2003 JEEP GRAND CHEROKEE coil

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Page 2094 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual open circuit to the fuse in the junction block as
required.
(5) The coil ground terminal cavity (85) is switched
to ground through the Powertrain Control Module
(PCM). There should be continuity betwe

Page 2112 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual controlled vehicle accessories during periods of low
engine vacuum such as when the vehicle is climbing
a steep grade, or under other high engine load oper-
ating conditions.
The vacuum reservoir cann

Page 2118 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual HVAC HOUSING
REMOVAL
The HVAC housing assembly must be removed
from the vehicle and the two halves of the housing
separated for service access of the heater core, evap-
orator coil, blend door(s), and

Page 2131 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual ready. The refrigerant system should not be left open
to the atmosphere any longer than necessary. Cap or
plug all lines and fittings as soon as they are opened
to prevent the entrance of dirt and moi

Page 2133 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual (a) If the refrigerant system fails to reach the
specified vacuum, the system has a leak that must
be corrected. (Refer to 24 - HEATING & AIR CON-
DITIONING/PLUMBING - DIAGNOSIS AND
TESTING - REFRIGER

Page 2134 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual (10) Allow three to five minutes for the refrigerant
system to stabilize, then take a second set of thermo-
couple measurements. Record the temperature differ-
ence to determine if an additional charg

Page 2135 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual The high pressure relief valve vents only enough
refrigerant to reduce the system pressure, and then
re-seats itself. The majority of the refrigerant is con-
served in the system. If the valve vents r

Page 2138 of 2199

JEEP GRAND CHEROKEE 2003 WJ / 2.G Workshop Manual INSTALLATION
INSTALLATION
WARNING: REVIEW THE WARNINGS AND CAU-
TIONS IN THE FRONT OF THIS SECTION BEFORE
PERFORMING THE FOLLOWING OPERATION.
(Refer to 24 - HEATING & AIR CONDITIONING/
PLUMBING - WARN