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Heat stays on

Heating and Ventilation

Model: 944, Year:1988, Mileage:119000, Type of use:Street use only
My 944 a/c was working fine but the heater wasn't working. The prez of my pca chapter looked at the problem and changed some things on the vacuum lines which appeared to be correct. But after making a couple of changes now only the heater works and NO a/c. Is there the possibility of one of the valves may be faulty. I looked at some diagrams of the lines but I can't make heads or tails of what's correct. Is it true that the cars system defaults to only heat when there is a problem

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