controller, isn't that a simple extra to add?  Maybe AC is not really an important thing to fan controller engineers. 

Update May 2017:
So far I have only found ONE company producing PWM controllers with an AC speed adjustable option: http://www.autocoolguy.com/. I haven't tried any of their products. It's nice that they're offering this option.

As you may have noticed, I'm now using a Lincoln Mark VIII fan and shroud (1997 model) mounted on a large Griffin aluminum radiator.  I decided to try building my own fan controller using simple, reliable relays to see if I could make one work the way I wanted. 

More general info on the installation of my Mark VIII fan and Griffin radiator in my Volvo 242 Turbo can be found in my Cooling Fan Project Page at:

Your feedback is appreciated. If you have any comments or if you decide to use this info to build something like this for yourself, I would like to hear from you.

Click on photos for larger images
<<< Diagram for 4-speed configuration.


This setup will work for any 1 or 2-speed cooling fan. If a 2-speed fan is used, I suggest using the high circuit only. I opted for using multiple adjustable temperature probes as shown. The probes can be mounted on or inserted into radiator fins or into a coolant hose for direct coolant contact. This allows you to custom set each speed setting to a precise temperature set point for your car. Starting and fan speed ramp-up should be smooth if starting at a lower speed.  Of course you may instead use screw-in temp senders mounted somewhere, such as the radiator or engine, however I don't know of any that are adjustable.

4-Speed Relay Function Theory
I have designed this to allow the fan to remain off until your low temp set point is reached and the sensor activates power to the low speed relay (Relay 4).  In theory this low speed could be used to maintain cooling at idle with minimum fan use.

When your temperature climbs a little higher, the second sensor will activate the next relay (Relay 3), automatically cutting power to the lower speed relay.  This way only ONE CIRCUIT will be powered at a time. This function works for each relay in succession as temperatures rise and increased fan speed is required.
Why Four Speeds?
Why not?  I know two speeds is definitely not enough for a Mark VIII fan, because the full speed is overkill most of the time.  Three speeds might be ok and the above diagram can easily be adjusted to make it into a 3-speed controller
by simply eliminating relay #4.  Four speeds just seemed about right to me.  Heck, you can even build a 5-speed harness using these components by adding just one more relay.  But I chose to do four speeds.

The amperage capacity for the high speed relay (Relay 1) will depend on the fan you use. Most 15 inch or smaller fans (such as Volvo 960, 850, S80) can get by with a 40A relay for the high speed, however I suggest at least 50A.  A larger fan, such as the 17-18 inch Ford Taurus/T-Bird/Lincoln Mk VIII fans, should use a 70 or 80A relay. These big fans can pull 40 amps continuously at full power, so power and ground cables for these fans should be fat, such as 8-10 GA (I'm using 8 GA).

The 8 and 10 GA cables I'm using for my project are high-flex fine strand type. Cables in 8 gauge and larger can usually be found sold as welding cable. I found them sold in reasonably short lengths in Amazon so you don't need to buy them in large spools. Fine strand cable has much finer strands than common automotive cable. I'm willing to pay a liitle extra because I've grown tired of dealing with stiff, large strand cable that's hard to form and breaks easier after years of long-term vibration.

<<< Here's a Wire gauge Guide that you may find useful.  If you pay close attention, I think you'll find I used larger cables than required. That's ok in my book.

This relay is not shown in the four speed diagram above. This optional relay will override all other relays (except for the full power relay operated by an override switch). Since my preference was NOT to use 100% speed for the AC, my idea was to wire this relay to the "HIGH" relay, which actually runs below full power (this turned out to be 77% in my case).

The 12V switched wire at terminal 85 gets connected to the power wire that activates your AC compressor. 
NOTE: Or if you have an '84 to '89 Volvo 240 you may use the AC power 'ON' wire, which is the Red/White wire going to the AC microswitch (attached to the AC knob switch in the center dash).


Mini ISO Relays used for this project:
1. Full Power 100%: SPDT rated at 80 amps.
2. High: SPDT rated at 40 amps.
3. Medium: SPDT rated at 40 amps.
4. Low: SPDT or SPST rated at 40 amps.
5. AC: SPDT or SPST rated at 15 to 40 amps.

Mini ISO Relay Connections (View from bottom of relay or bottom of connector plug)
SPST (Single Pole, Single Throw): This type relay will have an 87b center pole.
SPDT (Single Pole, Double Throw): This type relay will have an 87a center pole.
30: Constant 12V (battery), unswitched
85: Signal, 12V switched (fuse panel)
86: Ground (completes coil circuit to close connection)
87: Consumer 12V (to fan or other device to be powered)
87b: Extra consumer (same as 87)
87a: Opposite of 87 (changeover relay only)

SPST vs SPDT Relays.  What’s the difference?
Single Pole, Single Throw (SPST): This relay will be identified as having a middle 87b spade (or no middle spade at all).  This is the most common relay used for fog lights or other simple circuits. If there is a middle 87b pin, that pin will have power whenever there is power to the 87 pin (whenever the relay is “activated”).  This way the middle 87b pin may simply be used as an extra power output.

Single Pole, Double Throw (SPDT): If you have a relay with an 87a pin in the middle spot, it's an SPDT relay, also called a "changeover relay."   In a changeover relay, the 87a pin will be “HOT” anytime the 87 pin is "OFF," so long as the relay is connected to power. So when 87 is "OFF", 87a will be "ON".  When 87 turns "ON", 87a will turn "OFF". 

<<<  The Hayden 3653 adjustable temperature probe sensor pictured here can be purchased from Amazon or Summit Racing for about $20 each.  It's only rated at 16 amps, so it really should not be used for a fan without a relay.  This mechanical sensor may be used to trigger a 12V circuit or ground circuit, either one.  For my project I chose ground circuits.  The male terminals on the side are typical .250 inch (6.3 mm).  According to Hayden, the temperature range is 32°F to 248°F (0°C to 120°C). Turning the trim pot clockwise increases the temperature set point; counter-clockwise decreases it. The kit comes with a mounting bracket for the unit, some screws, some .250 inch insulated terminals, some wire and some mounting parts for the radiator probe. 

I have noticed at least one fan controller company ridiculing anyone using one of these in a car.  The thing is, it's SIMPLE and SIMPLE THINGS FAIL LESS in my experience.  Complicated fan controllers don't have the same track record, so I wouldn't say much if I were them.

Dimensions for this item are about 2 x 1.4 x 1.2 inches (51 x 36 x 30 mm).


<<< The resistor board for this project can be a simple auto AC/heater fan resistor. The one I chose is Dorman 973-018 for 1990-96 Chrysler/Dodge (4-speed fan). It's easily found on-line. Cost is under $10.00. This is designed to use .250 inch (6.3 mm) female crimp terminals, but I found that .312 (7.9 mm) female terminals are a better fit and they have a much better (larger) contact surface.  I just happened to have those on-hand. Better contact is good, since I'm using 10 gauge wire here. 
<<< This resistor board offers four speeds to choose from. I am only using three of them (plus a full power relay for the fourth/full speed).  I measured the resistance values for each circuit on this board and included those below. There are more testing results further below also.
Dorman 973-018 Pinouts
1.  Input: High Speed
2.  Input: Medium 2
3.  Input: Medium 1
4.  Input: Low
5:  Output to fan

Resistance Values
0.3 Ohms
0.8 Ohms
1.4 Ohms
3.1 Ohms

Yes, the resistor coils can theoretically get hot when this circuit board is in use.
It would be best to place this thing where your fingers won't be tempted to touch it.

<<< I mounted mine in the lower left fan shroud. 

I have taken temp readings from this resistor board when the fan is running and have found it so far to be not much higher than the shroud ambient or radiator ambient temperature.

To those of you who cried out that this resistor board would melt, sorry, but you were wrong.


It was important to me to see this work and get some good test results for this build before I committed to installing it in my car.  It needed to actually work as expected. So I built a bench-test version with all the components shown so I could get some real performance measurements. 
It's important to keep in mind that the fan controller was tested in my car with the a fan fully installed. It was mounted to my radiator with an intercooler and AC condenser in front of it.  I felt that if testring was done on a bench, the fan would likely pull less amperage with higher RPMs. That would not be very realistic.

This test was done with the engine OFF, so the battery voltage was not as high as it would be if the engine was running.
Lincoln Mark VIII Fan Speed/Current Testing (static 12.7v battery with engine off).
Dorman 973-018 4-speed resistor pinouts shown below.
Resistor Pinout
RPM (Percent)
Amps Peak Spike/Constant Current
Fan full power
1800 (100%)
1. High
1400 (77%)
2. Medium 2
1000 (55%)
3. Medium 1
  650 (36%)
4. Low
  470 (26%)
**Peak spike amps measured when ramping from 77% to 100%. Ramp up from zero to 100% was not recorded.
My first suprise was seeing how the HIGH power circuit on this resistor pack produced a number so much lower than 100%. That's not a disappointment, since it offered an opportunity for an extra speed choice below 100%.  Using these speed figures, you can decide which circuits you want to use for the fan speeds you like.  The 26% speed might seem ok on paper for a low speed, but once I saw how slow that actually ran the fan, I felt differently. You can see in the diagram up near the top of the page I listed the 26% for my LOW speed. The reality was that was not going to happen. So I decided to change it to the four speeds shown below.   

LOW:                           36%
MEDIUM:                     55%
HIGH:                           77%
FULL POWER:          100%  (only used with override switch)
AC engagement activates the 77% speed.
Another test was done after the full installation of the controller. This time with the engine running and alternator charging (voltage readings below).
Since the 26% speed was not used, it was not measured here.  I have a 188 degree F coolant thermostat in the car and the 36% speed seems to do very well to keep things nice and cool at idle on a warm 85 degree day. If the climate is warmer, then the medium 55% speed comes on occasionally.  Keep in mind that every car is different. My car has a very large aftermarket AC condenser (with dual fans) and an intercooler in front of the radiator. Those items obstruct the flow of air to the radiator a lot when compared to car without those items.  All cars are different. 
Resistor Pinout
Amps Constant Current @ Voltage
Fan full power
40 @13.3v
1. High
29 @13.6v
2. Medium
15.7 @13.9v
3. Low
8.6 @14v

Optional Items

Hella H84988001 Four Relay Sealed Box. Available on-line for about $40 to $50. Pricey, yes!  If you're concerned about moisture messing with relays or maybe you just want them to look nicer, this may be a solution. Keep in mind this box is NOT waterproof.  There is an o-ring sealed lid, but the bottom is not sealed at all.  NOTE: The high-current 80A (full-power) relay will NOT fit in this box, since it uses .375 inch terminals instead of small .250 inch terminals like standard relays.  This box holds only standard relays. The 90 degree mounting ears are removeable and supposedly you can connect two or more of these boxes together side by side.

I found an ABS project box to fit the three Hayden sensors and to help make this installation look nicer.  There are a lot of sizes out there for boxes in a couple colors, including black. This box is 4.7 inches long x 2.6 inches wide x 1.4 inches tall O.D. (found on Amazon).  I had to do some grinding on the inside to make everything fit inside. A larger box would have been easier, but I wanted it as compact as possible. Cost was about $6.00. The box was painted black before completion.

Had I found this larger box first >>> I probably would have chosen it instead: >>> https://www.polycase.com/lp-55p.  Its dimensions are 5 x 3.5 x 1.5 inches (127 x 88.9 x 38.1 mm). It would likely have been a better fit and I think with little or no carving.

<<< Ford Fan Motor Connector. Fits a variety of Ford/Lincoln/Mercury fans, including the Mark VIII fan I have. A google search will find them in a few places. I have only found them available with 12 gauge wire pigtails.  In my opinion that's a bit small for such a fan.  I used 8 gauge welding cable.

<<< Dorman Conduct-Tite Terminal, AKA: Ford Standard Block Technician Terminal. This is the type of terminal that goes into the Ford fan motor connector. Dorman offers PN 85367 which fits 14-16 gauge wire and is available on line. The 10-12 gauge version would be more appropriate, however so far it has NOT been found.  If anyone can help with any real sources, please contact me.

<<< So I improvised and sucessfully used the 14-16 gauge terminals since I couldn't find larger ones. I added one of my large terminal overcrimps to make a solid crimp over the 8 gauge cable I used.  Inserting this into the back of the Ford connector housing can be a little tight. I opened up the holes on the back of the connector to accommodate this fat cable.  If necessary, a little trimming of the inside of the housing with a hobby knife will help it go in and click.  Mine went in and clicked in place without an issue.

<<< PROPER CRIMP tools are important.  Try not to use too cheap a crimper or the wrong type for the terminal you're using.  Buy yourself something at least as good as this one. 
For those of you who are curious about what crimper I use, this is it for 90% of my crimps for non-insulated (and many insulated) terminals.  Thomas & Betts model WT 112M. It runs about $45. I've probably had this one for 20 years.  With some practice, this tool can create nice crimps just like a fancy tool.

<<< For a tool that's a bit more fancy, look for a ratcheting crimper that will do open barrel F type terminals.  You can spend a lot of money on one of these tools, but it you hunt carefully, you can find something like this one, which is only $31 for all that stuff.  The crimp type normally used for terminals I offer here is the die set in the center.  The others might come in handy, so they would be a bonus.  I don't own this one.  Mine was about $80 ten years ago. This one is cheap and might be worth the cost, or it might explode. You can never really tell until it's in your hands.
HERE: https://www.amazon.com/dp/B01CVH8JNO?psc=1

Here's a good crimping guide for beginners: http://www.xj4ever.com/crimping my style.pdf

Here's a decent video showing close-up crimping action for an open barrel terminal.

<<< This is an aluminum Chassis Mount Resistor.  It is NOT something I have tested or used in this project.  The reason this info is here is because It has been suggested for durability (particularly in corrosive or wetter environments) that some of you might consider a different style resistor instead of the Dorman resistor board I used.  Most of the suggestions people have sent have been pointing to ceramic automotive resistors, such as those used for ignition, AC and cooling fans in Euro cars.  The problem I encountered is that there are very few choices for varied resistance values in ceramic, so it may take a lot of trial and error to get that working well. 

So then I began looking at these Chassis Mount Resistors.  The dimensions for the models listed below are 65 x 47 x 26 mm (about 2.5 x 1.9 x 1.25 inches), they run about $10 each
and they're rated for WET CONDITIONS. Most cermamic resistors have only a 30-40 watt capacity. The chassis mount types I have listed below all have a 100 watt capacity. You would need three of them to come close to duplicating the three speeds I have achieved with the Dorman resistor board, however I have not tested any of these yet to see what speeds they will actually generate. Since the four ohm values I found in the Dorman resistor board were 0.3, 0.8, 1.4 and 3.1 (I'm only using 0.3, 0.8 and 1.4 ohms), you can try some that are reasonably close to that, such as 0.22, 1 and 1.5 ohms.   A source I found for these is DigiKey Electronics: http://www.digikey.com/product-search/en?keywords=resistor. 
PN A102367-ND  0.1 ohm
PN A102368-ND  0.22 ohm
PN A102369-ND  0.47 ohm
PN A102106-ND  1 ohm
PN A102185-ND  1.5 ohms
PN A102360-ND  2.2 ohms
PN A103830-ND  3 ohms

If you incorporate something like this in your build, please email me. I would like to know how your project goes.  CONTACT ME.

Completed Project
After over a year of use, this controller has worked perfectly. Zero glitches or worries. 
That's nice for a change.

<<< Here's the full setup installed in my 240. As you can see I opted for the fancy sealed Hella relay box.  Those four relays in the box are for AC, Low, Medium and High speed.

<<< Another angle.  That relay on the left side of the Hella box is the 80A full power relay. It's triggered by the override switch on my dash. Hopefully it won't be needed, but it comforts me to have it just in case. 

This setup has been road tested in 95 degree plus Texas climate and aside from a little fine tuning of temperature settings as I have encountered different climates, it works exceptional.  The 77% speed I chose for the AC works very well also.


<<< Here's another view of the Dorman resistor board mounted in the lower left corner of the fan shroud. 
That is 10 gauge high-flex wire. The terminals are .312 inch, since I found they fit better with more contact area than the .250 terminals that are supposed to fit on there. 

More than a year later and all is working perfectly.

This is worth mentioning if you decide to used the Hayden 3653 temp sensors. It concerns mounting the radiator fin probes on the radiator. This image is from their instructions. They supply the shown probe mounting parts and tell you to mount the probe in a supplied metal/rubber mounting strap that is then isolated from the radiator by a foam pad.  THIS IS A REALLY BAD IDEA.  What this does is delay radiator temps from quickly transmitting to the probe.  The delay with mounting it this way is substantial.  It has slightly less of an effect when hot air from the radiator is blowing through and past the probe, but there will be signiificant delay when warming up the engine if the car is not moving or moving slowly.  The delay will be such that the radiator will heat up PAST the setting you want for the fan to come on, so then it comes on late, and then it will DELAY the fan from shutting down as the radiator temps drop off, causing wide swings of the fan on/off cycle.  You'll curse Hayden because you wont be able to accurately dial in your settings. It's just bad. Don't do that.

<<< DO THIS: The probes that come with these units are a bit fat and would not slip into my radiator fins without a lot of force.  This may be why Hayden wrote those instructions that way.  I didn't want to risk damage to my expensive aluminum radiator by bending things, so I mounted the probes tightly against the radiator fins as shown in this photo using thin zip-ties. While it might be hard to tell in this photo, the full length of each probe is very snug against the radiator fins and they have good, solid contact. Sensor activation with this method is quick and accurate.  Faith in Hayden has been restored.

<<< Here's the override switch I placed on my dash. The small LED bulb below the switch illuminates green when the fan is on.

<<< The LED turned out to be too bright with full 12 volts, so I added a 220k ohm resistor to the power wire.  Now it seems just right.


The final speeds I chose have turned out very well.
LOW:                    36%
MEDIUM:              55%
HIGH:                    77%
FULL POWER:   100% (only used with override switch)
(AC activates at 77% speed)

Your comments are welcome. CONTACT ME


Update 2017: The dorman version of the Lincoln Mark VIII fan and shroud is available in Amazon here cheap: https://www.amazon.com/gp/product/B001SGHK1W/ref=pe_850140_225176060

(These are the parts I can remember. Some items are available in my Relay Page or Harness Parts Page if needed).

Relay - Picker High Current 80A relay (SPDT). Qty 1.          Available here:  http://www.240turbo.com/volvorelays.html#highcurrentrelay

Relay - Tyco gray “101” 40A relay (SPDT). Qty: 4.                Available here:  http://www.240turbo.com/volvorelays.html#1259926-101gray

Relay plug socket, interlocking, 5-pole. Qty: 4.                      Available here:  http://www.240turbo.com/volvorelays.html#relayplug

          Optional - Hella H84988001 Sealed Box for four relays. Qty: 1

Relay high-current plug socket, 5-pole. Qty: 1.                       Available here: http://www.240turbo.com/volvorelays.html#highcurrentplug

Fuse holder (mini fuse) with 5A fuse (18 gauge wire). Qty: 1

Fuse holder (maxi fuse) with 50A fuse (8 gauge wire). Qty: 1.

Hayden 3653 adjustable temp sensor. Qty: 3.

Resistor pack -  Dorman 973-018 4-speed fan resistor. Qty: 1.

Diode -  PN IN5408. Qty: 1.                       

Wire - 8 gauge (high flex welding cable recommended). Qty: about 8 feet red.

Wire - 10 gauge (high flex marine grade recommended). Qty: about 2 feet red.

Wire - 16-18 gauge auto primary wire. Red and black. Qty: about 8 feet red and black.

Heat-Shrink Tubing - Varies sizes (maybe 3/8 to 1/2 inch) in black or red and black.

Toggle Switch -  On/Off for high speed relay override wire. Dash mounted. Qty: 1.

Crimp terminal - .375" (9.5 mm) female, 6-10 gauge (for high-current relay). Qty: 3.               Available here:   http://www.240turbo.com/blackvinyl.html#.375inchterminals

Crimp terminal - .312" (7.9 mm) female straight, 10 gauge (for Dorman resistor). Qty: 4.      Available here:   http://www.240turbo.com/blackvinyl.html#headlightplugs

Terminal Overcrimp (optional) - Large (for Dorman resistor terminals using 10 gauge wire). Qty: 4.     Available here:  http://www.240turbo.com/blackvinyl.html#overcrimps

Crimp terminal - .250” (6.3 mm) female, 10-12 gauge (for relays). Qty: 7.                                 Available here:  http://www.240turbo.com/blackvinyl.html#.250inchplugs

Crimp terminal - .250” (6.3 mm) female, 14-18 gauge (for relays). Qty: 12.                               Available here:  http://www.240turbo.com/blackvinyl.html#.250inchplugs

Terminal Overcrimp - Large (used for Ford terminals in the fan motor connector). Qty: 2.         Available here:  http://www.240turbo.com/blackvinyl.html#overcrimps

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