TM-9-2320-285-24-2

TRUCK TRACTOR, YARD TYPE, 43,500 LB GVW, DED, 4X2, ARMY MODEL M878A1

TECHNICAL MANUAL; ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

OCTOBER 1985

TM-9-2320-285-24-2 - Page 406 of 698

TM 9-2320-285-24-2

3-37.

HEATER TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2.

FRESH AIR DOOR WILL NOT OPEN OR CLOSE

Check heater housing for cracks, bent condition, bent or cracked fresh air door, or broken bellcrank.

If housing is cracked or bent, fresh air door is cracked or bent, or bellcrank is broken, replace

housing (para 3-38).

3.

WINDSHIELD WILL NOT DEFROST

Check for cracked, broken, or missing strap link.

Check for missing strap link nuts.

a. If strap link is cracked, broken, or missing, replace (para 3-38).

b. If strap link nuts are missing, replace (para 3-38).

3-400