For 1990-2009 cars

# Info - A/C Refrigerant System Sealer and A/C System Leak Detection Guidelines

Subject: | A/C Refrigerant System Sealer and A/C System Leak Detection Guidelines

Models: | 1994-2003 Passenger Cars and Trucks

| 2003 HUMMER H2

| with Air Conditioning

It has come to the attention of GM Service Operations that A/C system sealers, A/C system stop-leak products, and A/C system seal conditioners have become available to the consumer and A/C repair industry.

GM Service Operations DOES NOT endorse or approve the use of any aftermarket A/C system sealer, A/C stop-leak product or A/C seal conditioning product in any GM vehicle. The use of these aftermarket products may cause damage to A/C systems and to A/C service equipment.

A/C systems found to be contaminated with A/C system sealers, A/C stop-leak products, or seal conditioners are not covered by the GM New Vehicle Warranty or the GM Replacement Part Warranty.

GM Service Operations recommends the detection of A/C system leaks through the use of GM-approved leak detectors and fluorescent leak detection dyes. GM recommends the replacement of leaking A/C components and the repair of leaking A/C connections. Many federal, state/provincial and local regulations prohibit the recharge of A/C systems with known leaks.

Vehicles found or suspected to be contaminated by an A/C system sealer should be treated as a contaminated system. A/C system flushing may not remove the system sealer from the system.

Using GM-approved (refrigerant-based) system flushing on A/C system contaminated with sealer products can introduce these sealer products to A/C service equipment which may cause equipment damage. Unapproved system flushing methods can leave unacceptable amounts of flushing agent in vehicle systems causing further damage. Component replacement may be necessary for correcting a vehicle system contaminated with system sealer products.

GM Service Operations recommends the use of only R-134a refrigerant for all vehicles manufactured since 1994. GM does not recommend blended refrigerant or hydrocarbon-based refrigerant. GM Service Operations recommends only the application specific compressor oil in the exact quantity specified for the application.