mytrplseven

Also listed on PP:
While road testing the car yesterday, car went to instant HOT. I put a two foot piece of vacuum line on the heater shutoff valve and sucked on the vacuum line. This is actually a quick diagnostic procedure. The valve operated normally and the vacuum line I used held it's suction, so that ruled out the diaphragm on the shut-off valve.

Since I have a later model car, there's a cover that shields the linkage on the driver's side from view. I can see two screws and wondered if anyone had pulled off this cover and how many screws there are. I want to inspect the linkage for the busted plastic clip. Supposedly my car has two links and would appreciate any pics of this version of the heater control.

Jorgen944

Heat shut off valve is vacuum run eh? my vac lines were all destroyed by the previous owner but my car also leak hot air in the cabin like crazy, hopefully the vac line kit I bought will fix me right up.

No use to you but thanks for posting this and making me see where my issue may be.

mytrplseven

Sounds like your heat issue will go away after you replace all the vacuum lines. Putting a vacuum line on the shutoff valve and sucking on it, you should see the valve arm moving if the valve's ok. Real easy.