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HVAC
33
2. NO COOL AIR
TROUBLESHOOTING HINTS:
A/C compressor system malfunction - Step 2 or A/C switch system malfunction - Step 3, 4
Step
Inspection
Action
1
Inspect air blow out Does air
blow out?
Yes
Go to next step
No
Go to step 1 of troubleshooting indexes No. 1, 2
2
Inspect a/c compressor opera-
tion
Start engine Turn both A/C
switch and blower switch on.
Does A/C compressor operate?
Yes
Go to next step
No
Go to next step
3
Inspect a/c switch indicator light
Does a/c switch indicator light
illuminate
Yes
Go to step 5.
NO
Go to next step.
4
Inspect a/c switch Inspect A/C
switch is it okay?
Yes
Inspect wiring harness between climate control
unit and resistor.
No
Replace climate control unit.
5
Inspect a/c relay
(Coil-side)
In-
spect A/C relay. Is it okay?
Yes
Repair wiring harness between A/C relay and
PCM
(Terminal S).
No
Replace A/C relay.
6
Inspect a/c relay
(Switch-side)
Inspect A/C relay.
Is it okay?
Yes
Install A/C relay, then go to next step.
No
Replace A/C relay.
7
Verify whether malfunction is in
magnetic clutch and thermal pro-
tector or wiring harness
(Between a/c relay and magnetic
clutch)
Test voltage at magnetic clutch
connector terminal A
(A/C con-
trol signal)
. Is voltage
approximately 12 V?
Yes
Inspect magnetic clutch, If magnetic clutch is
normal Recheck malfunction symptoms, then
repeat from Step 1 if malfunction recurs.
If magnetic clutch is malfunctioning: Replace
compressor, then go to next step.
No
Repair wiring harness between A/C relay and
magnetic clutch, then go to next step.
8
Verify that malfunction symptom
occurs after repair
Does cool air blow out?
(Is re-
frigerant system performance
test result correct?)
Yes
Troubleshooting completed. Explain repairs to
customer.
No
Recheck malfunction symptoms, then repeat
from Step 1 if malfunction recurs.