TM 5-3805-292-23
0006
CHASSIS TROUBLESHOOTING - INSUFFICIENT/NO HEAT IN CAB CONTINUED
AH
Check for continuity between electric
water valve assembly connector
Continuity
Perform Open Harness Test for
HVC2-C, circuit 000C (B), harness
NO
present?
circuit 000 (WP 0173).
5. HVAC).
YES
With engine off and heat on high,
measure voltage between electric
water valve assembly connector
Voltage
Replace electric water valve
YES
HVC2-D, circuit 006 (Y), harness
present?
assembly (WP 0100).
5. HVAC).
NO
Disconnect HVAC temperature
control switch (WP 0153).
Push power button to turn on
machine power (TM 5-3805-292-10).
Voltage
Perform Open Harness Test for
Measure voltage between HVAC
NO
present?
circuit 001 (WP 0173).
temperature control switch connector
HVC3-1, circuit 001D (R), harness
5. HVAC).
YES
Check for continuity between HVAC
temperature control switch connector
Continuity
Perform Open Harness Test for
HVC3-3, circuit 000E (B), harness
NO
circuit 000 (WP 0173).
present?
5. HVAC).
YES
Check for continuity between HVAC
temperature control switch connector
Reconnect electric water valve (WP
HVC3-2, circuit 006 (Y), harness
Continuity
0100) and HVAC temperature control
side, and electric water valve
NO
switch (WP 0153). Perform Open
present?
assembly connector HVC2-D, circuit
Harness Test for circuit 006 (WP 0173).
006 (Y), harness side (WP 0175,
Frame 5. HVAC).
YES
Reconnect electric water valve (WP
0100). Replace HVAC temperature
control switch (WP 0153).