Ford Trucks and SUVs
Ford F-150

How do you replace a thermostat in a 1978 Ford F150?

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Wiki User
03/14/2013

if you look from the front of the truck there is a hose that goes from the radiator to the engine. take off that top hose, then if you look on the engine section where the hose connects there are two 1/2 inch bolts that you'll need to loosen and take off (i suggest that you grab a bucket and put it under the truck so that you can catch all of the coolant that will most likely spill) now after you loosen the bolts you will see a circular object that you can pull out. (that is the thermostat) take it to the auto store and replace it. be care when you put it in because there should be threads to fit it in. after you get it in put all of the pieces back together in reverse order of how you took it apart