Radiator Pressure Cap - Dodge Dakota Sport 2001 Service Manual

AN
RADIATOR (Continued)
Fig. 34 Transmission Oil Cooler Lines—Automatic
Transmission Only
1 - TRANSMISSION COOLER SUPPLY LINE
2 - TRANSMISSION OIL COOLER RETURN LINE
Fig. 35 Radiator Removal/Installation—Typical
1 - CORE SUPPORT
2 - LOWER ISOLATOR MOUNTS
3 - ISOLATOR PINS
4 - RADIATOR ASSEMBLY
5 - SCREWS
INSTALLATION
The radiator has two isolator pins on bottom of
both tanks. These fit into alignment holes in radiator
lower support (Fig. 35).
(1) Position isolator pins into alignment holes in
radiator lower support.
(2) Install and tighten radiator mounting bolts to
23 N·m (200 in. lbs.) (Fig. 35).
(3) Install the transmission oil cooler lines, (if
equipped).
(4) Connect fan motor electrical connector to har-
ness connector.
(5) Position upper fan shroud onto lower fan
shroud and radiator.
(6) Install retaining screws into shroud.
(7) Install radiator
reserve/overflow tank hose.
(8) Connect battery negative cable.
(9) Fill cooling system. (Refer to 7 - COOLING -
STANDARD PROCEDURE).
(10) Start and warm the engine. Check for leaks.

RADIATOR PRESSURE CAP

DESCRIPTION
All cooling systems are equipped with a pressure
cap (Fig. 36) in the radiator upper hose. This cap
releases pressure at some point within a range of
131-to-158 kPa (19-to-23 psi). The pressure relief
point (in pounds) is engraved on top of the cap
The cooling system will operate at pressures
slightly above atmospheric pressure. This results in a
higher coolant boiling point allowing increased radi-
ator cooling capacity. The cap contains a spring-
loaded pressure relief valve. This valve opens when
system pressure reaches the release range of 131-to-
158 kPa (19-to-23 psi).
A rubber gasket seals the radiator filler neck. This
is done to maintain vacuum during coolant cool-down
and to prevent leakage when system is under pres-
sure.
OPERATION
A vent valve in the center of the cap will remain
shut as long as the cooling system is pressurized. As
the coolant cools, it contracts and creates a vacuum
in cooling system. This causes the vacuum valve to
open and coolant in reserve/overflow tank to be
drawn through connecting hose into radiator. If the
vacuum valve is stuck shut, or overflow hose is
kinked, radiator hoses will collapse on cool-down.
ENGINE 7 - 49
hoses. reconnect coolant