521 / 948
FATC
33
a.
.
AIR FROM VENTS NOT COLD ENOUGH
TROUBLESHOOTING HINTS
Drive belt malfunction: Step 1
Malfunction in blower unit or condenser: Step 4, 5
Malfunction in receiver / drier, expansion valve ( valve close too much) or expansion valve heat-sensing tube
installed incorrectly: Step 8, 9
Malfunction in refrigerant lines: Step 10- 13
A/C compressor system malfunction, insufficient compressor oil: Step 16
Too much compressor oil, expansion valve heat-sensing tube installed incorrectly, or malfunction in expan-
sion valve or heater unit’s air mix link system: Step 18- 19
TROUBLE SHOOTING
Step
Inspection
Action
1
Inspect drive belt
See whether the belt is present or fitted
with correct tension.
Yes
Go to next step
No Adjust or replace drive belt.
2
Inspect refrigerant system performance
Perform refrigerant system performance
test (
Refer AC system performance test)
Is operating normal?
Yes
Operation is normal. (Recheck malfunction
symptoms.)
NO Go to next step
3
Verify whether malfunction is in blower
unit intake and condenser or another Are
refrigerant’s high-pressure and low pres-
sure values both high?
Yes Go to next step.
No Go to step 6.
4
Inspect blower unit intake Is blower unit
intake clogged
Yes
Remove obstruction.
(If air does not reach evaporator within cool-
ing unit, heat exchange does not occur,
refrigerant pressure becomes high, and there-
fore, removal of obstruction is necessary.)
No Go to next step
5
Inspect condenser
is it okay?
Yes
Adjust refrigerant to specified amount.
(Excessive amount of refrigerant.)
No
Replace condenser, or repair and clean con-
denser fins.
6
Verify whether malfunction is in expan-
sion valve,
receiver/drier and refrigerant lines or
elsewhere
Are refrigerant’s high-pressure and low-
pressure values low?
Yes Go to next step
No Go to step 14
7
Verify whether malfunction is in expan-
sion valve and receiver /drier or
elsewhere immediately after A/C com-
pressor operates, Does refrigerant’s high-
pressure value momentarily rise to cor-
rect value, then fall and stay below it?
(Is
there negative pressure on low-pressure
side?)
Yes Go to next step
No Go to step 10.