building up radiator pressure and blowing radiator, upper hose very hard. Replaced water pump, thermostat and now third radiator. What could be the cause?

Asked by Jun 13, 2017 at 10:17 PM about the 2002 Dodge Grand Caravan 4 Dr Sport Passenger Van Extended

Question type: Maintenance & Repair

3 Answers

1,830

leaking headgasket is my first bet. If your radiator is over- pressurizing, check fluid levels. When does it blow? When idle? When at higher RPMs?

1 of 1 people found this helpful.
91,925

Replace the radiator cap in case it is holding too much pressure.

1 of 1 people found this helpful.
73,935

Yes, the radiator cap is like a safety valve. It should blow off the excess pressure long before the radiator blows apart! Usually around 16 PSI. HTH. -Jim

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