Owner's Manual

MTC-70
TROUBLE DIAGNOSIS
Revision: March 2005 2005 Altima
Low-pressure Side Becomes Negative
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side becomes nega-
tive.
Liquid tank or front/rear side of
expansion valve's pipe is
frosted or dewed.
High-pressure side is closed
and refrigerant does not flow.
↓
Expansion valve or liquid tank
is frosted.
Leave the system at rest until
no frost is present. Start it
again to check whether or not
the problem is caused by
water or foreign particles.
● If water is the cause, initially
cooling is okay. Then the
water freezes causing a
blockage. Drain water from
refrigerant or replace refrig-
erant.
● If due to foreign particles,
remove expansion valve
and remove the particles
with dry and compressed air
(not shop air).
● If either of the above meth-
ods cannot correct the prob-
lem, replace expansion
valve.
● Replace desiccant assem-
bly.
● Check lubricant for contami-
nation.
AC362A