Taurus Fan Volvo 2 Speed Relay How-To

Old 10-03-2015, 04:17 PM
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Default Taurus Fan Volvo 2 Speed Relay How-To

This is the budget setup to ensure the lowest cost up front and best
results for a Taurus 2 speed fan setup. Special thanks to Onovakind67 and
Aceshigh at NastyZ28.com for all of their work on this.

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#1. You need 2 temp switches for 2 speeds.
Solution = BMW 91 / 99* C (180/195*F) dual temp switch Part #61311378073< $12 from Rock Auto - can't beat that.
One single temp switch instead of 2, just gotta drill and tap a brass adapter fitting to accept the M14 x1.5 thread.

#2. Heavy duty controller for 2 speeds. (Thanks Onovakind67)
94-97 850 Volvo vehicles used a heavy duty relay dual fan controller part # 1398845

Cooling fan relay for any 960, 940 92-95, 850 all, 740 92, S/V90 all, S/V 70 98-00, C70 Turbo 98-04.

92-95 960 and 940
98-00 S/V 70
98-04 C70 Turbo
92 740
S/V 90 All
850 All

Volvo Controller = $10-$20 Salvage yard or ~$50 new.
BMW Dual Temp Switch = $11

Make sure your alternator can handle the load. I switched to a 144amp unit
144amp alternator
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Here's the simple schematic ,
You can optionally wire in 2 LED's so you know when each fan is on.

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You don't want to interrupt the main batt wire to the volvo relay with the ignition relay. because you have now limited your hi amp volvo relay to 30-40amps. you want to interrupt the ground wire on the temp sensor.
85 ground
86 ignition
30 ground
87 to temp switch ground
87a nothing

this will allow the volvo to stay connected to the full power of the battery, and turn the fans off when the key is off



Originally Posted by Turbo70Camaro
Okay guys/gals I have finally got all the parts with photos to help out further on this great thread.

#61318361787--BMW temp switch 180*/195*
#61311378073--BMW temp switch 195*/210*
#61131378412--BMW 90* angle connector
#61130007445--BMW 90* green connector wires 2 required
#61130007446--BMW 90* green/black connector wire for ground
#1398845--------VOLVO dual fan relay, sorry no info on connectors(YET) except for the wires coming out for the temp switch high/low. Mine were completely disintegrated so I ordered 2 new wire assemblies and stuck them in the old connector.
#3523813--------VOLVO white wire assembly for temp switch 2 required.







By the way the pack of aluminum washers is for the temp switch itself, my uncle who is a german car mechanic told me it is required to have an aluminum crush washer for leaks ? got it from local parts store for 3 bucks.

Brass hex head bushing, use for BMW temp sender. All you have to do is tap it with a 14mm x 1.5 tap. This brass fitting is short and no need to drill out just tap it.

Item #: 48938
HEX BUSHING 1/2X1/8"BRS


http://www.acefactorystore.com/prodd...asp?prod=48938
Originally Posted by clay's70
Recap of my set up:

Stock radiator (new)
2 gals antifreeze + 2 gals water
Water Wetter

160* thermostat
BMW 195*/210* temp switch
Volvo Relay
2 speed Taurus fan

140 amp alternator

Finally fired up the motor. After timing I let it idle at 1500 rpm for 30 min. The thermostat opened at 160*, the fan kicked in at 195* the temp actually dropped and the fan cut off!! It cycled several times this way. Temp never went over 200*. High speed never cut on. This was in my garage 50*+ day. The alt. kept steady and the lights did not dim.

Originally Posted by clay's70
Using Ace's diagram I wired up the power outlet, cooling fan manual switch and the LEDs.

Low speed on
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High speed on :crazy:
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Originally Posted by clay's70
I found the bracket on a S10 firewall, I'm sure other Chevy's use the same bracket. I cut off one of the brackets.




I cut with the Dremel the lock tabs and the ears off of two brackets.


The brackets line up with the Volvo relay perfectly!! And lock on. You have another mount for the relay to switch the negative lead from the temp. sender.


Front view.


I drilled another hole in the right side. and painted it.

Here it's mounted up



Originally Posted by Aceshigh
Be sure and check your T1 and T2 wires which should be LOW and HIGH settings are wired to the Volvo relay.
Then be sure the 3rd wire from the Temp Switch is grounded properly.
Relays for sale

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http://www.ebay.com/itm/Volvo-2-Spee...-/321848927764

LEDs low speed
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High speed
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complete setup mounted without fenders
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close up of completed relay mounted
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bung in rad
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Old 10-11-2015, 08:29 AM
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Another way of mounting the relay and temp switch.
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Old 10-11-2015, 09:36 AM
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Here is a link to how I did mine. https://www.cherokeeforum.com/f5/fin...nstall-195441/

Max
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Old 01-24-2016, 05:50 AM
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Bushing for the BMW temp switch. 1/2 MIP x 14MM female.
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https://www.ebay.com.au/itm/BMW-Temp...75.c100623.m-1

Last edited by DoubleAughtGC; 04-08-2018 at 04:58 AM.
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Old 01-25-2016, 02:30 PM
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IMO it hangs too far below the stock XJ radiator to be efficient. I've used one and I was more happy with my triple 10" fan setup
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Old 01-25-2016, 11:40 PM
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i put my fan in the xj shroud, took some trimming but it fit nicely

Taurus Fan Volvo 2 Speed Relay How-To-2014-12-01-14.19.25.jpg

i screwed up the trimming a bit but it still works

Taurus Fan Volvo 2 Speed Relay How-To-2014-12-01-14.19.45.jpg
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Old 04-08-2018, 05:08 AM
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Old 02-04-2019, 07:55 PM
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Originally Posted by DoubleAughtGC View Post
Bushing for the BMW temp switch. 1/2 MIP x 14MM female.
Attachment 310711

Attachment 310712


https://www.ebay.com.au/itm/BMW-Temp...75.c100623.m-1
yes i know old thread.


anyone think i could do this with a dual fan setup? Usinng all the same psrt numbers and methods of wiring, except using a dual fan (one fan wired to low, and one fan wired to high)? Im not sure how the valvo relay works exactly. Im guessing one lead goes HOT at a temp and then at another lead goes hot at another temp based on the temp sender gauge leads.
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Old 02-12-2019, 08:04 PM
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Might be an old thread, but nobody ever noticed the wire diagram in the OP is wrong. 86 and 30 should be swapped.

I put dual Taurus fans on my DMAX. Works great. I just used two cheap "push in" type adjustable thermo switches, and 5 Bosch style relays. Don't forget to integrate the compressor clutch wire (and a diode) so the fan comes on with the A/C..
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Old 05-13-2019, 03:09 PM
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Originally Posted by DoubleAughtGC View Post
Another way of mounting the relay and temp switch.
Attachment 312411

Where do you find the single stand alone relay? Already have the controller.
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