Coolant Leak at Heater Inlet Pipe Connector/Fitting (Tighten Connector/Fitting)

Some customers may comment that engine coolant appears to be leaking from below the EGR valve pipe assembly at the rear of the water pump housing.

A pink tell-tail line of coolant below the attachment of the EGR valve pipe assembly and the heater inlet pipe connector/fitting, at the rear of the water pump housing, may be visible. An accumulation of coolant on the transmission case directly below the heater inlet pipe connector/fitting may also be visible.

This condition may be due to the heater inlet pipe connector/fitting threads with sealant not being sufficiently engaged to the engine assembly.

Ensure the heater inlet pipe connector/fitting (1) is tightened to the proper torque specification.

1. Disconnect the transmission shift cable from the shift lever.
2. Use a 1 1/16 inch off-set wrench to tighten the connector/fitting taking care not to exceed 40 N·m (30 lb ft).

Important: If the connector/fitting is torqued to specification, the cause of the coolant leak may be an insufficient amount of thread sealant. Apply GM Goodwrench/Locite ® Pipe Sealant, P/N 12346004, (or an equivalent sealant that meets GM Material Specification 9985473) to the connector/fitting threads.

3. Connect the transmission shift cable to the shift lever.

For vehicles repaired under warranty, use:

*This is a unique labor operation time to be used only with this bulletin.

It will not be published in the Labor Time Guide Book.