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Old 02-06-2019, 11:40 AM   #11
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I have a 2010 I believe you only have one cooling fan. If it's running its butt off while you're sitting in your driveway and it's overheating I would say you probably have a flow issue. Could be a restricted thermostat, a dying water pump, a clogged radiator. The number one reason why cars overheat in a standstill is because the fan is not drawing air flow over the radiator, but you are saying the fan is running. I wouldn't consider that gauge a dummy gauge it definitely has some movement in it.

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Old 02-06-2019, 01:30 PM   #12
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Check the cooling fan resistor and connector. If the resistor is bad the low speed of fan won’t work. The connectors are prone to become melted from over current. You can replace the connector and resistor, but the whole fan assembly is pretty reasonable aftermarket.
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Old 02-06-2019, 06:31 PM   #13
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The single fan if only one can overheat if only at high speed, they have two speeds and if the low does not come on per the above post then high fan will come on but takes a while to pull the gauge back from overheat. How seeing fans running may mean nothing, they came on too late after engine temperature control was lost. You have to be able to discern low vs. high speed as well.

I don't believe the a/c switches off to allow heat only either, that one would require the PCM to control the temp air doors and thinking it does NOT. Somebody would have to show me a schematic showing that. The heater core is likely like all the rest and never cuts off anyway. Suddenly blowing fully hot air on a customer in the middle of summer heat is a whopping good way to spread the word not to buy THAT car. Imagine what the salespeople would say, and without 4 letter words. You can literally kill an older person in a very few minutes doing that if they have a weak heart, and I'm sure the Ford lawyers know that. Not to mention I destroy the entire idea by simply switching the HVAC blower OFF. The idea is unworkable.
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Old 02-06-2019, 07:05 PM   #14
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A/C cuts out via the high pressure in system from insufficient air flow across condenser. I believe all A/C equipped have dual fan systems and still use resistor for low speed operation of cooling fan. The high speed relay is merely wired to bypass resistor by shorting across it. If you put a large enough wire across terminals of resistor connector fan will run at high speed and that will tell you if idling in traffic problem is on the low speed side. At this point once you fix that issue I would still go ahead and replace the thermostat just because it has overheated
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Old 02-06-2019, 08:59 PM   #15
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'A/C cuts out via the high pressure in system from insufficient air flow across condenser.'

YES, it does do that but the a/c will still be on at main switch, it just doesn't cool. That does not open the heater duct to let heat in though.

It does the same if say the orifice is very close to clogged, the extra load on a hot day then does it. The car will try to push into an overheat, I've fixed before by simply yanking and cleaning the orifice.

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Old 02-07-2019, 11:50 AM   #16
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He said car had a lot of miles/kms on, could this overheating be caused by something simple like a water pump going out? Worn fins?
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