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**Wrenchbender Ret** · 10-19-2022, 10:25 PM

If you mean the coolant circulating in the heater core, it wont stop circulating unless there is a valve in one of the hoses. Preferably the hot water hose coming from the top of the engine. A lot of vehicles do not have a shutoff valve. Mostly the ones with the standard heater. The fan switch is the only control.

George

10-19-2022, 10:25 PM	#3
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,193	Re: Heater return flow If you mean the coolant circulating in the heater core, it wont stop circulating unless there is a valve in one of the hoses. Preferably the hot water hose coming from the top of the engine. A lot of vehicles do not have a shutoff valve. Mostly the ones with the standard heater. The fan switch is the only control. George