Service Ports/Access Valves

The primary seal for the service ports is a sealing cap. The cap contains an O-ring or gasket that provides a leak-free seal. The following conditions will cause a refrigerant loss:
^ A loose cap
^ A missing cap
^ An incorrect cap

Evaporator Core
One of the most difficult leaks to find is in the evaporator core. Complete the following steps in order to test the core for leaks:
1. Turn the blower on HI for 15 or more seconds. Turn the blower off.
2. Wait 10 minutes.
3. Remove the HVAC filter access door and the HVAC filters.
4. Insert the leak detector probe into the opening. Try to get as close to the evaporator as possible.
5. A solid alarm on the detector indicates a leak.

Compressor Block Fitting and Shaft Seal
1. Blow compressed air into the following locations for at least 15 seconds:
^ Behind the compressor clutch/pulley
^ In front of the compressor clutch/pulley
2. Wait 1 - 2 minutes.
3. Probe the area in front of the pulley.
4. A solid alarm on the detector indicates a leak.