ENGINE
TABLE OF CONTENTS
page page
COOLANT
DESCRIPTION............................6
HEATER SUPPLY/RETURN TUBES
REMOVAL ...............................6
INSTALLATION............................6
RADIATOR FAN
REMOVAL ...............................7
INSTALLATION............................8
COOLANT
DESCRIPTION
CAUTION: Use of Propylene Glycol based coolants
is not recommended, as they provide less freeze
protection and less corrosion protection.
Do not mix coolant types. If coolant other than
MoparT Antifreeze/Coolant, 5 Year/100,000 Mile For-
mula or equivalent is added, the mixed coolant will
have a reduced service schedule.
The use of aluminum cylinder heads, and water
pumps requires special corrosion protection. Mopart
Antifreeze/Coolant, 5 Year/100,000 Mile Formula or
equivalent ethylene glycol based coolant with corro-
sion inhibitors (called HOAT, for Hybrid Organic
Additive Technology) is recommended. This coolant
offers the best engine cooling without corrosion when
mixed with 50% Ethylene Glycol and 50% distilled
water to obtain a freeze point of -37°C (-35°F). If it
loses color or becomes contaminated, drain, flush,
and replace with fresh properly mixed coolant solu-
tion. Mixing of coolants other than specified (non-
HOAT), will reduce the 5 year/100,000 mile corrosion
protection.
HEATER SUPPLY/RETURN
TUBES
REMOVAL
(1) Disconnect negative battery cable. Disconnect
positive battery cable. Remove battery.
(2) Raise vehicle on hoist.
(3) Drain cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
(4) Remove hose clamp from heater return tube
located near starter. Disconnect hose from tube.
(5) Lower vehicle
(6) Remove air cleaner housing and throttle body
to intake manifold hose.
(7) Disconnect PCV vacuum hose at intake mani-
fold.
(8) Remove hose clamp from heater supply tube
located near thermostat housing. Disconnect hose
from tube.
(9) Remove two heater hose clamps and disconnect
heater hoses near battery.
(10) Unclip wiring harness from heater tube
assembly.
(11) Remove transmission dipstick tube and place
an appropriate plug into hole to prevent coolant from
entering transmission.
(12) Remove fasteners attaching heater tube
assembly to cylinder head and engine block.
(13) Remove heater tube assembly.
NOTE: After heater tube assembly is removed, the
short hoses connecting the tubes to the thermostat
housing and water pump inlet tube can be replaced
at this time.
INSTALLATION
(1) Inspect all hoses that connect to heater tubes.
Replace if necessary.
(2) Position heater tube assembly near it’s mount-
ing location.
(3) Connect hoses at water pump inlet tube and
thermostat housing. Ensure clamps are positioned
properly to seal hoses and avoid contact with engine
components.
(4) Install fasteners attaching heater tube assem-
bly to cylinder head and engine block.
NOTE: Before installing transmission dipstick tube
clean any residual coolant from around the area
where plug was placed.
(5) Remove plug from transmission dipstick tube
mounting hole. Install transmission dipstick tube.
(6) Reattach wiring harness to heater tube assem-
bly.
7s - 6 ENGINE PL
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