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Old January 6th, 2020, 11:07 PM
James James is offline
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Join Date: Jun 2013
Location: Greer, SC
Truck: 1964 GMC 1500 2wd
Age: 69
Posts: 432
Rep Power: 199
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Default Re: 1964 GMC Model 1002 build journal

Quote:
The heater is an airflow type but it is the single knob thrift heater so it has the smaller core. After looking at the parts, I see the core mounting plate has a stencil to guide you if you want to cut it out for the larger core (pic #3), which I'm inclined to do. I plan to add a manual shut off valve up on the engine so I can shut the hot water off in the summer.
Steve
I used an H valve (see attachment) to maintain the flow to and from the engine. I am not sure, but I believe the OEM left it flowing all the time to allow heated coolant to reach the thermostat in a timely manner. It is vacuum operated off (remove vacuum to turn it on) and I have not created a mean to control it in the cab yet.
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