Heater Hose and Block Heater

d282 · Oct 14, 2011

Good Morning-
I am wondering where to hook up my cab heater hoses on my 403 diesel combine as well as put in a tank heater. The parts book says for the cab heat one hose from the water pump and one hose back to the block. Before I replaced the hoses they put a T in the water pump line that goes to the oil cooler. Is this were I should hook up my one line, or try to put in another hose barb on the side of the water pump and go there? Should the return line go back to the back side of the head? I have two plugs there and thought I could plum my tank heater from one of them and to the block drain cock on the side. I will post pictures if needed, but the reason I am asking is that I would like it to be done as original as possible. Thanks

Bob · Oct 14, 2011

I used to have a 503/282 diesel, and we put a heater in the cab for COLD North Dakota sunflower harvest weather, but it's been a LONG time!

Seems to me we got the hot water out of the T-stat housing and returned it to the waterpump.

As far as a coolant heater, WHY not just install a block heater, rather than a tank heater... that's what we used.

Another comment... WHAT is now tee'd into the line to the plate-type oil cooler?

I'd try to avoid that, to keep coolant flow "as-designed" through the cooler for maximum engine oil cooling when used in HOT weather.

teddy52food · Oct 14, 2011

The one on the water pump would be the suction side. Off the head is the hot side.

d282 · Oct 14, 2011

Thanks to both. No, I did not want to use the T so I removed it when I put in new hoses, and the more I think about it I will put in a block heater in the frost plug.

So, hook up one heater hose to the port on the back of the head (heat) and hook the other to the left side of the water pump where the other hose is for the oil cooler for such/return.

armand tatro · Oct 15, 2011

I Install all my heaters with ball valves at the engine than plumb hoses from there. That is because if you have to replace compents or simply don't heat in the cab in the summer time you just close the valves. I also prefer a tank heater over block heaters because if heater fails instead of draining cooling system you just shut off valves and replace faulty componet. Seem likes heaters fail in the worst weather when tfey are needed the most! I changed the tank heater in my backhoe during a snowstorm in about ten min. and only lost a cup of coolant because I had shut-off valves in the right places. I have a Cat engine in the semi with a block heater in a hard to get to location. With 44 qt. cap. system draing under less than ideal conditions can be a real pain. Armand

Heater Hose and Block Heater

d282

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Bob

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teddy52food

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d282

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armand tatro

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