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Cause of Slow heating system


aoist
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My engine worms up to normal temp in about 3 min, but I have no heat until about 20 min. Even then the heat is not very  warm. 

What could be the most likely cause?

Thank you for any and all suggestions?

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Sounds like the heater core is plugged or less likely a kinked hose.

To add: the diverter valve may not be opening all the way or partially obstructed.

Edited by CALPATHY
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