Town & Country V6-3.8L VIN L (2006)
Radiator Cap: Testing and Inspection
COOLING SYSTEM PRESSURE CAP TESTING
Fig. 33 Testing Cooling System Pressure Cap
Dip the pressure cap in water. Clean any deposits off the vent valve or its seat and apply cap to end of the Pressure Cap Test Adaptor that is included
with the Cooling System Tester 7700 (Fig. 33). Working the plunger, bring the pressure to 104 kPa (15 psi) on the gauge. If the pressure cap fails to
hold pressure of at least 97 kPa (14 psi), replace the pressure cap.
CAUTION: The Cooling System Tester Tool is very sensitive to small air leaks that will not cause cooling system problems. A pressure cap that
does not have a history of coolant loss should not be replaced just because it leaks slowly when tested with this tool. Add water to the tool. Turn tool
upside down and recheck pressure cap to confirm that cap is bad.
If the pressure cap tests properly while positioned on Cooling System Tester (Fig. 33), but will not hold pressure or vacuum when positioned on the
filler neck. Inspect the filler neck and cap top gasket for irregularities that may prevent the cap from sealing properly.
RADIATOR CAP TO FILLER NECK SEAL
Fig. 34 Radiator Pressure Cap Filler Neck
The pressure cap upper gasket (seal) pressure relief can be checked by removing the overflow hose at the radiator filler neck nipple (Fig. 34). Attach
the Radiator Pressure Tool to the filler neck nipple and pump air into the radiator. Pressure cap upper gasket should relieve at 69 - 124 kPa (10 - 18
psi) and hold pressure at 55 kPa (8 psi) minimum.
WARNING: The warning words do not open hot on the radiator pressure cap is a safety precaution. When hot, pressure builds up in cooling
system. To prevent scalding or injury, the radiator cap should not be removed while the system is hot or under pressure.