A/C Evaporator Core - Reduction of Leaks
90pontiac10Bulletin Number: 90-1-13
Reference Number: 071201R
Publish Date: 5/90
Subject: REDUCTION OF POSSIBLE REFRIGERANT LEAKS AT THE EVAPORATOR BLOCK - INSTALL CAPTURED O-RINGS
Models
Affected: 1990 GRAND PRIX MODELS
Just after the start of production (VIN's could not be determined) on the 1990 Grand Prix models, the inlet and outlet fittings to the evaporator were changed from a standard O-rings design to a captured O-rings design to reduce leaks. When making necessary repairs at the evaporator, if new O-rings are needed, make sure the correct captured design O-rings are used.
The captured O-rings part numbers are as follows:
1/2 Pipe O-rings - 52454645 3/4 Pipe O-rings - 52454646
Parts are currently available from GMSPO.
The opposite end of these fittings are the standard O-rings design.