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Old 12-20-2015, 03:16 AM   #1
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2010 Focus Showing High Temperature

My sisters car is showing high temperature highest the gauge can go. the car looks fine, the rad fluid was low in the res but not empty. It doesn't look like it is over heating. Reading no fault codes, tried disconnecting battery for 5 mins, had the engine turn off for 20mins. but still showed max temperature on the gauge. Rad fan is always on, It blows warm, not really hot.

By my guess, I'm thinking thermostat replacement & rad flush. My sister is still driving it around.


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Old 12-20-2015, 06:15 AM   #2
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Does that car have a single remote reservoir or a radiator cap & overflow tank?

(can't remember which year of the MkII had which for sure)

Rad. cap type can be low & still have fluid in the overflow tank.

Test mode can show exact reported temps to confirm what's reported to the gauge. Hold the odo reset in while starting then page through the options to see temp..
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Old 12-20-2015, 03:43 PM   #3
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Test mode can show exact reported temps to confirm what's reported to the gauge. Hold the odo reset in while starting then page through the options to see temp..
it has two fill caps... I'll try that test

same one here:
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Old 12-20-2015, 11:19 PM   #4
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With that type you NEED to open the radiator cap & check there, system could be very low without you knowing it otherwise.
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Old 12-21-2015, 12:22 AM   #5
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Can also plug it in while it's warm to a scanner and get temps... might be easier.

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Old 12-21-2015, 05:44 AM   #6
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If you see ridiculous temps like 200C, then the temp sensor is bad. You can verify the actual temp of the engine by using an infrared thermometer pointed at the upper radiator hose if you know someone who has one.

If you are writing this because the instant that the engine is turned on, the temp rises to the max- then you can be certain it is the temp sensor. Typically, a bad temp sensor won't give a wrong reading until it reaches a certain temp, or it will do it intermittently while driving. In other words, the cold car will read correctly, however it is possible that it will go bad in such a way that it always shows high temps.

The thermostat and the temp sensor are different parts. The thermostat is a heat operated valve that restricts coolant flow through the radiator until the engine reaches operating temperature. On this car, it is not an easy part to change.
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Old 12-21-2015, 04:53 PM   #7
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If you see ridiculous temps like 200C, then the temp sensor is bad. You can verify the actual temp of the engine by using an infrared thermometer pointed at the upper radiator hose if you know someone who has one.
I guess I was right the first time, Sensor somewhere. Coolant Temperature Sensor... Cost of one?
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Old 12-22-2015, 12:41 AM   #8
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CHT (Cylinder Head Temp) sensor is in the center top of the head, between 2 & 3 plugs.

Just tell us you checked the coolant in the radiator to be safe!
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