dash hiss, anyone else hear it?
03-28-2005, 11:49 PM
#2
Originally Posted by moregrip
just wondering if anyone else notices a slight hissing noise from what seems to be in the dash. Is there anything that operates off of vaccum in there?
03-28-2005, 11:53 PM
#3
There is actually a service bulletin saying it's normal..
03-05 Chevrolet/GMC/Cadillac All Full Size Trucks and Utilities Hiss Noise from Dash with AC On - kw HVAC idle blower compressor line hose #PIT3344 - (Jan 4, 2005)
03 - 05 Chevrolet/GMC/Cadillac All Full Size Trucks and Utilities Hiss Noise from Dash with AC On
.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.
Condition/Concern:
Customers may comment of a hiss noise coming from the dash area with the A/C on. The noise can come and go or change intensity depending on A/C system loads (outside temp, engine RPMs, humidity, etc.)
Recommendation/Instructions:
The noise is normally only heard while stopped with blower on low and radio off. The noise is coming from the A/C orifice tube and is normal. No repairs should be made.
.
Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
Models:
(03-05 Chevrolet All Full Size Trucks and Utilities) and (03-05 GMC All Full Size Trucks and Utilities) and (03-04 Cadillac All Full Size Utilities)
03-05 Chevrolet/GMC/Cadillac All Full Size Trucks and Utilities Hiss Noise from Dash with AC On - kw HVAC idle blower compressor line hose #PIT3344 - (Jan 4, 2005)
03 - 05 Chevrolet/GMC/Cadillac All Full Size Trucks and Utilities Hiss Noise from Dash with AC On
.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.
Condition/Concern:
Customers may comment of a hiss noise coming from the dash area with the A/C on. The noise can come and go or change intensity depending on A/C system loads (outside temp, engine RPMs, humidity, etc.)
Recommendation/Instructions:
The noise is normally only heard while stopped with blower on low and radio off. The noise is coming from the A/C orifice tube and is normal. No repairs should be made.
.
Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
Models:
(03-05 Chevrolet All Full Size Trucks and Utilities) and (03-05 GMC All Full Size Trucks and Utilities) and (03-04 Cadillac All Full Size Utilities)
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03-29-2005, 04:34 PM
#8
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It isn't when the AC is on, it is when it is on recirculate. Turn the recirculation on while driving down the highway, and then turn it off and wait about 5 sec while driving down the highway. It will go away. There isn't a seal at all on that door that opens and closes. One of the guys on the silverado ss board fixed his, but I wasn't able to get any pics from him.
Aaron
Aaron
