ORGANIZATIONAL TROUBLESHOOTING - Continued
STEWART-WARNER 10560C24, 10560M, 10560M24B1, 10660G - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. HEATER DOES NOT START BELOW 40°F (4°C) - Continued
Step 8. Remove thermostat lead (1) from terminal 3 of terminal strip (2).
Step 9. Check heat element inside fuel control valve (3) by placing multimeter leads across
heating element terminal (4) and ground.
If multimeter reading is less than 5.5 ohms or more than 6.5 ohms, remove
heater from vehicle and send to Direct Supoort Maintenance for fuel control
valve servicing.
Step 10. Connect a jumper wire across terminals of thermostat (5).
Step 11. Reconnect thermostat lead (1) to terminal 3 of terminal strip (2), turn heater on, and wait
a few minutes.
If valve does not become warm to the touch, replace valve thermostat (page
2-55).
Step 12. Try to start heater below 40°F (4°C) (page 2-59).
a. If heater does not start, notify Direct Support Maintenance.
b. If heater starts, install guard (page 2-42).
2-28
TM 9-2540-205-24&P
