1993 Ford Escort 1.9 Liter engine.
I am wondering how to check operation of thermostat housing on my escort. IT takes too long to warm up and heat is only sub-par. Considering the thermostat is seated and working properly I have concluded the bypass vapor vialve in the housing is not working and allowing too much coolant to pass.
Should it be plugged in the holes or should it be unplugged. When I invert it (off the vehicle) a plunger moves back and forth. I can hear the rattle and actually see it move. I was told that there was supposed to be some kind of plastic plugging some of the holes and that it melts at a certain overheat temperature to allow the coolant to bypass. When I blow into the hole it freely passes the thermostat. When I invert and the plunger moves air will not pass.
How is it supposed to work? No one seems to know and I spent six solid hours searching on the internet.
Wednesday, January 10th, 2007 AT 12:58 PM