Question about 2003 Ford Focus

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My 2003 ford focus stalls out when i turn on the defroster or the air. the fan never comes on to cool the engine. we tried to find the temp sensor but we couldnt find where its located

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You may have a locked up compressor. The fan only comes on when temp reaches 225 on high speed. Your low speed fan operation is controlled by the resistor that is between the two fans at the top. The connector usually melts and you will need to get two heavy duty female spade connectors to repair it.

Posted on Jan 04, 2011

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Posted on Jan 02, 2017

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I think yu have air trapped in the system. You need to burp the air. Try leaving the cap loose and running till it warms up, then tighten the cap and keep the reservoir full.

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I HAVE A 2003 TIBURON WITH A NEW RADIATOR. THE CAR HAS A TENDENCY TO INCREASE IN TEMP IF ON A CONSTANT SPEED OF 140KM. IF THE SPEED IS DROPPED TO 100KM THEN THE TEMP DROPS TO THE NORMAL OPERATING TEMP...


My guess is trapped air in the cooling system. If the cooling system was just filled with antifreeze without bleeding the air, it could cause sporadic overheating. It could also be the cooling fan not coming on at high speeds. Next time the temperature rises, turn on the defroster for th front windshield. That should cause the air conditioner to come on, which in turn will turn on the cooling fan. If the temperature drops, I would suspect the cooling fan sensor is faulty.

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Hi there. 2002 Petrol Ford Focus Zetec 1,6lt Automatic . Radiator was boiling over and the cooling fan is not engaging. I have checked thermostat, fuses etc and all seems fine. The local garage here in...


I have the U S wiring book. It may be similar to European version. I will look at work and see. Does the cooling fan come on when you turn on the a/c and the compressor clutch? The fan should cycle with the a/c clutch. Also, do you have 12 volts at the motor connection when the car is hot? There should be a big fuse in the box under the hood and probably a relay.
ALso, the ECT, engine coolant temp sensor on the engine should also tell the computer to turn on the fan when the coolant hits a certain temp.

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2003 ford focus zetec 2.0 fans wont come on unless a/c is on. where is the temp sensor or fan switch?


The cooling fans are controled by the engine computer, they are not directly controled by a sensor or switch. If the fans are not energizing you will need to have a scanner to test the electronics to determine why the fans do not come on. However if you turn the a/c on the fans should energize and you could test for power at the fan if power is present then the fan has failed. Please rate this answer this will help me out Thankyou RJ

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1992 Ford Taurus with a 3.8l V6 the cooling fan


The Taurus has Two temp sensors. One for the dash, which is isolated, then one for the PCM, it also controls when the fan relay should actuate. Its a 2 wire sensor, just above the thermostat. If you remove the harness from that sensor, and the cooling fan comes on, at any temp, (should take 5- 10 seconds) then thats your fault.

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1 Answer

2001 ford focus


the cooling fan will always come on when using the a/c,so it is not a fan problem,sounds like the pcm is not getting a signal to turn cooling fan on,could be coolant temp sensor.

Nov 01, 2008 | 2004 Ford Focus

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