Re: All about heaters.
There is no ranco valve (water valve) on the '64-'66 heaters from the factory.
The Thriftair and Deluxe heaters will appear the same in the engine compartment. The Thriftair will have a smaller heater core than the Deluxe heater. The Thriftair heater has a single push/pull/turn knob inside the cab. The Deluxe heater will have 3 levers with knobs inside the cab. As for levers and flaps, the Deluxe heater will have a air flow flap inside the box in the engine compartment. It will be up close to the firewall with the lever arm on the right side towards the inner fender. This lever can be seen in the above pic at the top right. This is where the cable from the 'heat' control on the dash connects.
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