Electric Fan Motor Test; Pressure Cap To Filler Neck Seal; Pressure Relief Check - Chrysler 1997 Stratus Convertible RHD Service Manual

TRANSMISSION FAN MODULE FASTENERS SINGLE FAN DRAINCOCK COOLER OIL
7 - 16 COOLING SYSTEM
DIAGNOSIS AND TESTING (Continued)
Fig. 17 Cooling Fan—JX

ELECTRIC FAN MOTOR TEST

Refer to Powertrain Diagnostic Manual for proce-
dure.
For wiring diagrams of the fan motor systems refer
to 8W Wiring Diagrams.
TESTING SYSTEM FOR LEAKS
With engine not running, wipe the coolant filler
neck sealing seat clean. The radiator should be full.
Attach a radiator pressure tester to the coolant
filler neck, as shown in (Fig. 18) and apply 104 kPa
(15 psi) pressure. If the pressure drops more than 2
psi in 2 minutes inspect all points for external leaks.
All hoses, radiator and heater, should be moved
while at 104 kPa (15 psi) since some leaks occur
while driving due to engine rock, etc.
Fig. 18 Pressure Testing Cooling System—Typical
If there are no external leaks after the gauge dial
shows a drop in pressure, detach the tester. Start
engine and run the engine to normal operating tem-
perature in order to open the thermostat and allow
the coolant to expand. Re-attach the tester. If the
needle on the dial fluctuates it indicates a combus-
tion leak, usually a head gasket leak.
WARNING: WITH TOOL IN PLACE PRESSURE
BUILDS UP FAST. ANY EXCESSIVE AMOUNT OF
PRESSURE BUILT UP BY CONTINUOUS ENGINE
OPERATION MUST BE RELEASED TO A SAFE
PRESSURE POINT. NEVER PERMIT PRESSURE TO
EXCEED 138 kPa (20 psi).
If the needle on the dial does not fluctuate, race
the engine a few times. If an abnormal amount of
coolant or steam is emitted from the tail pipe, it may
indicate a faulty head gasket, cracked engine block or
cylinder head.
There may be internal leaks which can be deter-
mined by removing the oil dip-stick. If water globules
appear intermixed with the oil it will indicate a
internal leak in the engine. If there is an internal
leak, the engine must be disassembled for repair.

PRESSURE CAP TO FILLER NECK SEAL

PRESSURE RELIEF CHECK

The pressure cap upper gasket (seal) pressure
relief can be checked by removing the overflow hose
at the radiator filler neck nipple (Fig. 19). Attach the
radiator pressure tester to the filler neck nipple,
and pump air into the system. The pressure cap
upper gasket should relieve pressure at 69-124 kPa
(10-18 psi), and hold pressure at 55 kPa (8 psi) min-
imum.
WARNING: THE WARNING WORDS DO NOT OPEN
HOT ON THE PRESSURE CAP IS A SAFETY PRE-
HOUSING/EN- THERMOSTAT GINE OUTLET CONNECTOR RUBBER SEALS VENT VALVE FILLER NECK OVERFLOW NIPPLE
CAUTION. WHEN HOT, THE COOLING SYSTEM
BUILDS UP PRESSURE. TO PREVENT SCALDING
OR OTHER INJURY, THE PRESSURE CAP SHOULD
NOT BE REMOVED WHILE THE SYSTEM IS HOT
AND/OR UNDER PRESSURE.
Fig. 19 Cooling System Pressure Cap to Filler Neck
There is no need to remove the pressure cap at any
time except for the following purposes:
• Check and adjust coolant freeze point
• Refill system with new coolant
STAINLESS-STEEL SWIVEL TOP GASKET RETAINER MAIN SPRING
JX