Hi
I have a 99' silverado 1500 question.
I have no heat or AC coming through just AIR no temp change at all??? Any thoughts or suggestion will be a huge help. Thanks

 

is the compressor coming on?

 

Im going with no seeing that the belt is not driving the wheel?? any thoughts?

Thanks

 

Im thinking the ac relay?

 

HVAC maybe shot.

 

So i bypassed the relay to try to narrow down the issue and the clutch in!! But within 10 min it was making some loud noise im thinking bearings?? also within the 10 min and 5 min driving did not seem to make a big difference in the warm temp?? slight difference but not enough to really notice a difference.. Any thoughts/opinions will be a huge help??? Thanks

 

Could be the vacuum lines going to your blend door are shot. I think the only way to get this fixed is to pull the control head, and get a hand vacuum pump and working the vacuum lines manually and checking for changes.

 

Thanks NullHead Ill will give this a shot. Are both of these lines supposed to me warm/hot? If so this is not the case 1 line is luke warm and the other no temp..??
Thanks everyone for your input

 

Ok so this silverado ive been trial driving for 2 days now with a possibility of a purchase seems to have no inlet/outlet hoses for the heater core..? unless there is something else going on that im not seeing? I mean they are there but no hoses hooked up??? any ideas/thoughts? Thanks

 

Then it's possible that somebody disabled your heater core ... and drained all the refrigerant. I'd pass on it if you don't own it already. Sounds like there's problems with the HVAC.