TM 5-3805-280-24-1
System Operational Checks
AIR CONDITIONER
Disconnect harness from relay.
YES: Relay is OK.
RELAY (K24, K25, K26,
K27 AND K28) CHECK
Connect 24 volts to relay terminal 1 and ground terminal
NO: Relay has failed.
2.
Replace.
Does relay click?
Connect ohmmeter to terminals 3 and 4.
T118624 UN23NOV98
Does ohmmeter read continuity?
1/1
AIR CONDITIONER HIGH
Disconnect harness from switch.
YES: Switch is good.
AND LOW PRESSURE
SWITCH (B27) CHECK
Check for continuity between terminals.
NO: Go to High and Low
Pressure Switch Test,
Is continuity measured?
Group 9031-25.
T101619 1913JUN96
1/1
Disconnect harness from blower motor.
YES: Blower motor is
A/C AND HEATER
good. Check wiring
BLOWER MOTOR (M6)
harness.
CHECK
Ground blk/red wire terminal in connector. Connect 24 volts to red/wht wire terminal in
connector.
NO: Replace blower
9031
motor.
Does blower motor operate in high speed?
10
7
1/1
AIR CONDITIONING
Disconnect harness from clutch.
YES: A/C compressor
COMPRESSOR CLUTCH
clutch coil is good. Check
(Y1) CHECK
wiring harness.
Connect battery voltage to clutch terminal that has
black/yellow wire. Ground black wire terminal.
NO: Replace clutch coil.
Does Clutch "click"?
T6534CV
UN19OCT88
1/1
7-16
