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Old 01-25-2013, 06:18 PM   #1
doochild
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2009 intermittant heating problems

I drive a 2009 Focus SEL and am having intermittant heating problems.

About once a week I don't get much heat through the car even though the temperature gauge is in the middle. It doesn't blow cold air but it's not as warm as it can be and doesn't seem to be related to outside temperature. The car is higher mileage so I changed the coolant and the thermostat. The system is bled properly.

There are no fault codes in any of the modules and the blend door is working properly each time I check it. The only possible cause I can find is in the heating module. It shows 'Engine Coolant Temp Gauge (degreesC) 500'. I don't know what this means. I know there is a cylinder head temperature sensor and it is reading correctly but I can't find a coolant temperature sensor which I would expect to find in the engine block. Does this car have one?

I would appreciate any help to clear this up and any information on this cooling system in general.


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Old 01-25-2013, 07:56 PM   #2
sailor
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Blend door issues are the MOST common cause of your issue, IF you can confirm that the door is in the proper position when you don't get proper heat the next check would be to backflush the heater core to remove any "crud" that may be intermittently blocking it.

Checking for decent flow when you do it....

A cheap infrared thermometer would help confirm the heating issue quickly, failing that I've had good luck checking A/C operation by just putting a small kitchen (cooking) thermometer in a dash vent. That would give you some numbers to work from that would confirm things better than how it "feels", since varying outside temps have a LARGE effect on subjective estimates of temperature....

Luck!
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Old 01-27-2013, 02:36 PM   #3
doochild
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thanks, I have an infrared thermometer and a small dash thermometer so will take some readings.

I'm still not sure if there is a coolant temperature sensor on this engine or why something is reading 500 dergees Celcius but would quite like to get to the bottom of that too.
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