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Old 06-13-2023, 07:24 PM   #4
PbFut
Senior Member
 
Join Date: Feb 2022
Location: Ca
Posts: 715
Re: Coolant valve operation ?

It is a normally open valve unless ac triggers it to close. The intent is to allow for some bypass of the tstat to avoid hot spots in the heads during warm up until the tstat opens some. Not a issue in summer as the stat opens pretty fast in warm weather so ok if ac is on at start up in summer. Not a good idea use a ball valve though it is often done.
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