Need advice on a front heater core issue:  shop says there is no flow through it. No front heat. Just replaced thermostat. They took off return line at core and replaced with clear hose, said flow was a dribble. They don’t think it is blocked, not sure why. They also flushed coolant system. Not sure what lower valve with vacuum line does, but vacuum is good, causing valve to move from off position (plunge downward). When I pull off hose, plunger goes up. What else may affect flow to heater core?

Anyway, mechanic wants to replace water pump, another grand. I don’t want him throwing parts at this without clear idea. Van does not over heat, temp stays at 190. Water pump is only 4 years old, replaced when chains were done at 175k.

Matt
2002 weekender 211k
Durham, N.H.


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