Hello again all, tried turning on the heat today and it doesn't seem to be working. I have a 98 blazer lt with the electronic control module heating and cooling. The air that comes out when I try to turn on the heat isn't ice cold but not warm either. Any ideas where to start troubleshooting? Thanks in advance!

 

im guessing the heat and ac control is bad. those things go bad all the time because these are electronically controlled and have many problems. i exxperienced the same problem but the heat just stayed on no matter what. once i replaced it it fixed the problem.

 

well i recently had some ac problems, the guy evacced the system took everything apart and put it together again then the ac worked great. im wondering if somehow that is connected to this?

 

if it's blowing and it's not hot then your controls are messed up, its not making the coolant divert through the heater core so it can blow hot. so either its somethin mechanically or its the switch. only thing the AC has in common is the blower...so if it's blowing its got nothing to do with that