How long for the ac fan to start working? Ive noticed that the fan does not work when i turn the ac on, can this cause my car to overheat. I check the temp and coolant liquid both seems fine.

SOURCE: Radiator fan problem

Call up the dealer and ask what commands the fans to come on once the car reaches operating temp, on alot of imports, there is a fan control box of some sort that actually sends the sig to the fans to come on.

If it's the temp sensor and the computer tells the fans to come on you could be looking at a faulty computer.

This would deffinetly be worth taking to the dealer to diagnose so that you don't keep wasting your time and money chasing a ghost.

SOURCE: 2002 mazda millinia losing coolant out the overflow tank & overhe

Martin, You should replace your fan motor. One fan is for ac and one is for normal driving without ac. Your car is getting to hot. Hope this helps, these fans are available aftermarket as a whole assembly. Check out ebay I have seen them on there I have a wholesale company I buy them through.

SOURCE: 95 grand am radiator fan only runs with AC on

Cooling Fan Temp Sensor is the First thing You Check (with what you have described) Cooling Fan Should ALways come On When The A/C is turned On as A/C Adds A Load to Engine, If Temp Sensor is Faulty it Will Not Give GROUND Signal to ECM >For COOLING FAN >RELAY to Give ground and turn ON The Fan.
There ARE 2 temp Sensors that Serve Different Purposes 1 is for Dash READING GAGE & Or TEMP LIGHT the Other is For ECM or Fan Relay (SAME Thing) you Said>""can disconnect the sensor and fan continues to run" < This Leads me to think you Changed the Wrong One. Not Questioning your Skills Just Here to Help.
TEMP SENSOR FOR 3.1L V6 is Located upper RH rear of engine compartment, near exhaust system. Temp SENSOR for 2.3L Engine is Located in LH rear of engine compartment.
I Hope this Helps Lead you to a NON-OVERHEATING Pontiac.
Good Luck and Have A Great Evening. rejakwilson

SOURCE: 2001 Saturn SC1 Overheats when AC is turned on

Hello donezero,

Thank you for choosing fixya.com.

Try replacing the thermostat first. I see you mentioned that it overheats with the A/C on, while in neiborhood streets (or lower speeds). Also, with the vehicle parked, and the car running, raise the hood, and watch to see if the fans are coming on. If not, check the fuses in the fuse box. You may have a blown fuse. Examine both top and bottom radiator hoses to make sure there are no cracks, holes, or bubbles. If they look like they need replaced, replace them. Also, check the fuse and any relays that may be associated to the A/C pump - there should be one of each. By changing the thermostat, you eliminating it right away for being the reason of overheating. After diong all this, and the car still overheats under these circumstances, replace the temperature sensor, which is located on the intake manifol (usually close by the thermostat ) driver side of engine, toward front or center. (may be on passenger side, depending on engine). If this does not take care of the problem, consider a certified mechanic for further assistance.

I sincerely hope this information is helpful in getting your car (A/C) running properly. Let me know if I can be of further assistance in this matter. Thank you again for choosing fixya.com.

carsandcomps
Guru, fixya.com
Oregon

SOURCE: car overheat

The rad fan is required to keep your engine at a normal operating temp. When you are going at hiway speeds the fan is not needed. When you stop then the fan has to operate to keep the engine cool.If the fan is not operating, it could be the fuse or fan relay or temp sensor or computer This problem should be checked by someone who is a professional..