REPLACE ENGINE COOLANT HEATER
THIS WORK PACKAGE COVERS:
Removal (page 0477 00-1).
Installation (page 0477 00-3).
Tools and Special Tools
General Mechanics Tool Kit (WP 0541 00, Item 57)
See your -10
Engine stopped (see your -10)
Carrier blocked (see your -10)
Battery negative lead(s) disconnected (WP 0292 00)
Top left access grille removed (see your -10 or
WP 0390 00)
Removal procedures for M548A1 and M548A3 engine coolant heater are similar. M548A3
coolant heater does not have a cover. M548A1 coolant heater is shown.
For M548A1, do Step 2.
Turn off coolant valve (1) and coolant valve (2).
Remove two screws (3) and washers (4) that secure heater cover plate (5) to mounting bracket (6). Remove plate.
Disconnect engine inlet and plate outlet coolant hoses from engine coolant heater (WP 0476 00).