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Keith_J, Which hose should I use valve on? And I read what I wrote from a past thread on here just go to search threads there are 5 on control valve, anyway here we are and thanks. There is nothing wrong in my box just a little rush of air as you move down the road at 45 or so, stop; then no...

It stops flow. How does heater circuit by -pass thermostat?

I'll need to disassemble if heat is needed if I go that way, right?

Also, ones I've looked at are vacuum, ( all by-pass mdls.) but the only one i saw that was metal (by-pass mdl. as well) is discontinued from a 50's model chevy. I guess it will be two valves and a check-valve, plus a tee, if no one pipes in? Is it true? that the flow can't be stopped on both...

OK, I've read most but maybe couldn't find all I needed, that given I got to stop heat from coming into cab, via flow we know about already. Is there a valve that allows by-pass as well so thermostat works as should? I'll do manual or electric if this is something thats been done? searched...