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Dave in MN · 11-21-2018, 12:51 PM

The zero pressure cap on the closed system neck will work good. The water that moves to the overflow tank will draw back into the radiator with the zero pressure cap. I have the system you have described with the zero pressure cap in a recently built car and have driven it about 7,000 miles. Some of the driving was to Branson this past summer where the temps were close to 100 degrees.
Good Day!

11-21-2018, 12:51 PM	#2
Dave in MN Senior Member Join Date: May 2010 Location: Jordan, MN Posts: 1,416	Re: pressurized radiator work around The zero pressure cap on the closed system neck will work good. The water that moves to the overflow tank will draw back into the radiator with the zero pressure cap. I have the system you have described with the zero pressure cap in a recently built car and have driven it about 7,000 miles. Some of the driving was to Branson this past summer where the temps were close to 100 degrees. Good Day!