TM 5-3805-281-24-1
System Operational Checks
3 HEATER AND AIR CONDITIONER CIRCUIT CHECKS
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BLOWER MOTOR 20
Remove fuse block cover.
YES: Fuse is OK.
AMP FUSE (F13) CHECK
Remove fuse from fuse block.
NO: Replace fuse. If fuse
blows again, check for
Using ohmmeter, check fuse for continuity.
short.
Is continuity measured?
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Remove fuse block cover.
A/C CONTROLLER AND
YES: Fuse is OK.
RELAYS 5 AMP FUSE
(F14) CHECK
Remove fuse from fuse block.
NO: Replace fuse. If fuse
blows again, check for
Using ohmmeter, check fuse for continuity.
short.
Is continuity measured?
9031
10
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5
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?
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