In my case, just turning off the fan reduces the heat output to where it is not noticeable.  One thing I will mention, I fly without an engine coolant thermostat and when its cold outside – guess what?  Yep! The coolant gets – well, not cold, but does not provide much heat.  But, then when it gets that cold I generally stay by the fireplace {:>)

 

Ed

 

 

Ed, I agree with you … if the core is leaking, it should be isolated … it will leak it’s contents but no more.

Most people just want one valve to turn off the in-flow when heat isn’t needed – that’s what I did on a previous installation.

Jeff

 

 

Same Valve I installed over 15 years ago – works fine with a pull cable.  But, again if you do not have the means for shutting off the coolant flow in both hoses, a leak in your system will end up dripping into your cockpit.  OR you at least need  a check-valve in the out-flow line to keep coolant from coming back in that way.

 

OR am I missing something – everyone seems focused on only one valve?

 

Ed

 

 

I used something like this for controlling my heater water flow:

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