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I think

October 7 2017 at 2:49 PM
eric  (Login wwyin62)
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Response to 428 over pressurized expansion tank

you just over filled it. when cold you only need to cover the bottom of the tank maybe 3/4 of an inch. Doubt you are getting compression in the system as it would lose pressure over night & fill a cyl. If you have a tight system it will retain pressure over night especially if the tank was filled to the top. I'm always amazed when I relieve the pressure on mine when it's hot, the expansion tank deflates like a balloon. Your coolant needs a place to go when it is hot and expands, if you had it full to the top of the tank, that's why it blew the hose off.

 
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