I've replaced the thermostat and fan switch that mounts on the thermostat. Removed connector from fan switch and jumpered the contacts - fan runs. Normal driving keeps temp normal and provides heat to interior. Stop at stoplight and heat gauge starts climbing and heater blows cool air. At home, kept car in gear with brake on and watched temp increase. Put car in park, popped hood, fan not working.
I had the same issue over the summer. I checked the fuse, and needed to replace it. have not had any issues since.
Allan
Bad thermostat or worse a plugged heater core or bad summer/winter diverter valve. look for bad thermostat.
To install:
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Exactly same problem, cap is releasing pressure due to a malfunctioning fan. Could this be a harness issue? (Bad grounds etc..)Is there an alternative wiring issue perhaps?
took to pep boys for repairs. drove off. 1 hr after repairs cars indacator reads hot pulled over to let cool & check radiator. had too replace coolant in over flow and radiator. continued my trip. cars temp would rise to red zone if i slowed down to exit hwy or climb a mountain.got home. put in the fan switch & relay. Still have heating problem when I take this trip to AZ from CA. went back to pep boys about 6 times complaining i still heat up. they did several pressure tests found nothing wrong told me they cant fix unless they see it running hot. only runs hot on long mountain terrain.
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