Question about 2000 Ford Focus

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The radiator cooling fans start up soon after the engine is started and stay on - any ideas?

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Someone has wired the fan to stay on with the key on.....the coolant temp sensor is the culprit in most cases replace it.

Posted on Oct 10, 2010

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Bad relay switch

Posted on Oct 10, 2010

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1 Answer

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.


the ac fan starts as soon as the ac is switched on
the fan is provide cooling of the condenser before the radiator to prevent high head pressures in the ac compressor
it is the fan at the front of the car mand does not affect engine temp
there is a radiator fan between the engine and the radiator that will not start until the coolant temperature reaches a set temp at which point the ECM switches that fan on
if that fan is not working when the engine is hot , check for fan, coolant temperature sensor switch , fan relay, fuses or problem ECM

Jan 13, 2016 | AC Cars & Trucks

1 Answer

Compressor Clutch disengages and Radiator Fan starts to run loudly


The radiator fan should turn on when the a/c clutch engages as this is designed to increase the cooling of the engine as the a/c increases the engine loading. But the compressor clutch should stay engaged as long as there is need for cooling, and disengage/re-engage as the temperature control calls for cool air. The radiator fan will shut off IF the engine temperature is cool enough to do so, as it is regulated by heat, as well as the A/c override.

If your air conditioning is not cooling the car and the clutch is simply disengaging prematurely, have the temperature control and relay checked for proper operation. Also have the refrigerant level checked to assure there is adequate refrigerant in the system and no leaks. My first bet would be the relay or the thermostatic temperature control under the dash.

Jun 14, 2014 | 2006 Chrysler Crossfire

1 Answer

My heater, when parked and idle, cools down. The heater will heat again once I begin driving, but this is freezing me as I sit and wait for my kids at school. It blows cool air while I am parked and will...


It could be the electric fan is going on too easily.
The radiator and hoses should be almost too hot to touch.
And when cold, the fan should not really do on at all.
But the thermostat could be opening too soon also.
There are two hoses to the radiator, and when you start a cold car, only one should slowly get hot.
The other should stay cold until the thermostat opens, after the engine is good and hot.
If both start slowly getting warm at the same time, then you need a new thermostat.
And also make sure you have enough coolant in the radiator.

Dec 20, 2010 | 2007 Chevrolet Impala LS Sedan New Cars

3 Answers

I have 2003 grand cherokee with 140000 miles that overheats at idle. as soon as i start moving again, the temp goes back to normal.


You have two fan's on your truck, 1 is a fan clutch runs with the drive belt, 2 elec fan motor, with test light and engine running at normal temp, just a little bit above 1/2 way on your temp gauge check voltage at elec. cooling fan harness if you have voltage at one of the two wire's and fan don't turn on, bad cooling fan motor, on the fan clutch after you check voltage at elec. fan motor turn engine off, with your hand spin drive belt fan if it spin's freely bad fan clutch, replace it.Also check cooling level.Hope this was very helpful

Jan 21, 2010 | 2006 Jeep Commander

1 Answer

1997 ford explorer overheating but no gurgling and cools back down when heater is turned on . not loosing any coolant. does not seem to do it at idle but as soon as you start moving it goes up and when it...


Make sure the cooling fans are working when the engine reaches above normal temp,if they are not ,turn the ac on,and see if the cooling fans come on,if so,replace the coolant temp sensor,if it has a clutch fan,then replace it,for it is not staying engaged ,and is not turning fast enough to cool the radiator.

Nov 29, 2009 | 1997 Ford Explorer AWD

2 Answers

Why is my engin cooling fan staying on?


check and replace the engine cooling fan relay, refer to the owners manual for location under the hood.

Sep 27, 2009 | 2004 Mitsubishi Endeavor

2 Answers

Radiator fan runs when engine is off


some cars do start up the fan when turned off after they have been driven. as long as it is not starting when the engine is cold there is nothing to worry about. the reason it took 15 mins to shut off is that with the engine not running the water is not being pumped
round the engine thus cooling faster. hope this helps

Apr 24, 2009 | 2001 Chrysler Town & Country

1 Answer

A fan stays on after i turn my ignition off.


it sounds like you have a bad relay in your cooling fan and you may have to replace it

Mar 07, 2009 | 2001 Dodge Dakota

2 Answers

1989 mazda rx7 turbo over heating


Hi and welcome to FixYa,

A couple of ideas you may want to explore:
  • the engine overheating after a shutdown could perhaps be addressed by installing a time delay off on the relay of the radiator fan. The idea is after absence of Ignition B+12 (engine off), the fan/relay should still be energized for a number of minutes so as to cool the radiator;
  • idling the engine for about 5 minutes before shutdown is a good practice. this enable the engine to cool slowly rather than an abrupt change in temperature of the external but the inside is still rather hot;
  • the opening of the thermostat is triggered by the temperature of the water above it not below (where the spring is);
  • in my country, where it is relatively always hot, some mechs remove the thermostat (of course not applicable in cold climates);
  • a more helpful idea would be the installation of an electric water pump in lieu of the mechanical one. There are several after market models. Pls try here, here or here for a start;
  • it is also possible to wire the electric water pump to still run for a minute or more similar to the proposed time delay for the radiator fan above.

Good luck and Thank you for using FixYa. Happy Holidays.

Dec 07, 2008 | 1989 Mazda RX-7

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