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AIRCONDITIONING
3. Refrigerant Fails to Circulate
(Cycle Is Clogged Up)
Problem
Cause
Check and
remedy
1 when completely
clogged up
-Check receiver, ex-
Vacuum is imme-
pansion valves,
diately indicated
EPR, etc.
on the low pressu-
-A temperature dif-
re side.
Clogging of
ference occurs be-
A/C cycle
tween IN and OUT
2. When slightly
of the defective
clogged up
parts.
Vacuum is gradu-
-Be Sure to evacu-
ally indicated on
ate the air after fin-
the low pressure
ishing the remedy.
side
4. Moisture Entered in the Cycle
Problem
Cause
Check and
remedy
1. The air condi-
tioner operates
Freezing of
-Check the expan-
normally at the expansion sion valve, etc.
beginning, but
valve from -Replace receiver
over time, vac-
the press-
(or dryer)
uum is indicated ence mois-
Be sure to evacu-
on the low pres-
ture
ate the air after fin-
sure side.
ishing the remedy.
5. Compressor Compression Failure
Problem
Cause
Check and
remedy
1. Pressure on low
-Check compressor
pressure side is
- in the case of a
high; pressure on
compression mal-
high pressure
function of the
side is low.
Compressor
compressor (the
2. When the A/C is defect
compressor is not
turned off the
hot to the touch)
low and high
pressure sides
soon equalize.
Caution
With a variable capacity type compressor, it is easy to
mistake compression failure depending on several
variable conditions. therefore, per- from troubleshooting
by following the test procedure for the capacity
compressor.
Fig. 55 - Refrigerant fails to circulate
Fig. 56 - Moisture entered in cycle
Fig. 57 - Compressor compression failure