I've had the truck for nearly 5 years now, and around year two of ownership I began having problems with it over heating.. Oddly enough replacement of the thermostat fixes the problem, but I've gone through seven or eight in the past four years..
I honestly have no idea what would cause them to need replacement so often, but it usually happens when the weather changes, from spring to summer or fall to winter.
Any assistance would be most appreciative, thanks in advance.
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Re: 94 Ford 4.0L Thermostat Problem?
That's a strange problem.
Do your run antifreeze all year round? Or water in the summer and antifreeze in winter/fall?
One suggestion I can make is try replacing the thermostat with one of a lower temp. I believe OEM thermostat's for your truck open at 190 try using one that opens at 165 or so, less heat means less wear and tear. Either way you should not be eating up thermostat's like that.
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Go to the ford dealer with proof of ownership, and they should be able to help. They may charge though. I've had fair luck finding the security codes by googling the make model and year, but there's so many, that it's sometimes time consuming.
Any parts supplier will be able to look the battery up by application - Year, make, model and engine. Years ago there were 2 sizes - 24 and 27 with a Ford variation. Now there is a different application for nearly every vehicle.
The only way to replace the thermostat housing is by replacing the entire Intake Manifold. One of Fords wonderful design defects that they used for many years, in order to lighten the weight of the car. The intake manifold is made entirely of ABS (black plastic), while the replacement manifolds are made of ABS with the exception of the thermostat housing and this is made of Aluminum.
There was a class action lawsuit against Ford around 4-5 years ago, but for us that were unfortunate enough not to notified of such a problem, we end up getting stuck flipping the bill on our own. About 3 years ago when I had to replace mine, I had about $300 into the parts and a full days labor involved.
Its always a good idea to replace the thermostat housing every few years as they warp,if you dont have the extra cash you can remove the leaky one,and put the new thermostat in the block put a thin layer of good silicone around the stat,take another thin layer and apply it to the housing then you really dont need a gasket but you can still use one with this method,replacing the old bolts is a good idea also and that way you can tighten them correctly with no fear.have a good day DB