Cable operated Heater control Valve

basic 302, cable operated control valve, not vacuum.....Does it matter what heater hose I put the control valve into? I was assuming in the heater hose coming from the water pump, atleast if the heater core starts leaking you could shut the flow to it?

kgdb

 

Shouldn't matter.What you are doing is stopping the flow.I just recently replaced one on a F100 with a 302 and put it on the hose from the pump.

 

Thats not gonna work....
The coolant is pressurized as well as flowing in a certain direction.
If you stop the directional flow, the pressure would still force coolant out thru the hole in the heater core by backflowing thru the other line.
You'd need a sealing valve in both lines.

 

Hey KGDB, I learned this one the hard way back in the 60,s. I blew out two heater cores in my 57 Chevy. I had the hoses reversed at the valve. The water pump heater hose connection is on the suction side pumping cooled coolant back into the engine. The upper heater hose connection at the Intake or thermostat area is the hottest coolant and under higher pressure. The heater hose connection at the intake should also have a smaller hole to slow the coolant so it has time in the core to transfer heat.

 

I isolated the heater core by putting a cable operated shut-off valve on both hoses.
They're hidden up under the dash and I put a knob on each one to control them by hand. Simple.

 

I disagree. In my TBird (and in alot of others) we have only one water control valve (manual replacement) and it works fine. They have run it this way for years with no problems.

 

The heater core was leaking on my 56 Chevy. I disconnected both hoses at the core connections, put about a one inch slug in each hose and secured with a hose clamp to close off the water flow. Pushed the hoses back on the core connections and everything looked normal until I got around to replacing the core.

 

I was talking about what I bolded in his post...not that you couldn't turn the heat off with one valve.
To control or stop the heat one is definately all you need.

KGDB mentioned that he thought one valve could stop the core from leaking if it got holed somehow and thats what won't work.

 

Understood now, when I think of it as mentioned two would be needed to isolate the heater core. One is just fine for for interrupting the flow. Thanks.


kgdb

 

Where can you by them---can't seem to be able to find them---part # ??

 

Heater control valaves are available at most any auto parts store. Usually shown in an illustrated parts book of A/C and heater control system parts.

 

63-66 Ford pickup are a good source for an inline cable controlled valve.

 

Thanks,that might help---all the parts stores in my area they jump in front of a computer and say what year,make,and model sir---if you don't have that info they are lost in space