A/C - Use of A Thermal Expansion Valve

91pontiac14

Bulletin Number: 92-1-2
Reference Number: 131215
Publish Date: 12/91


Subject: INFORMATION BULLETIN - USE OF A THERMAL EXPANSION VALVE IN PLACE OF EXPANSION (ORIFICE) TUBE

Models
Affected: 1992 GRAND AM MODELS WITH A/C


This is an information bulletin to familiarize technicians on the use of a TXV (Thermal Expansion Valve) for a means of controlling refrigerant flow. The TXV is located inside the heater/evaporator module, attached to the evaporator. The Expansion (Orifice) Tube is no longer used on these models.

The 1992 Grand Am air conditioning system still uses the V-5 compressor, but has gone to the use of the TXV for specific performance gains. Compressor operation is basically unaffected, however there are major differences in system pressures, performance and diagnosis between the two systems.

IT IS VERY IMPORTANT THAT THE SPECIFIC TXV SYSTEM DIAGNOSIS CHART, AS SHOWN IN SECTION 1B OF THE 1992 GRAND AM SERVICE MANUAL BE USED.