Question about 2001 Toyota Corolla

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Cooling fan the fan keeps runingi took out the relay to stop it svb

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  • svbgemsgrani Oct 16, 2008

    i did change the relay.something else.



    svb

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Many times the relay contacts for engine cooling fan motors burn togeather (fans draw allot of amps) and the fan will no shut off, I would recommend you replace the fan relay, I think that will cure the problem.

Posted on Oct 16, 2008

  • yadayada
    yadayada Oct 16, 2008

    When asking a question please provide all repair info, that way I can assist you in a more efficient way. Next thing to check is the engine temp sender that controls when the fan turns on, cooling fans turn on by default whenever a part fails in the system, the reason to keep the engine from being damaged. Check that sensor, also give me a heads up on any other repairs you have attempted to correct this problem. Thanks

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My ac is not working I have a Chevy Tahoe 2005 the fans won't turn on either .


Hi Maria , The A/C system wouldn't keep the fans from running but none working cooling fans will keep the A/C from working ! This is a fairly complex system if your not familiar with this sort of thing ! I will add the description from the factory service manual.
Cooling Fan Control - Two Fan System
The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the powertrain control module (PCM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block.
During low speed operation, the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the low fan fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the cooling fan s/p relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3 second delay, the PCM supplies a ground path for the high speed fan relay and the cooling fan s/p relay through the high speed cooling fan relay control circuit. This energizes the cooling fan s/p relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the high speed fan relay coil is energized closing the relay contacts and provides battery positive voltage from the high fan fuse on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.
Do you have a check engine light lit ? The thing to do would have it check at the dealer or a ASE certified repair facility ! They could hook up a advanced scan tool an diagnose fairly quick ! Or you could find a wiring diagram an try testing with a volt meter yourself ! But watch yourself so you don't short out the PCM - engine computer !

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1 Answer

2001 ford escort cooling fan will not turn off please help?


sounds like either the temperature sensor is keeping it on, the cooling fan relay is fused together, or that you have some wires touching keeping power to the fan.

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1 Answer

Fan intermittently stops


If undercover surveillance people with electronic weapons are aiming at the front of your car, they might be turning off the fan. Maybe a relay is going bad. There are two or three relays involved. If that is the cooling fan for the A/C, don't run the A/C or it might burn up. I've had to lift the hood to look to see if the cooling fan was going. When my fan eventually got frozen, the hose to the radiator blew up and took the nozzle to the radiator with it. Big expense, new radiator, water pump, cooling fan, relays.

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A STUCK CLOSED COOLING FAN RELAY WILL CAUSE FAN TO KEEP RUNNING.REPLACE COOLING FAN RELAY.

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Radiator Fan Stays On


A simple test would involve disconnecting the fan switch while the fan is on. If the fan then stops the switch has failed. If the fan continues to run remove the relay , if the fan then stops the relay has failed.
Various inputs/outputs at the relay should be confirmed to be 100% certain something strange isn't going on.
Above all be careful of the fan itself , if it's running obviously but if it's not it could start during repair

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check your sensor that controls the cooling fans.may need to be replaced.

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1 Answer

Took through the mountains in Oregon into California when stop for the night the fan ran and would not stop--disconnected for the night now the vehicle is overheating is this the radiator fan relay and...


the fan is designed to run after you stop to cool the engine. Leave it connected. It has 2 speeds, low & hi. Operated by 2 relays in black box under hood. Fan runs as temp climbs or when a/c compressor is running.

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3 Answers

Cooling fan


i would deff check the relay i had a problem with my relay going out on my 04 but i just ran my fan to a togle switch so i can turn it on and off when i want it on when im in dead stop situations like traffic and also when your ac is on the fan has to be on or your ac will cut on and off to keep your car from really over heating in a hurry if your not moving, but i also run my car at the track and it helps to keep it cooler when racing down the drag strip.

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