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I have a 1989 F150 with a 4" lift and 33x12.5 tires. Just this past wednsday, I noticed that the temp gauge started going up. Since then I have replaced the thermostat, fan clutch, water pump, and radiator cap. The radiator itself is less than 1 year old. I also changed the oil, replaced the fuel filter, and flushed the cooling system. I also cleaned all mud and debris from the radiator and the a/c condensor. I am at a loss for what else could be wrong. Any suggestions?
keep an eye on your coolant level if you are losing a lot and if you smell burning coolant you might need to have your intake manifold gasket replaced. You might also notice that your oil resembles a chocolate milkshake depending on the amount of coolant leaking into the engine. This is a well known chevy engine problem but not unheard of with Ford, I had it with my 1990 broncoII as well as with my 1995 Sierra.
I have a 1989 F150 with a 4" lift and 33x12.5 tires.
I may sound like the hall monitor here, but you should try posting this problem in the correct forum as well. May be some people there that would pinpoint this problem quicker