A/C - No HVAC Cooling, A/C Belt Dislodged
TECHNICALBulletin No.: 12-06-01-006
Date: June 28, 2012
Subject: No HVAC Cooling, A/C Belt Dislodged
Models:
2008-2009 Pontiac G8
Equipped with V8 Engine
Condition
Some customers may comment on a total loss of air conditioning function due to a dislodged A/C compressor drive belt.
Cause
The A/C belt jumps off the crank pulley due to a crankshaft resonance above 3000 rpm. This resonance causes the belt to oscillate across the top span between the A/C pulley and the harmonic balancer, causing the belt to dislodge.
Correction
Engineering has released a revised A/C bracket that incorporates an idler pulley preventing excessive belt oscillation.
A longer belt has also been released to allow for the additional length that is introduced due to the idler.
Quality improvements to harmonic balancers have also been implemented in production.
The new compressor support bracket incorporating the idler pulley is shown above.
These revised components were introduced into production from the following breakpoints:
Any vehicle exhibiting this condition, built before the above breakpoints, that presents itself with a loss of A/C function as a result of the A/C belt dislodging, should be fitted with a revised A/C bracket and belt. The existing tensioner is to be reused and installed onto the revised A/C bracket.
In addition to the above service fix, inspect the harmonic balancer for runout of the outer ring. If found, also replace the harmonic balancer.
Note
The balancer and bolt are only to be replaced when close inspection reveals runout of the balancer. Replacement of the balancer is not permitted unless it exhibits a reasonable amount of runout.
Parts Information
Warranty Information (Holden)
For vehicles repaired under warranty, use:
Warranty Information (Pontiac)
For vehicles repaired under warranty, use.
Disclaimer