i have a ?. my heater is not working . the fan blows. i replaced the temp control valve . and the hoses get hot. just there is no hot air . im thinking a vacume hose is bad or has came off. the heater core should not be bad cause there is fluid flowing throught it . so any help, i would be greatful because its getting really cold out there. o and also if any one has a pis or can send me a pic of the vacuum diagram for an 88 camaro. 305 tbi thank you very much

chris

 

Check and see if your thermostat is stuck open.

 

ok ... exactly how would i go about doing that. I've never actually had any reason to. so i'm not exactly sure how to do it. Usually i'd just replace it if i thought something was going wrong. But usually the car only runs at a temp of like 100 according to my temp gauge, which i think might not be working quite properly... i replaced the radiator with a brand new one over the summer, and since then it seldom goes over the first line, and no where near 220*. I know the thermostat would open up occassionally while i was on the road. before the radiator was replaced, i'd dog it a bit, and the temp would drop very quickly when the thermostat opened up, but it'd go back up pretty quickly ..and do it agin. but sinc e i replaced it hasn't gotten over like 110, unless it was 100+ degrees outside and i was in traffic. and i know 190 is normal right? i will do though. hell the thing might just be bad. but yea thanks.

 

The temp of the air is controlled by a little door, that is positioned by a cable that goes to the door from the temp slider on the control head. You can see the lever for the little door under the dash, not too far to the pass side from the hump.

I'd bet the cable is messed up somehow.

Vacuum malfunctions will not cause this.

 

checked it. the door is working. i'm going to go ahead and check the thermostat just in case.
ty

 

The best way to check your thermostat is to boil it on the stove, and check the opening temperature with a thermometer. I even check new ones before I install them, just to be sure.

 

ill problly just put a new one in for the price why the hell not right . thank you for all the help guys