Description; Operation; A/C Expansion Valve; Heater Core - Chrysler Sebring 2005 Service Manual

24 - 72 PLUMBING
A/C EXPANSION VALVE (Continued)
Fig. 17 A/C Expansion Valve
1 - EVAPORATOR SEAL

2 - A/C EXPANSION VALVE

3 - HVAC HOUSING
4 - HEATER CORE TUBES
5 - HVAC HOUSING STUD
6 - HVAC HOUSING STUD
7 - EXPANSION VALVE BOLT (2)
are made of a special material for the R-134a system.
Use only refrigerant oil of the type recommended for
the A/C compressor in the vehicle.
(3) Install the A/C expansion valve onto the evap-
orator tube tapping plate.
(4) Install the two bolts that secure the A/C expan-
sion valve to the evaporator tube tapping plate.
Tighten the bolts to 11 N·m (97 in. lbs.).
(5) Remove the tape or plugs from the suction and
liquid line fittings.
(6) Lubricate new O-ring seals with clean refriger-
ant oil and install them onto the suction and liquid
line fittings. Use only the specified seal as it is made
of a special material for the R-134a system. Use only
refrigerant oil of the type recommended for the A/C
compressor in the vehicle.
(7) Connect the A/C suction line and the A/C liquid
line to the A/C expansion valve.
(8) Install the nut that secures the refrigerant line
tapping plate to the A/C expansion valve. Tighten the
nut to 23 N·m (17 ft. lbs.).
(9) Position the refrigerant line retainer bracket to
the right shock tower and install the bolt securely.
(10) Evacuate the refrigerant system (Refer to 24 -
HEATING & AIR CONDITIONING/PLUMBING -
STANDARD PROCEDURE - REFRIGERANT SYS-
TEM EVACUATE).
(11) Charge the refrigerant system (Refer to 24 -
HEATING & AIR CONDITIONING/PLUMBING -
STANDARD PROCEDURE - REFRIGERANT SYS-
TEM CHARGE).

HEATER CORE

DESCRIPTION

The heater core (Fig. 18) is located in the HVAC
housing, behind the instrument panel. The heater
core is a heat exchanger made of rows of tubes and
fins. The heater core tubes are attached to the side of
the heater core and cannot be serviced separately.
Fig. 18 Heater Core
1 - HEATER CORE
2 - INLET TUBE
3 - OUTLET TUBE

OPERATION

Engine coolant is circulated through the heater
hoses to the heater core at all times. As the coolant
flows through the heater core, heat is removed from
the engine and is transferred to the heater core tubes
and fins. Air directed through the heater core picks
up the heat from the heater core fins. The blend-air
door allows control of the heater output air tempera-
ture by regulating the amount of air flowing through
the heater core. The blower motor speed controls the
volume of air flowing through the HVAC housing.
The heater core cannot be repaired and, if faulty or
damaged, it must be replaced.
JR