Question about 2000 Dodge Grand Caravan
There isn't an actual separate sensor for the cooling fans, instead the Engine Coolant Temperature [ECT] sensor sends a constant signal to the engine computer telling it the current coolant temp and the computer then decides when to close a relay which sends power to the cooling fan[s]. The cooling fans won't be on, even if the engine is running, unless either the a/c system is on and working or the coolant temperature reaches about 218 - 220 degrees at which point the cooling fans will be turned on and run until the coolant reaches a temperature of about 210 degrees and then it will turn off. If the a/c is on then the cooling fan[s] will be turned on and stay running to remove the heat from the a/c condensor all the while the a/c is left on. The fan[s] rarely come on at highway speeds because once the vehicle is over about 35 mph there is enough air being forced through the radiator to keep everything cool. If the fan won't work at all I usually check for a blown 30 amp fuse in the underhood fuse junction box or you could have a fan motor that has simply failed. Hope this helps a bit and good luck!
Posted on Aug 04, 2010
Testimonial: "Yes this was the answer, thank you Mike"
I have a 2000 that would overheat when a/c was on (computer tells fans to run high when a/c is on). It was the fan relay that was bad. It is located behind the drivers side headlight, I think you can get to it from the fender well. There is a round cap type that comes out so you can get back into there. It should be a black rectangular box with 1 connector plugged into it.
Hope this helps,
Posted on Aug 08, 2010
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Posted on Jan 02, 2017
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