Proheat X45–School Bus - Manual (Page 86)

5-29 SECTION 5. TROUBLESHOOTING & REPAIR
Symptom: Coolant pump not running (no code indicated)
Fuse blown in PCM
Check: Coolant Pump function
a) Harness for pinched or abraded wires. Positive lead
must not short to ground.
b) Check motor for internal short.
(See Figure 5-24 and Test Procedure.)
Symptom: Coolant pump not pumping (no code indicated)
Check: Coolant Pump function
a) If the impeller is turning freely. If not, replace pump.
Symptom: Coolant pump leaking
Check: Leak location
a) Hose clamps. Tighten if necessary.
b) Pump housing seal. Replace pump if required.