Quote:
Originally Posted by Scott Douglas
Does the engine reach operating temp OK?
Almost sounds like you have a 'valve' in the line that lets hot water go to the heater core that isn't working correctly.
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This is where I would be looking. Laser heat thermometer, do some investigation.
It's also easy to test your thermostat.
Last, zero heat is a common result from 'head gasket fix in a can'. Heater core might be blocked/plugged. Is the hose to the heater core hot?