1FastBrick

iTrader: (17)

Is it still blowing cold???

I found a TSB related to a hiss in the cabin

Bulletin No.: 06-01-38-002

Date: March 17, 2006

TECHNICAL


Subject: A/C System Refrigerant Hiss Noise (Replace Liquid Line) #06-01-38-002 - (03/17/2006)



Models: 2003-2006 Cadillac Escalade Models

2003-2006 Chevrolet Avalanche, Silverado, Suburban, Tahoe

2003-2006 GMC Sierra, Yukon Models

with 4.3L, 4.8L, 5.3L, 6.0L or 8.1L Engine (VINs X, V, T, Z, B, U, N, G -- RPOs LU3, LR4, LM7, L59, L33, LQ4, LQ9, L18) and Air Conditioning (RPOs CJ2, CJ3 and C69)




--------------------------------------------------------------------------------

Condition
Some customers may comment on a hiss noise coming from the instrument panel. The noise has also been described as sounding like a gurgle or water spattering. The noise occurs when the Air Conditioning (A/C) compressor engages and may continue for 5 to 10 seconds after the compressor disengages or the A/C system is turned off. The noise is most noticeable when the vehicle is at idle or is being driven at low speeds. The noise is undetectable after about one minute when the A/C system has been turned off or the vehicle has been turned off.

Cause
This condition may be caused by the expanding refrigerant as it passes through the orifice tube.

Correction
Technicians are to verify that the customer concern is only as described in the condition statement above. If the customer concern is a refrigerant hiss noise, then technicians are to perform the normal diagnostic procedures for an A/C system concern. The ACR2000 should be used to check the A/C system performance, charge level and discharge temperatures. This will eliminate the possibility that another condition is contributing to this customer concern. If the A/C system is performing properly, and all other possible sources of this noise are eliminated, then technicians are to replace the A/C liquid line. Use the proper part number as described in the parts information box below. Verify that the noise has been eliminated and that the A/C system operates normally.

Parts Information
Important: The trucks affected by this bulletin that have rear air conditioning were built with two different length condensers. The short condenser is 762 mm (30.0 in) long. The long condenser is 914 mm (36.0 in) long. Be sure to measure the length of the condenser before ordering one of the tubes listed below for vehicles with rear air conditioning.

Part Number
Description
Qty

15785055
Tube ASM-A/C Evaporator (vehicles with C69 and a long condenser)
1

15785056
Tube ASM-A/C Evaporator (all vehicles with front only A/C)
1

15785057
Tube ASM-A/C Evaporator (vehicles with C69 and a short condenser)
1


Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

D3083
Hoses And/Or Lines, Refrigerant-Condenser To Evaporator (Liquid Line) - Replace
Use published labor operation time

Add
To Recover and Recharge A/C System
Use published labor operation time

oakley6575

iTrader: (5)

Yes it is till blowing cold.

I know the sound that is being described in the above post. But that is not what is happening. It is under the hood and is definitely the compressor. I will try and get a video of it tomorrow.

01WS6/tamu

iTrader: (36)

Whats the head pressure doin when you rev it up to 1200 sittin still.

oakley6575

iTrader: (5)

I would have to get gauges back on it. Not sure

stevenc

iTrader: (1)

I am starting to think those compressor works compressors are pieces of crap.
I just placed that same compressor in my suburban and I am having a similar sound as you.

oakley6575

iTrader: (5)

Interesting. I wonder if I should go to the junkyard and see if I can find a compressor to try just for ***** and giggles.