Question about Ford Expedition
I've had the thermostat replaced, spark plugs and spark plug wires (someone said if sparks ain't right, engine could heat up quicker), and radiator flushed...and still over heats driving for long periods of time and especially going uphill or when a/c on. Also living in Samoa, the weather is usually hot and humid. Ben
Are your radiator fans working? When the AC is on, one fan should be running constant. When the engine is overheating, both should turn on.
There is no good way to check coolant circulation through the engine and radiator, but if you squeeze the upper radiator hose shut with engine running and the thermostat open, you might feel a pressure surge and a rush of coolant through the hose as you release it- kind of a rough way to check that the water pump is pushing the coolant through. Also you might consider a pressure test of the system to ensure it holds pressure. The radiator cap is what holds the pressure in the system- about 13-15 psi. (Wish I was in Samoa tonight-freezing cold here in Montana.)
Posted on Dec 06, 2014
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Posted on Jan 02, 2017
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