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Which way to bypass heater core

6K views 9 replies 6 participants last post by  Dukedkt442 
#1 ·
I'm looking to bypass my heater core but I don't want to go with the vacuum line route. I'm wondering if just putting a manual ball valve on both hoses and having them closed is safe for the motor? Or is it safer to just connect both hoses together?
 
#7 ·
What do you mean? You shouldn't have to worry about air bubbles unless you have a coolant leak.
 
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