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![]() TM 5-2420-222-20-1 
ENGINE COOLANT HEATER HOSES AND FITTINGS (OPTIONAL) 
This task covers: 
a. 
Removal (page 2-362) 
d.  Inspection/Replacement (page 2-364) 
b. 
Disassembly (page 2-364) 
e. 
Assembly (page 2-365) 
c. 
Cleaning (page 2-364) 
f. 
Installation (page 2-366) 
INITIAL SETUP: 
Tools 
Materials/Parts - Continued 
Container, 5-gallon 
Rags, wiping (item 21, Appendix C) 
Key, socket-head screw, 114-inch 
Solvent, drycleaning (item 28, Appendix C) 
Screwdriver, flat-tip, 3/16-inch 
Vise, machinist's 
Personnel Required 
Wrench, open-end, 9116inch 
Wrench, pipe, adjustable, 
One 
1/4 to 1-inch 
Equipment Condition 
Materials/Parts 
Radiator drained (page 2-368) 
Detergent, GP (item 7, Appendix C) 
ACTION 
LOCATION 
ITEM 
REMARKS 
REMOVAL 
1. 
Lower hose (1) 
Clamp (2) 
a. Put 5-gallon container underneath to 
catch draining coolant. 
b. Using 3116-inch flat-tip screwdriver, 
loosen. 
2. 
Engine coolant 
Lower hose (1) 
a. Pull off. 
heater (3) 
with assembled 
b. Drain coolant into 5-gallon container. 
clamp (2) 
c.  Get rid of drained coolant 
(page 2-137). 
3. 
Lower hose (1) 
Clamp (4) 
Using 3/16-inch flat-tip screwdriver, 
loosen. 
4. 
Tube nipple (5) 
Lower hose (1) 
Pull off. 
with assembled two 
clamps (2 and 4)x 
2-362 
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