I'm having probs with the temp gage. When I run the heater the gage will run high and flucuate in the high range. When I turn it off the temp is mid range and holds steady. I thought it might be the thermostat or maybe a leak. Any ideas?
I am not sure, Usually when you run the heater the temp goes down
What year windstar is it. I had a 1995 with 45,000 miles on it. It did the same thing. Took it to the dealer. It ended up having a blown head gasket. Ford has a silent recall on the 1995 windstars with the 3.8L engine. If it goes bad before 100,000 miles Ford will replace it for free. After 100,000 miles they will tell you tough luck.