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Bad thermostat would be the first thing to check. After that, heater core. I tried replacing the thermostat. No good. I moved to the heater core. Diconnected the hoses and ran a garden hose into it to "flush" it and a bunch of black stuff came out. Hooked it all back up and works great. Not sure where the black stuff came from but it was apparently keeping the coolant from flowing and heating properly in the core.

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โˆ™ 2006-02-24 16:37:08
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Q: What would cause the heater to heat poorly or lukewarm in a 1994 Ford Escort?
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