why won't my 1992 corsica blow heat?

[dwiehe]

Can someone please help me? my car will not blow heat, i have change the heater core, the thermostat and i have flushed the system. i am at a loss if anyone can help out i would appreciate it.

[jsgold]

Let me try this again, forgot these are vacuum controlled. The "trap door" on your heat assy may be stuck due to a vacuum leak. Check under the dash for loose hoses etc. There are a couple of round actuators under the dash that control this and one of the hoses may have fell off. Otherwise it could be your thermostat is stuck wide open. The "fail safe" ones usually do that to keep your engine from overheating when they fail.

[jsgold]

Also, possible you have a vacuum leak under the hood. If bad enough this would also keep the actuators from working. Check all vaccum lines under hood if you find nothing under the dash. Vacuum leaks sometimes are a pain to track down.