There may be a loss of air conditioning, weak cooling or warm air coming out of the vents on some 2024-2025 Silverado 1500 and Sierra 1500 trucks.
These conditions may be due to the desiccant chamber of the air conditioning condenser.
Check for scoring (Fig. 7, red arrows) on the inside of the desiccant chamber, which may cause a slow leak of refrigerant at the receiver/dryer desiccant cap.
Fig. 7
Inspect the cap extensively using a refrigerant sniffer (GE-50078 Electronic Leak Detector) or a soapy solution to identify any leaks. Replace the condenser if a leak is found. (Fig. 8, condenser (#1) and radiator (#2) – L84/L87 engines) Refer to Air Conditioning Compressor Replacement in the appropriate Service Information.
Fig. 8
On vehicles equipped with the 2.7L engine (RPO L3B) or 3.0L diesel engine (RPO LZ0), remove the charge air cooler, condenser, fan motor and radiator as an assembly. (Fig. 9)
Fig. 9
On vehicles equipped with the 5.3L or 6.2L engine (RPO L84, L87), remove the condenser, fan motor, radiator and transmission fluid auxiliary cooler, if equipped, as an assembly. (Fig. 10)
Fig. 10
Refer to Bulletin #25-NA-170 for more details, including the plant code and condenser part number.
Thanks to Dave MacGillis
