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Heater problems - '96 9000 CS
Posted by A. Rosen [Email] (more from A. Rosen) on Tue, 9 Jan 2001 21:19:58
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Car is having intermittent heater/temp guage/ACC/blower problems. Dealer seems to be stumped (vehicle there for over two weeks)Here are the symptoms:
1) Heat and ACC system operate fine every day for approx. 20 minutes
2) After 20 minutes, and ONLY when vehicle is at IDLE, the heat shuts down AND the blower begins to squeak/chirp. The air output goes lukewarm and then cold. The airflow seems as strong as before, just cold.
3) At the same time, the outside temperature indicator climbs from, let's say, -6 degrees celicius to +10 degrees celcius in just a couple of minutes
4) As I begin to drive, the heat comes back, the blower fan continues to chirp, and the outside temperature indicator reads accurately again.
5) Drove the vehicle for 5 hours on the highway on the weekend and the heat and ACC worked fine. As soon as we exited the highway and were idling at a stoplight, the problem occurred.
6) I recall in the summer, the outside temperature reading runs 10 degrees-20 degrees celcius higher than the actual outside temperature when the vehicle is idling or in stop-and-go traffic.
The dealer initially replaced the heater control module with no result and now suggests replacing the EDU that sits in behind the instrument cluster. This is an $1100 part plus labour to diagnose and install. They admit that they are guessing but cannot find any mechanical problems, and have checked all sensors etc..
Any help or suggestions will be much appreciated.
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