2
TM 5-3805-291-23-2
HEATER CORE REPLACEMENT
THIS WORK PACKAGE COVERS
Removal, Installation
INITIAL SETUP
Maintenance Level
Personnel Required
MOS 62B, Construction Equipment Repairer
Direct Support
Equipment Conditions
Tools and Special Tools
Steering frame lock connected (TM 5-3805-291-
Tool kit, general mechanic's, automotive (Item 90,
10)
AC system recovered (WP 0222 00)
Shop equipment, automotive maintenance and
Lower housing removed from heater assembly (WP
repair: field maintenance, basic, less power (Item
68, WP 0232 00)
Drawings Required
Materials/Parts
TM 5-3805-291-23P, Figure 176
Rag, wiping (Item 35, WP 0233 00)
Estimated Time to Complete Task
Heater core
4.0 hr
REMOVAL
C AU T I O N
Wipe area clean around all connections to be opened during removal. Cap lines and hoses and plug
openings after removing lines. Contamination of system could result in premature failure.
Use two line wrenches to avoid damage to fittings.
Care must be taken to ensure fluids are contained during performance of inspection, maintenance,
testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers
before opening any compartment or disassembling any component containing fluids.
Dispose of all fluids according to local regulations and mandates.
N OT E
Use a container to catch any fluid that may drain from hoses or system. Dispose of fluid IAW local pol-
icy and ordinances. Ensure all spills are cleaned up.
Refrigerant is odorless. As a result, all of it may leak away and not be noticed until system stops cool-
ing. All vehicle refrigerant systems lose some refrigerant depending on the condition of system. Higher
loss rates signal a need to locate and repair leaks.
Leaks are most often found at the compressor hose connections and at various fittings and joints in sys-
tem. If unapproved replacement hoses are installed, refrigerant can be lost through hose permeation.
