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Re: More info on heater fault.. '96 CSE
Posted by Sjer (more from Sjer) on Sun, 2 Nov 2003 11:13:29
In Reply to: More info on heater fault.. '96 CSE, Greg, Sun, 2 Nov 2003 07:18:41
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It is easy to check for blockage in the heater core. Disconnect the heater hoses, put a cap on one of them, and blow low pressure air through a hole in the cap.
It does sound like you may have blockage, but keep in mind at idle there isn't much water flow and some heat goes into heating the heater core mass when the car is first started. So the heater hose temps will be noticeably different.
If you don't find blockage, here's another thing to check- the door that regulates the air flow through the heater core can break. Disconnect the cable to the plastic arm and move the arm by hand. If there is a lot of play, the door is likely broken. You can also paint the plastic nub on the other side of the door axis to see if it rotates when the arm is moved.
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