Question about 1995 Ford Aerostar
I will take a wild guess here that you have a thermostat failure. First a little theory. Engines like to operate at the "right" temperature. Too cold and they are balky. Too hot and the oil thins out. The thermostat regulates the engine temperature by closing off the flow of coolant when the engine is cold, and increasing the flow of coolant when it is hot. It is a simple valve controlled by the temperature of the water flowing past it. Thermostats can fail open or closed. I think yours has failed open.
You can test this by removing the thermostat. It usually resides where the top hose of the radiator enters the engine block. There should be a fitting bolted to the block that has a roughly 2 inch dome on it. The thermostat lives under this dome. With a cold engine, remove the (usually) 2 bolts that hold the fitting to the engine and lift the thermostat out. You will loose some coolant, but don't sweat it. The thermostat is metal, looks wierd, and is about 2 inches by 3 inches or so. Drop it in a pot of cold water and insure it is closed. Bring the water to boiling and insure it opens up. If it passes these tests, you have other problems.
I personally would not bother to test the thermostat, I would just replace it. Also be sure to replace the gasket between the dome fitting and the block to prevent leaks. You will need to scrape the old gasket off; I find a 1 " wood chisel works well for this. Be sure both surfaces are clean for the new gasket. If you use gasket compound, use non-hardening for the benefit of the next poor guy that has to work on your engine.
Posted on Nov 06, 2012
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Posted on Jan 02, 2017
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