A/C only works when it's turned.... OFF!?

[Springthing]

Ok, 2nd post and it's a HELP! post... go figure! I hope I've put this in the correct forum..!





I have a problem with the new addition to the family. Just bought a Suburban and here's what happens when I get to fiddling with the A/C control knobs:

In turning the knob (main/front one) to [OFF] the a/c kicks on. If I place it on [LOW] sometimes it stays on (blowing at max) sometimes it turns off completely. In the next few clicks the a/c just turns completely off. Again if I turn to [LOW] again sometimes it will kick on, sometimes it will stay off. If I turn it to the [OFF] position it starts up full blast again.

The only background I have is that the guy I bought it from just noticed it 'this morning' when he took it out for a test drive... *cough**hack*BS!*cough**cough**wheeze**hack*...

Anyhow... moving on... so.. oh yes, the a/c thing. So the problem only happens to the front controls. As far as i know the rear one works as it should, and the front control for the rear works as it should.

I have taken the liberty of taking a short video and posting it on YouTube. I hope it's alright that I post the vidclip on this site.

Click for the VidClip:




1999 Chevy 2500 Suburban
164,xxx miles
8 Cyl 7.4 liter Vortec

Again, no other background information available.


If anyone has any insight as to what I could be looking at, what the problem may be, or even how to fix it (short of bringing it to the dealership and saying "here, let me let you have this for a few days after which you can tell me how much money I should get a small loan for and then give you" ... no, I've not had ANY good experiences with dealership shops...) I would be more than happy to hear!

Thank you so much in advance!

Steven

[GaryL]

Looks like you need a new switch. I have seen some that get hot and melt the switch and even the wires.

[Springthing]

Thanks Gary!

Any other takers?

[vncj96]

yeah i would go with a new hvac controller you can get them on ebay pretty cheap

[Springthing]

Alrighty...! That I can do.

I'll be back to let those interested know if that fixed the problem or not.


Steven