Ford Probe

Why would a 1990 Ford Probe not give heat all the time or slightly overheat or will run normal with no heat then all of a sudden give out heat?


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2008-12-27 16:48:35
2008-12-27 16:48:35

You may be low of coolant in the radiator, causing the thermostat to burp through from time to time and also causing over heating of the car itself. Try filling the radiator with the blead valve open until no air comes out with the coolant. ------------------------------------------------------------------------------------------------- = Blend Door Problem = Your problem sounds like the common blend door problem on the Ford Expeditions, and Ford Explorer. The door is on a vertical axis and when it breaks, it can swing back and forth randomly giving heat or AC or nothing. The difference on acceleration is the force placed on the door swinging it one direction.

You can check the operation by fully opening the glove box, removing the actuator motor on top of the plenum box and examining the blend door axle. Pictures of the common fail signature are available on the web site. There are several "free" fixes that mostly are worth what you pay for them. The solution on the web site is solid and proven over hundreds of vehicles and will resolve the problem once and for all.


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The idle speed depends on the year model. The GTs from 1993 to 1995 should have idles speed between 650 and 800rpm. I believe the 1996 and 1997 models had a slightly different idle speed, but either way 1500 sounds too much. You can adjust idle speed on your car of course.

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