Heater Core - Chrysler PT Cruiser Service & Repair Manual

PT
CONDENSATION DRAIN TUBE (Continued)
INSTALLATION
(1) Squeeze the retaining clamp and install the
tube over the nipple.
(2) Lower the vehicle.

HEATER CORE

DESCRIPTION
Fig. 55 Heater Core
1 - LOWER HEATER-A/C UNIT HOUSING
2 - HEATER CORE HOSE NIPPLES
3 - HEATER CORE
The heater core (Fig. 55) is located in the heater-
A/C unit housing, under the instrument panel. It is a
heat exchanger made of rows of tubes and fins. One
end of the core is fitted with a molded plastic tank
that includes the integral heater core hose nipples.
OPERATION
Engine coolant is circulated through heater hoses
to the heater core at all times. As the coolant flows
through the heater core, heat removed from the
engine is transferred to the heater core fins and
tubes. 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 temperature
by controlling how much of the air flowing through
the heater-A/C housing is directed through the
heater core. The blower motor speed controls the vol-
ume of air flowing through the heater-A/C housing.
The heater core cannot be repaired and, if faulty or
damaged, it must be replaced. Refer to Cooling Sys-
tem for more information on the engine cooling sys-
tem, the engine coolant and the heater hoses.
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO PASSIVE RESTRAINT SYSTEMS
HEATING & AIR COND. - LHD
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL
COMPONENT DIAGNOSIS OR SERVICE. FAILURE
TO TAKE THE PROPER PRE-CAUTIONS COULD
RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
WARNING: DO NOT OPEN THE RADIATOR DRAIN-
COCK OR DISCONNECT COOLANT HOSES WHEN
THE SYSTEM IS HOT AND UNDER PRESSURE.
SERIOUS BURNS FROM COOLANT CAN OCCUR.
(1) Disconnect the negative battery cable.
(2) Drain the cooling system(Refer to 7 - COOL-
ING/ENGINE - STANDARD PROCEDURE).
(3) Evacuate the refrigerant system(Refer to 24 -
HEATING & AIR CONDITIONING - STANDARD
PROCEDURE).
(4) Remove the instrument panel(Refer to 23 -
BODY/INSTRUMENT
PANEL ASSEMBLY - REMOVAL).
(5) Remove the refrigerant lines from the evapora-
tor connections.
(6) Remove the heater core coolant supply hoses
from the heater core (Fig. 56).
Fig. 56 Heater Core Coolant Supply Lines
1 - HEATER CORE COOLANT LINE SUPPORT BRACKET BOLTS
2 - HEATER CORE COOLANT SUPPLY LINES
(7) Working from inside the engine compartment,
remove the A/C-heater housing retaining fateners
from the bulk head.
(8) Remove the A/C-heater housing drain tube.
Remove the spring clip from the A/C-heater housing
and body attachement point.
24 - 43
PANEL/INSTRUMENT