Radiator Pressure Cap Description - Jeep 2002 WJ Service Manual

WG
RADIATOR FAN (Continued)
Fig. 12 HYDRAULIC LINES/HOSES AND
ELECTRICAL CONNECTOR
1 - LOW PRESSURE RETURN HOSE
2 - HIGH PRESSURE LINE (OUTLET)
3 - HIGH PRESSURE LINE (INLET)
4 - HYDRAULIC FAN DRIVE
(10) Install radiator upper hose.
(11) Connect electrical connector for hydraulic fan
control solenoid and assure ECM ground to fan
assembly.
(12) Tighten fan shroud upper mounting bolts to 6
N·m (50 in. lbs.).
(13) Refill cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
CAUTION: Do not run engine with power steering
fluid below the full mark in the reservoir. Sever
damage to the hydraulic cooling fan or the engine
can occur.
(14) Refill power steering fluid reservoir and bleed
air from steering system (Refer to 19 - STEERING/
PUMP - STANDARD PROCEDURE).
(15) Run engine and check for leaks.
RADIATOR PRESSURE CAP
DESCRIPTION
all vehicle are equipped with a pressure cap (Fig.
13). This cap releases pressure at some point within
a range of 124-to-145 kPa (18-to-21 psi). The pres-
sure 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 124-to-
145 kPa (18-to-21 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.
Fig. 13 Radiator Pressure Cap - Typical
1 - FILLER NECK SEAL
2 - VACUUM VENT VALVE
3 - PRESSURE RATING
4 - PRESSURE VALVE
ENGINE 7a - 19