The cooling fans wont turn on when they should and its causing antifreeze in my car to overheat causing my engine to overheat.

SOURCE: intrepid blowing fuses, causes cooling fans not to work, and A/C , overheats very fast

had this prob on my 93 intrepid. ur going to have to trace the wiring harness. takes alot of time, but it's worth it

SOURCE: 2002 Lincoln LS, V6 overheats

Did you purge the air out of the syst.? Also you replaced the fan but are they coming on? have you checked the fuses and relays? if all this is ok then is the computer comanding it on? Is the computer getting correct info from Eng coolant temp. snsr (ECT)

SOURCE: Cooling Fan not coming on 2002 Mitsubishi Galant

Check the fan itself for free turning--if it grinds or is hard to turn, replace the fan motor. The engine heat sensor reports temperature to the computer which turns on the relay and it turns on the fan motor. If you have A/C, turn it on--that should force the fan on all the time the car is running. If that works, then replace the sensor. If you don't have A/C, take a chance on the sensor--it's not too expensive. Wrap the threads with several turns of teflon tape when installing and don't over-tighten.

SOURCE: 1989 camaro cooling fan failure, how do i fix it

When was the last time the thermostat was changed , the fans are only supposed to come on before the temp gets to high if the fans come on when you turn the air conditioner on then it is not the fan.

Testimonial: "I have had the part for a while, the mechanic boyfriend says no, but i will do it while he is at work and see. Hopefully it will and he will eat crow."

Mark Carrington

• 192 Answers
• Posted on Jul 17, 2010

SOURCE: 98 deville 32 valve North Star OVERHEATS after 33

The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.
Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.