Impala V6-3.5L VIN N (2006)
Cylinder Head Gasket: Customer Interest
Engine - Coolant Leak/Coolant Loss
TECHNICAL
Bulletin No.: 08-06-01-012A
Date: November 19, 2008
Subject:
Engine Coolant Leak, Loss of Coolant (Replace Affected Cylinder Head Gasket)
Models:
2006-2007 Buick Terraza
2006-2007 Chevrolet Monte Carlo
2006-2008 Chevrolet Impala, Uplander
2008 Chevrolet Malibu
2006-2008 Pontiac G6, Montana SV6
2006-2008 Saturn Relay
2007-2008 Saturn Aura
with 3.5L or 3.9L Engine (VINs N, K, R, W, 1, 3 - RPOs LZ4, LZE, LZ8, LGD, LZ9, LZG)
Supercede:
This bulletin is being revised to better clarify the number of cylinder head bolts that need to be replaced. Please discard Corporate Bulletin Number
08-06-01-012 (Section 06 - Engine).
Condition
Some customers may comment on a coolant leak. The comments may range from spots on the driveway to having to add more coolant.
Upon inspection, the technician may find that there is a external coolant leak coming from the top end of either cylinder head.
Correction
Follow the appropriate diagnostic information in SI. If a leak is found to be coming from a cylinder head gasket, the gasket must be replaced. When
replacing the gasket be advised that larger flange hex head bolts are now to be used at locations 5 and 8. The larger flange hex bolts are the same as the
ones used at the other six locations. When installing the two large flange hex head bolts at locations 5 and 8 a new style lower intake manifold gasket that
has provisions to allow for the larger flange bolts must be used. These new lower intake manifold gaskets are contained in the gasket kits listed below.
Replace the other six bolts as well as stated in SI.
Caution:
Failure to use the new lower intake manifold gaskets when installing the larger flange hex head bolts at locations 5 and 8 may result in the lower
intake manifold not fitting properly, which may result in a leak condition.
Important:
Lower intake manifold gaskets contained in older gasket kits will not have the provisions needed when installing the larger flange bolts.
