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Old 01-25-2004, 12:25 PM
stevebfl stevebfl is offline
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Join Date: Mar 2000
Location: Gainesville FL
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Actually the pump does play a big part in keeping the heater core hot when the engine speed drops like in traffic. A common problem we have seen on some models is after sitting at a light and the heater on mid setting, the valve goes to a higher duty cycle as the heater core cools due to low flow at idle. Upon accelerating the heat bursts upon the car as the vale is still wide open and the increased engine speed floods the heater core.

I would suspect a sensor problem or a controller problem, but you probably need a technician that understands the system and has the information to test it properly.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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