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dippinsoldier92 10-10-2013 11:56 PM

Hardwire cooling fan
What could I use to hard wire my cooling fan, so it will stay on whenever the engine is on. Its a 2007 3.7

dr.lee.baugh 10-11-2013 08:07 AM

Re: Hardwire cooling fan
Why would you want to do that? While there is some merit to doing such things on a track only vehicle, I can't imagine you are creating a track monster with the 3.7...

You may end up tripping coolant temperature DTCs (especially in the cooler months) as the fluid will not reach operating temperature along the same curve as it would if the fan was off, you will reduce fuel efficiency as the engine won't come up to operating temperature fast enough, and you are putting continual usage on a part that was only intended to run a portion of the operating cycle of the vehicle, reducing its useful life.

What do you hope to gain? If you want to run cooler, installing a different thermostat is a much easier way to go, and does not have the same issues listed above...

To answer your question, the fan of the 3.7 is simply an electric motor. Usually, if you remove the relay the fan will stay on (not completely sure about the circuit logic they use on the 3.7). Pull the relay out, if the fan doesn't stay on, you can just hard wire it in. You'll have to look at the wiring diagram to see the best place to do this...

korrupt_jeep 10-11-2013 09:11 AM

Re: Hardwire cooling fan
you are so right dr.lee:thumbsup:

bumnt 10-11-2013 01:55 PM

Re: Hardwire cooling fan
If you want to keep the engine cool, install a mechanical fan. I don't think the motors on the electric fans are designed to run constantly.

It'll cost you a bit in HP when locked...

I installed the heavy-duty towing package on my 09 4.7L and I swear the temps are dead where they should be, even in hot SC weather while towing and having the AC on.


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