TM 5-3810-307-24-1-1
HEATER (CARRIER CAB)
Removal
a.
Ensure battery disconnect switch is in the OFF position.
b.
Remove capscrews (1, Figure 2-1-5) and heater vent (2) from inside of cab.
c.
Disconnect electrical connector for heater motor.
d.
Remove screw (3) and clamp (4) securing outer casing of defroster control cable to bottom of heater
plenum.
e.
Disconnect defroster control cable from heater flap lever at bottom of heater plenum.
f.
Remove screw (5) and clamp (6) securing outer casing of heat control cable, and disconnect heat control
cable from shutoff valve (17).
g.
Loosen clamp (7) and disconnect defroster duct (8) from side of heater plenum.
WARNING
Engine must be cool to the touch prior to working on coolant system components.
Failure to comply could result in scalding or serious burns.
h.
Place suitable container under heater hoses to catch residual coolant, loosen clamps (9), and remove
heater hoses (10 and 11) from elbows on side of heater (14).
i.
Remove capscrews (12), star washers (13), and heater (14) from bottom of cab.
j.
If necessary, loosen clamps (15) and remove shutoff valve (17) from hoses (11 and 16).
Repair
a.
Disassemble heater (14, Figure 2-1-5) as necessary to replace damaged or defective parts.
(1)
Remove screws (18), star washers (19), and lift cover (20) with coil (21) from case (26).
(2)
Remove coil (21) with grommet (22) from cover (20), and grommet (21) from tubes of coil (21).
(3)
Remove screws (23), star washers (24), and blower housing (25) from case (26).
(4)
Remove screws (27), star washers (28), and motor (29) from blower housing (25).
(5)
Loosen setscrew in retainer (30), and remove retainer and fan wheel (31) from shaft of motor (29).
b.
Assemble heater (14, Figure 2-1-5) as necessary.
(1)
Install fan wheel (31) on shaft of motor (29) with retainer (30).
(2)
Install motor (29) on blower housing (25) with star washers (28) and screws (27).
(3)
Install blower housing (25) on case (26) with star washers (24) and screws (23).
(4)
Install grommet (22) on tubes of coil (21), and coil (21) with grommet (22) on cover (20).
2-1-21
