Radiator Hose Valve?

Question:
I’m about to install my new summit heater. During summer driving, will the heater core emit heat from the heater if the fan is not on? Or do I install a bypass valve and hose to shut off coolant to the core?

 

Yup. That makes sense.

I guess I’ll order some valves

thanks for your input.

 

Are we discussing F head applications? One I recently acquired had a remote shutoff of some kind installed. It appears the operator could turn flow to the core on or off from inside the cab. I'm going to need to look again but I think there wasn't an obvious bypass installed when the valve was closed. I wonder if that caused cooling issues for the head.

 

yes, F head.
Yes, my rig came with an in cab knob that actuated a lever to control an in-line valve for the coolant hose. I guess it was a function of the heater? Mine was leaking so I removed it.

 

Does yours have the small bypass between the waterpump and the head?

 

I took a closer look at it. It's a 1962 CJ-5. It is equipped with the 3 pull knob heater control, one of which is a valve on the line to the heater. So when that's closed the flow from rear passenger side of head to water pump is shutoff. It does not have the small bypass on the front (nor is the water pump equipped with a port in that location).
Interestingly I have another engine that was heater equipped that does have the little bypass on the front.

I ask because I plan to remove the heater on my M38A1. It's a civilian CJ5 heater with no ducting and the vehicle is never going to have a top. I just want to remove the needless weight and complexity. Right now it has no shutoff. So my options are to run bypass hose where the heater flow used to be (unsightly), run the small front bypass (I think it's equipped but not currently installed), or plug everything.

 

To my knowledge, the heater core was never designed as part of the cooling system, but as an add on.
Ford ran a cable operated inline heater valve for years. They are cheap and plentiful.
https://i.ebayimg.com/images/i/310234390594-0-1/s-l1000.jpg

 

All sorts of cable operated heater valves are available. Most older vehicles used one. A small sampling from Summit:
https://www.summitracing.com/search...MIrZqeoMay7wIV8gFMCh0TLwEWEAAYASAAEgL5nPD_BwE

 

There is ball valves that can be installed in the engine to shut off the coolant flow for the summer or if a leak occurs.