is the water control valve necessary on a 1997 buickpark avenue
there is a backflow valve in the inlet to the heater on this car. I believe it is called a "water flow control valve". Mine has discinerated while I was replacing the intake manifold bypass asm ( aslo called the belt tensioner asm).
That is part of your heater system. It shuts of the hot coolant going to the passanger compartment when the a/c is on. If you live in a cool/cold area you need the valve to work or you will not have heat in the winter. You could replace it with a manual valve that you shut off in the summer and turn on in the winter.....up to you
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