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Yes. I have 2 personnel ones, new old stock. $500ea, 100% complete. 30,000BTU. The coolant ones are a bit more obscure. Most I have seen are non-functioning or in parts.

PM sent. I don't have the exchanger to heat engine coolant. There is also an engine oil heater portion, I think it is really just a deflector which flows the heater exhaust across the oil pan.

Control head, 30k vs 60k comparison, and 30k neatly installed in an M809/M35a2 cab using the stock defrost diverter box. Realistically, you adjust cab temp via how far the window is down. Several others here know much more about these than I. Cranetruck and gimpyrobb are 2 super experts in...

I have several, NOS, complete in wood crates with heater, control box, wiring, fuel pump/filter, and exhaust. Send $. On your own for brackets, I don't have the NSN for them anymore. Unbelievably nice feature. Get in the truck, start the heater, enjoy warm air, start the engine, and go...

*double post, delete*

Here is an example of one installed onto an M939 series. Takes place of the heater core box and fan, it is an arctic accessory. I have this same setup, not installed yet. The correct M939 brackets to fit this 30,000BTU fuel fired heater to the heater core mounts are rare to find used, I had a...