Quote:
Originally Posted by djnolan
MJ,
71C should be hot enough to get some heat. Can you actually move the lever on the heater valve? It could be stuck closed.
A problem with the heater control valve opening may also be caused by the vacuum solenoid valve going bad. Remove the solenoid and apply 12 VDC to valve to see if it opens and closes properly.
Also air in the cooling system could be a cause of too little or intermittent heat.
Intermittent Heat
If your car's heater works fine while driving down the road but the air from the vents becomes cold at idle, you probably have air in the coolant system. Air pockets in the coolant system often accumulate in the heater core. At higher engine RPMs the coolant pump will develop enough discharge head to force some coolant through the heater core. However, at idle, the air pocket will keep coolant from flowing through the core. If you are experiencing these symptoms, vent the coolant system using the COOL-02, Coolant System Draining, Filling, and Venting.
My ventilations system alternates between blowing hot and cold air. (Late Model 944s)
Possible Causes
Checks
Procedure
Typically this is caused by a dirty interior air temperature sensor. There is a small fan that supplies air flow to the interior air temperature sensor. It's located behind the small round vent next to the cigarette lighter. Underneath the dash follow that tube toward the firewill and you'll locate the interior temperature sensor. See pictures in HVAC-01 for sensor location.
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It is not the type of heater valve which has that tiny lever. It is another type, i think.
But if i pull off the vacuum lines it should open completely right? And where is the vacuum solenoid valve?
MJ