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'96 965 heater problems S90-V90

uid 19's pic
posted by  jbowers on  Wed Oct 12 04:39 CST 2005
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last visit: Sun Jan 22 13:49 CST 2012
[RELATED]

That valve is not a proportional valve. It is designed to be either opened or closed. The temperature in the car is controlled by mixing the air from the heater core with unheated air.

Your problem may be as simple as a a vacuum line disturbed somewhere. At the firewall, make sure all 3 lines are OK. One is from the control unit to the valve you focused on. Another supplies vacuum to the control unit and the 3rd sucks air through the internal temperature sensor located in the dome light housing.
--
'96 965, 16' wheels, Michelin Pilot Sports, rear 18mm bar + Koni, 201 HP cams, 129K. Put 200K on '85 745 TD.






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