noise behind dash

Hey everyone! Just like the title says, it comes on and off? Makes no sense! I have a 2002 Envoy 4x4 SLT with 178,xxx miles & the 4.2 l6 of course. Any pointers are greatly appreciated. I replaced the VC gasket, intake gasket, plugs, battery, alternator, fan clutch.

I just got a new A/C system installed. New compressor, condenser, Accumulator. When I shut off the engine, after a 30 min. or so drive using the A/C. About 30 seconds later I hear a gurgling sound. At first I thought it was the Coolant Reservoir so I tried to burp the radiator with no avail...

Hi im new to this but I have a 2004 gmc envoy and I have a loud grinding (errrrrrrrrrrrrrrrrr sound) coming from behind the center of the dash. It will start when on ACC and restart on startup then stop, then start. This happens 3 times with the second time being louder and higher pitched. This...