37 plymouth heater

[sherwood3333]

can anyone tell how install a heater with out tapping into top of engine ? 

[keithb7]

A coolant type heater needs to tap into the cooling system. Coolant is sent to what looks like a mini radiator inside the cab. A fan pushes air across this mini radiator, the air gets hot as it exits. The rear of the cylinder head has a port, an easy, ideal convenient place to tap into the cooling system. If for some reason you cannot use this port, you'll need to get creative. You need to create a loop for the coolant to from from the engine, to the cab heater, then back to the engine. Possibly tapping into an existing coolant line on the engine somewhere. I am not aware of an easy spot to do this. Personally, I'd figure out how to repair and utilize the port at the rear of the cylinder head if at possible.

[Reg Evans]

Here's the head on my '35 Dodge.  Note, the heater port was never tapped. I have owned many many MoPars and this was the only one without the heater port tapped out.