Forum Discussion
wolfe10
Sep 27, 2015Explorer
A better option than leaving the cap off would be to "waste" $6 and get the lowest PSI cap that will fit for the trip home. Use a 2 quart or larger Gatorade or similar overflow bottle to catch anything that escapes the low pressure cap. Every morning before leaving, empty the Gatorade bottle into the reservoir.
Leaving a cap loose has too much chance of coming off and making a real mess.
Worse case is to drill a tiny hole in the OE cap so zero pressure builds. Replace with new when you are home.
Remember, pressurized systems are only used to raise the boiling point of coolant above that at atmospheric pressure. So, if no coolant/just water, 212 is the non-pressure boiling point. With 50/50 coolant it will be even higher.
So, no overheating, no problem with a non-pressure system.
Leaving a cap loose has too much chance of coming off and making a real mess.
Worse case is to drill a tiny hole in the OE cap so zero pressure builds. Replace with new when you are home.
Remember, pressurized systems are only used to raise the boiling point of coolant above that at atmospheric pressure. So, if no coolant/just water, 212 is the non-pressure boiling point. With 50/50 coolant it will be even higher.
So, no overheating, no problem with a non-pressure system.
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