Re: [MV] Combustion heater

Cliff Dahl (
Fri, 05 Dec 1997 21:06:15 -0700

Bobby Joe:
The heater you mention is probably the South Wind model 978 made by Stewart
Warner Corp. I have one of these on one of my M211's. There were about 5
or 6 different revisions of the model 978, but the exhaust seems to be same
on all.
There should be an exhaust pipe that runs from the bottom of the heater
down toward the frame under the cab. It is a flex pipe approx 1 1/2" in
diameter. The 5 1/4" plate that you mention is the opening for the air
intake for the heater. There should be a grill over this hole and it
should match up to the air intake on the heater. I have just purchased the
manuals for these heaters if you have any more questions.
Hope this helps,
Cliff Dahl
M211 (2)

At 03:56 PM 12/5/97 -0500, you wrote:
>Greetings all,
> I have a question about the combustion heater on my GMC M211 Truck.
>Is there an exhaust pipe that goes to the outside of the truck? Mine empties
>under the hood and the exhaust fumes can get a little thick in the cab
>sometimes. There is a 5-1/4 DIA. plate over a hole in the hood, but is about
>12" in front the exhaust outlet. Is this hole were the exhaust is ment to
>empty. I don't know if this the correct heater for the truck, it was on it
>when I got the truck. The data plate on the heater says
>Heater Combustion 20,000 BTU/HR
>Model # 84200D24
>NSN 2540-00-933-8918
>ORD # M46782/1-1
>Stewart Warner Corp.
>Is this the correct heater?
>Is there an exhaust pipe? or an I going to need to make one?
>It heats fine, the hoses need to be replaced (I am working on that)
>thanks,Bobby Joe Pendleton II

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