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1986 944 HVAC at full Throttle

Heating and Ventilation

Vehicle Information: Model(924/944): 944; Year: 1986; Engine (type, size, modifications): 2.5; Total Mileage: 97,000;

There is no temperature control in my 944. I got the A/C working last summer but it is either on or off as the temperature swith has no affect on fan, temp, etc.The A/C itself is holding charge, and cools the car off. To get heat I have to disconnect a vaccum line so heater will give hot air.Both heat and cold air work OK its just the regulation part is out of line.When A/C is blowing and I go to full throttle the system goes from cool air to full hot. Is that normal?I've replaced the water mix valve which was broken, also replaced the foot well clip for blender door arm and it goes up and down with the switch. The vaccum lines appear to be doing their job but no temp control. Do the temperature regulator switches go bad? Thats a pretty expensive part.

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