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The radiator cap when bad will allow pressure to go back to the overflow bottle, after that check your thermostat. The coolant system should be pressurized when warm, so much so that the hoses feel hard when squeezed. The radiator cap is made to release the pressure when it becomes too great, if your cap is worn out the pressure will release too early and pressure will blow out to the coolant bottle.

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Q: Your coolant system builds up great pressure you have put a new water pump on as well as a radiator Yet there's still enough pressure to prevent you from opening the coolant bottle of your Ford Escort?
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