Air conditioner

**AfterYou** · 11-28-2010, 07:35 PM

When i turn on the car, with the knob for the air on "off" then turn it to a/c, or max. It makes a weird sound like its depressurizing, then when i turn it back "off" it also makes a weird sound, and makes my car make a really loud sqeak sound, Any ideas? or is it just normal

**AfterYou** · 11-28-2010, 07:52 PM

***SMWS6TA*** · 11-29-2010, 11:52 AM

loud squeal could be bearings going on the compressor or belt. The decompression sound is normal. I know the HVAC lines come off the back of the intake manifold and that is how they get the pressure to activate the ac/heater. When you turn off that pressure needs to go some where. So it has a bleeder value that releases the pressure.

**Smittro** · 11-29-2010, 11:59 AM

Originally Posted by SMWS6TA

loud squeal could be bearings going on the compressor or belt. The decompression sound is normal. I know the HVAC lines come off the back of the intake manifold and that is how they get the pressure to activate the ac/heater. When you turn off that pressure needs to go some where. So it has a bleeder value that releases the pressure.

This..

Also the line comes off of the MAP sensor and heads towards the tranny on the passenger side fire wall.. Very hard to see but there's a "T" fitting back there also one line goes to the tranny and the other goes to the dashboard controls. I remeber you said something about jacking the car up for the back plug on that side.. I'd check to see if the "t" is still intact and did not crack or breaking.. But I'll tell you also it will be a chore just to see it back there.. But yes the hissing sound or depressurizing sound from behind the control panel is normal for us..

**AfterYou** · 11-29-2010, 03:30 PM

Alright, So for the most part this is normal?

**Smittro** · 11-29-2010, 03:36 PM

Originally Posted by AfterYou

Alright, So for the most part this is normal?

I'm gonna go out on a limb here and say yes.. The vaccume actuator (better know as a vacume bowl) will sometimes howl or make a sqweaking sound as it releases or compresses.. Does'nt always mean it's bad just annoying.. I would still check for VAC leaks as this can cause a slow movement on the part I mentioned and VAC leaks in general are a bad thing..

**20ws6speed01** · 11-29-2010, 04:24 PM

a/c compressor does NOT sound very good...may just be the video

**Smittro** · 11-29-2010, 04:29 PM

Mine has made that exact noise for ~5 years now since the day I got it with ~26k on the clock.. Still thows snowflakes lol.. But I agree it sounds bad..
You can fix it or live with it imho..