| Subject: | Low Coolant Indicator or Coolant Leaking from Engine |
| Models: | 2006-2007 Chevrolet Impala, Monte Carlo, Malibu, Uplander |
| 2006-2007 Pontiac G6, Montana SV6 |
| Equipped with 3.5L (LZ4/LZE) or 3.9L (LZ9/LZ8/LGD) Engines |
This PI was superseded to update Recommendation/Instructions. Please discard PIP3900C.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some owners may comment about a low coolant indicator or coolant leaking from the engine. The gasket/seal located between the coolant crossover and the front of the right (rear side) cylinder head may be leaking.
Recommendation/Instructions:
At the present time the only recommended fix is to install a new currently available service gasket (P/N 12577704). When replacing this gasket it will also be necessary to replace the gasket on the opposite side cylinder head. That gasket is P/N 12590668.
Before installing the new gaskets make sure that the mating surfaces on the crossover manifold and cylinder head are completely clean and that NO OIL or OIL RESIDUE exists. The correct labor operation for this repair is J3527.
Please follow this diagnostic or repair 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.
