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Automatic climate control 700 1986

posted by  andyrewj on  Mon Feb 1 09:48 CST 2010
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last visit: Fri Sep 20 16:11 CST 2013
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No kidding? I don't get heat until the emgine (sic) warms up? Weird. Volvo thinks that the ACC does monitor coolant temp, I think I'll go with them on that one. I know where the gauge and ECU sensors are, the gauge sender is not used by the ACC if the ACC uses the ECU sensor, it would have to be through the ECU, I do not believe that is the case. Seems to me I would have drivability issues if the ECU never saw the engine temperature. Someone correct me if I am wrong.

For anyone else that has useful input, I found on further reading that the fan runs in automatic if either the coolant temp is above 95*F or the cabin temp is above 64*F. It would appear that the reason my fan eventually runs in auto is because the cabin temp gets above 64* from my putting the heat control on defrost (runs the fan on high no matter the coolant temp). So this further reinforces the idea that the coolant temp sensor is bad. I suppose it could be the ACC module. Am I the only one to ever have this problem?






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