Having problems with your Ford Focus ?

2005 focus overheating at speeds greater than 45 mph. Does not overheat at idle. Gauge goes back to normal immediately when speed is reduced. Radiator, thermostat, coolant reservoir and sensor have been replaced. No change at all.

Posted / edited by AnonymousUser on : 18-03-2019

Answers :

If the needle goes back to normal immediately upon reduced engine speed, then I would think it was linked to the temperature gage and not actually overheating. If the engine was overheating, it would take several minutes for the needle to show a drop in temperature. If it is indeed overheating there should be check engine light on the dash and the computer would store a trouble code. Have the computer scanned for codes to see if it indicates an overheating problem.

It sounds like there is air in the system, also worth noteing that thermostas can be faulty at any time even when new so might be worth rechecking that, I remoe it and then place the thermostat in a pan of boiling water if you see it open easily then at least you can rule this out. also is the water temp sensor clean, or the part where it sits into the engine is that clean?

Finally the only other thing is air in the system, did you have the system bled through after the new parts where fitted? and the only other thing I can think of is the fan is starting to fail, they can overcharge at higher revs or at higher speeds so then the fan cuts out or slows down thus not creating the correct amount of cool air. you can test this with a amp meter, worth checking all connections also from and to the battery and the fan itself. It is quite common on fords this fan issue.

ohh there is one more thing, there is a heater control module that sits dierctly behind the dash board in the centre, you can see this from the engine bay again in the centre has 2 pipes one in and one out, this is for the cabin heating that feeds to the heater matrix, these alwyas fail and can cause the heated water to stop at the cabin end and return to the engine thus cauing overheating, this is rare that it would do this but it is just another possibility for you.

Hope this helps.

Dan. p.s I would check the fan first!!!
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