Identity Crisis Posted December 3, 2007 Report Share Posted December 3, 2007 My heater comes on and blows good heat. BUT It is stuck on AC MODE and only blows through the vents. I cant get the AC turned off and have the heater blow on the windshield or any other setting for that matter. What is wrong? Does anyone know? It made driving to work today in a near blizzard scarry. Help Thanks Quote Link to comment Share on other sites More sharing options...
slick Posted December 3, 2007 Report Share Posted December 3, 2007 Your vacuum lines are screwy. Check the t-connection right beside the battery, and check your lines behind the intake plenum. Quote Link to comment Share on other sites More sharing options...
Identity Crisis Posted December 3, 2007 Author Report Share Posted December 3, 2007 Nothing has been touched or changed though. Do you think it would just go by its self? Quote Link to comment Share on other sites More sharing options...
Identity Crisis Posted December 3, 2007 Author Report Share Posted December 3, 2007 OK just went out and checked the line by the battery and it is all connected. Cant get behind the plenum but I have not been messing around back there. Quote Link to comment Share on other sites More sharing options...
slick Posted December 3, 2007 Report Share Posted December 3, 2007 Doesn't matter if you've messed with them or not, they are rubber and hard plastic vacuum lines, they are bound to get old and hard, and start cracking or breaking. Only other 2 options would be a bad HVAC module, or the modules that control the vents went bad, but both of these don't happen all too often. Quote Link to comment Share on other sites More sharing options...
Identity Crisis Posted December 3, 2007 Author Report Share Posted December 3, 2007 Get this. First off I know how the Vac Lines work. Second they mostly only have problems when someone has fudged with them either on purpose or by accident. So I go out at lunch and check the lines. All seem ok. I test the heater still the same problem. I go out after work start the car up and it is doing it again. I shut the car off after 3 min and then fiddle with the controls and then turn the car back on and WALLA! It is all good. Heat is just a blowin from the defrost. I drive home and run the car while I am clearing the driveway of snow. I park the car and turn it off. Then I start it again and it is still working fine. I would have to believe that it is not a vac problem but rather an HVAC issue. Just lets hope it stays working until I can replace all the vac lines and be able to get behind the plenum and check it out. Thanks for the advice on the possable problems. MERRY Christmas. Quote Link to comment Share on other sites More sharing options...
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