Quote:
Originally Posted by Gregory
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When the engine is up to temp 80-85C, and then shut off for 20 or 30 minutes, then restarted, the heat comes out the vents for about 5 minutes. Then the air flow into the cabin is hardly warm at all.
So when it sits, the hot fluid seeps into the heater core, but its not being recirculated when the engine is running.
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There is a float valve in the monovalve which prevents the symptoms you're having. If you shake it, you should hear it rattle. It may be clogged or jammed. Clean it out by soaking it in CLR (calcium lime rust) solvent and see if that cures it.