Cool/Heat: Fan wiring diagram

[jrlemke]

Could anyone post an after-market wiring diagram or a sketch of the cooling fan circuit? I am using a P.T. Cruiser two speed fan for my '61 Hawk. I will use the temp sensor to operate the low-speed and a manual switch for the hi-speed. I need the relay amps, etc. The factory calls for 30 amp fuse for lo, 40 amp for hi and 10 amp for control. Thanks- Jim.

[Mike Van Veghten]

All this took was a quick jaunt into the internet...!

http://www.justanswer.com/chrysler/240vf-need-wiring-diagram-2003-pt-cruiser-fan-motor.html

Mike

[SScopelli]

Saved



If you want the fans to ONLY run when the engine is running, you can add a oil pressure switch and another relay and supplement the circuit like this..



This is a helpful relay for many issues where you want electrical items on when the engine is running. (e.g. Electric Choke, fuel pumps, running light.)

[jrlemke]

I have the factory diagrams, I need to eliminate the PCM and the PDC

[bezhawk]

Here is what you need!

http://www.jegs.com/i/Derale/259/16778/10002/-1?CAWELAID=1710815432&CAGPSPN=pla&catargetid=230006180000848134&cadevice=c&gclid=CN3fi-fHscACFQxp7AodP0cAfA

[SScopelli]

You could also get one of these off eBay or your recycle yard.



Then use a dual thermal switch from VW, Audi or BMW


Wiring is self explanitory.. +12V in, the two wires from the thermal switch, and the two +12v out for the Hi/Lo fan speed..

I'm assuming you will have a bung put on your radiator for a thermal switch, but this is less than $50 and OEM quality

True CASO, just get three relays and the thermal dual Thermal switch. This set up will only provide voltage to one pole of the fan output.
When the High triggers it will de-energize the Low's relay



Click the icon for a bigger diagram

[Paul Keller]

have installed a 2000 Ford Focus dual fan on my '63 Hawk. Used two (2) Flex-o-lite temp sensors (the radiator probe type - they are a nuisance to route and protect from damage; your using a head mounted sensor is probably a better way to go) - Flex-o-lite has both probe and electric type sensors w/ full detailed wiring diagrams.
Your fusing looks about right. the focus fans draw a continuous 20 amps EACH and have a start -up draw of 30 amps EACH - Always fuse more than the draw - Then size the wiring to the fuse capacity.
A manula by pass switch is a good idea. I used a momentary 'ON' (it is for start-up booster use only) so as not to have to be concerned w/ a safety switch.

Paul TK

[bezhawk]

Some electric fans have up to 80 start up amps drawn. You need heavy wiring, and many times even a high output alternator. A stock Lark type alternator will not run most electric fans. (without eventual damage). A pulse width modulated fan controller gets rid of the high current spikes at their start up. They also vary the fan speed according to cooling needs.

http://www.stangtv.com/tech-stories/fuel-cooling-ignition-tech/derale-performance-pwm-electric-fan-controller-installation/

[jrlemke]

What year and model Volvo is the relay set out of and where in the car is it located? This looks like the best set-up for what I want.-Jim

[jrlemke]

What year and model Volvo is this relay set-up (attach. 37397) out of and where in the engine compartment is it located? It looks like what I want.- Jim

[SScopelli]

what year and model volvo is this relay set-up (attach. 37397) out of and where in the engine compartment is it located? It looks like what i want.- jim

1994-1997 volvo 850,s70,v70,c70,960,940 cooling fan 2 speed relay 1398845 oem

[jrlemke]

Thank you, now I gotta find one in the local junkyard. If it works, I'll get a new one.-Jim