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heater fan, auto climate control 700 1987

posted by  someone claiming to be DS on  Thu Dec 27 12:55 CST 2001 [RELATED]

Now that it's getting chilly, I turned on the heat in my 760. The fan would not operate. I moved the control lever to the defrost position and the fan came on full blast. After a minute or so I moved the control lever back to the usual setting and the fan worked. What is going on here?








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heater fan, auto climate control 700 1987

posted by  john r. on  Fri Dec 28 09:08 CST 2001
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last visit: Tue Mar 9 09:41 CST 2010
[RELATED]

Was the engine cold when you first tried the climate control? There is a temperature switch located in one of the coolant hoses connected to the heater core that turns the blower fan on when the coolant gets to approximately 95 degrees. When you put the climate control into the defrost setting, this switch is bypassed and the fan runs at full speed no matter what the coolant temperature. It sounds as if your system is working correctly.








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heater fan, auto climate control 700 1987

posted by  someone claiming to be DS on  Fri Dec 28 23:39 CST 2001 [RELATED]

John, the engine was warm. Temp needle was at midpoint on the gauge. I have a feeling my problem is the temperature switch you referred to. I'll have to check that out. Thanks.







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