POOR COOLING - DIAGNOSING/REPAIR A/C LEAKS CAT. 16, NO. 033/88
Article Text (p. 2)
1983 Mazda RX7
For www.iluvmyrx7.com
Copyright © 1998 Mitchell Repair Information Company, LLC
Monday, August 27, 2001 06:37AM
inch a second.
3. Whenever possible, the detector probe should be held underneath
the components since the refrigerant is heaver than air. (Fig. 2)
Fig. 2: Freon Detector Inspection Angle
HINT: Hold the electric leak detector probe near the drain hose.
Refrigerant from evaporator core may be detected through the water
drain hose.
INVESTIGATION & REPAIR
Most of the leaks from the pipe connection can be fixed with O-ring
replacement and proper torquing, but please pay attention to the
failure on pipe and components. (Fig. 3)
Fig. 3: Damaged Component Illustration
LEAK TEST
1. After replacing O-rings or components, evacuate the system at
least 10 minutes and hold the vacuum further 10 minutes.
2. If the vacuum does not drop, no leak is evident. Charge the
system with proper amount of refrigerant if it still leaks, check
for leak from cooling unit area.
3. Remove the cooling unit and look for the oil stain.
HINT: Before removing the cooling unit, charge the system with a
leak-detector-refrigerant which contains a dye. After operating the
system for a period of time, any leaks will be identified by a dye
stain around the leaking area.
REPAIR
Replace the O-ring at the expansion valve connection, or evaporator
core.
