Tinkering with a 99 Suburban

[nathanadams16]

Any GM HVAC gurus here? I’m having trouble with my AC. When I bought it the AC didn’t work, wasn’t too worried about it at the time since it was winter. Fast forward a couple months and warmer weather has arrived. So I did some tinkering and turns out my compressor was junk. Got a replacement put new seals on the line and pulled a vacuum test. It held fine so I charged it and now I have AC, woohoo! Well kinda, now I have rear AC and defrost vent AC but I have floor heat simultaneously but nothing comes out of the forward facing vents. Any thoughts would be extremely helpful!

 

[Erik the Awful]

Your blend door isn't working. My daily driver Mustang is doing the same thing right now.

 

[movietvet]

That problem is typically related to actuators for blend doors. It can be a tedious process. You may have an actuator that has failed, a connection that has failed or a blend door that is bound up for some reason.

Like one of these: https://www.rockauto.com/en/moreinfo.php?pk=85809&cc=1353686&pt=10721&jsn=960