HVAC Control Hisses

Anything related to the factory RPO Crew Cab.

Moderator: F9K9

okaussie
Crew Elite
Crew Elite
Posts: 137
Joined: Fri Nov 13, 2009 8:23 pm
Location: Moore, Oklahoma

HVAC Control Hisses

Post by okaussie »

I have a 2002 CC. Has 135K miles on it. No real problems. Now I have a hissing sound in my cab only when the AC is on. When I switch to vent, defrost, etc, the problem goes away. It only happens in any of the three AC positions. It also decreases in sound when I accelerate then gets louder when I stop accelerating.

I have read the other posts here regarding the Transfer Case switch. I have had no problems with switching into and out of 4WD.

This problem just started today. Do I have a problem with the HVAC Control or is it in the Transfer Case switch on the transfer case.

TIA

Bill
Top
SleeperSS
Enthusiast
Enthusiast
Posts: 29
Joined: Fri Oct 30, 2009 5:38 am

Post by SleeperSS »

It sounds like a loose vaccum connection on the back of the function knob.
Top
okaussie
Crew Elite
Crew Elite
Posts: 137
Joined: Fri Nov 13, 2009 8:23 pm
Location: Moore, Oklahoma

Post by okaussie »

When I get home from work on Monday, I will take it apart and see what I find.

Never had very many problems with my truck and pretty happy with it. Just had new tires, all the fluids and filters changed and the thing just keeps on truckin.

Let you all know what I found.

TIA

Bill
Top
Jongo88
Crew Elite
Crew Elite
Posts: 374
Joined: Sun Jan 25, 2009 6:33 pm
Location: Valrico, Fl.

Post by Jongo88 »

I hope you don't find transmisson fluid it it...
2002 GMC Sonoma crew cab 4x4. Tb mod, Air box mod, pre cat delete,B&M shift improver, Trans cooler, Big three ,AD-244 alt,Red top Optima, e-fan, HD Radaitor,265/70-16' on 16x8 TA wheels,, t-bar tweek, 1.5 inch shackles and 2 inch body lift,Skids fender trim, 1.5 inch wheel spacers in front and 2.5 in back, Quad mod and Frog lights.
Transfercase vacuum switch change DO IT!!!
Top
okaussie
Crew Elite
Crew Elite
Posts: 137
Joined: Fri Nov 13, 2009 8:23 pm
Location: Moore, Oklahoma

Post by okaussie »

How do I get the dash apart to get to the HVAC controls?

It looks like that the rim that covers the controls is part of an assembly that goes over the entire dash, above the steering wheel clear to the drivers door.

TIA

Bill
Top
User avatar
HenryJ
Admin K Elite
Admin K Elite
Posts: 12705
Joined: Tue Oct 01, 2002 9:14 pm
Location: Ontario, Oregon
Contact:
Contact HenryJ

Post by HenryJ »

You are right:

Image

"Speed doesn't kill, suddenly becoming stationary does." - Richard Hammond
"Speed is just a matter of Money - How fast do YOU want to go?"-Mechanic from Mad Max-
If at first you don't succeed - Don't take up Skydiving! - ThunderII KE7CSK
Top
okaussie
Crew Elite
Crew Elite
Posts: 137
Joined: Fri Nov 13, 2009 8:23 pm
Location: Moore, Oklahoma

Post by okaussie »

That is what I thought. The next question in the quest for hissing is,

How do I remove this to get to the controls?

How many screws, where, clips, etc.

I have a Haynes repair manual and nowhere does it give instructions on how to successfully remove this part.

TIA

Bill
Top
User avatar
HenryJ
Admin K Elite
Admin K Elite
Posts: 12705
Joined: Tue Oct 01, 2002 9:14 pm
Location: Ontario, Oregon
Contact:
Contact HenryJ

Post by HenryJ »

The exact steps including the number of clips and screws is not something we are going to be able to help you with here. Not even the factory Helm's manual goes that far into detail.
If you are uncomfortable with diving into this sort of dis-assembly, I would suggest seeking help from a local that will let you watch the process.

"Speed doesn't kill, suddenly becoming stationary does." - Richard Hammond
"Speed is just a matter of Money - How fast do YOU want to go?"-Mechanic from Mad Max-
If at first you don't succeed - Don't take up Skydiving! - ThunderII KE7CSK
Top

Return to “Stock Crew Cab”