Quote:
Originally Posted by mplafleur
There is a small fan motor under the dash by the passenger dorr. It is used to draw cabin air past a temperature sensor. If the fan is not working, you will have unpredictable fan/temperature operation.
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This is the easiest and cheapest thing to check. Your symptoms sound alot like mine before I replaced the tube between the temp sensor and fan. Getting air flow over the sensor is critical.