VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1933-1936 35 Master Heater Hose Routing

The Feb 14, 1935 Chevrolet Service Bulletin (SR Bulletin #20) has an illustrated attachment showing the hot water tap for the heater at the top left rear of the head, where the heat indicator bulb is inserted.

The Chevrolet 1935 Engineering Features booklet for Master Passenger Car carries this statement (following a description of the tapped hole on the side of the water pump for the heater return line): "A similar tapped hole is provided in the side and near the front of the cylinder head. The water leading from this connection is approximately ten degrees hotter than that drawn from the rear of the head as in previouos designs." This booklet has no publication date.

Which document supercedes the other?

My question is: which is the "most correct" location from which to take hot water for the heater?

Based on the above statement, and the fact that later model cars didn't have the heater hose coming off the rear of the cylinder head, I would say that the above statement is the most current.

:) :grin:

None of the 1935's had the heater hose coming off the back of the head as a 1934 and prior did. One hose connects to the opening in the water pump and one connects to the opening in the front of the head, to the right side. Cars came from factory with pipe plugs in the openings. This is also the info. that I can find for 1935 in both the Enginering Manual and the Service News. What did I miss?

Gene - I will email you a copy of the cited Service New with the illustration of the hose routing. ( I thought I got this item from you!!)

The 35 Engineering features books were issued before the start of production sometime in Nov. 1934. The February 14, 1935 Service Bulletin #20 issued in Zone 12 Buffalo, NY shows the suggestions for installing Chevrolet Hot Water Heaters on 1935 Master Models and show installing a fitting at the heater indicator fitting at the back of the head. Jim G.; I am the one who sent you the Service Bulletin. The Service Bulletins are separate from the Monthly Service News issues. I have close to a full set for 1934 and 1935 from the Buffalo, NY Zone office to all there Dealers.

Each Zone office also issued other publications during each month such as the Chevrolet Parts and Accessories Merchandising Bulletins, Special Service Bulletins (Relate more to safety items), Parts Smart issues (More information for the Salesman), Special Tools , Fisher Body Service News but by far most were the Chevrolet Service Bullentins (over 71 issues in 1935).

The 1935 Master Engineering Features mentions the water pump and front of the cylinder head hose locations. This book is so early all it shows is the Master with the first type of front door inside handles. The 1935 Standard book shows the same.
The Jan. 1935 Service News shows the new features for the 1935 Standard. Mentions the water pump and head locations for the heater hoses.
The Feb. 1935 shows the features of the Master but does not mention the water pump or any of the other engine features as the Master and Standards used the same engines.
The instructions from 35 pick up man clearly show the hose hook to the rear of the head.????
If it were mine I would use the front connections as it eleminates looping the hose over the valve cover.
I had both hoses on my 1934 commected to the front with adaptors that were sold at one time. This "sin" was never noticed in judging. :/

Just one more thing that will never be fully understood. I have seen hose routed both ways.

The funny thing is that the Engineering Features booklet was surely published late in 1934 to promote the Master witht the new features. Compare that to the date on the Service Bulletin of Feb 1935.

I will route my heater hoses both to the front. Now I need a fitting for the head with an included valve and the outlet coming off at an angle. The one that came with the original engine was junk just like the rest of the engine.

The one with the right angle was the special fitting for in the back corner of the head. It fit into the temp. sending opening and the temp. sender fit onto the top of it and the heater hose fit into the side. I would assume that you need two common heater hose nipples, one for the front of the head and one for the water pump housing. The nice thing is it can always be changed to the other style at a later date with very little work.

Jim G. I have the correct fitting for the back of the cylinder head if you want to go that route. e-mail me or phone. I find a lot of Chevrolet published stuff very confusing at times sometimes I don't think everybody were on the same page. Many of the 1935 publications show many 1934 components that were not used in production; even in their "Golden Book of Trucks" shows a 35 1.5 ton chassis with a 34 fuel tank. The Chevrolet Service Bulletins are a better source for actuate up to date information then using the very early Engineering Features or Sales literature. I think you can plumb your heater hoses with either location without judging penalties because we have the documentation that says they did it both ways.

Chev Nut
When using the front engine tap, wasn't there a valve to shut off the water somewhere in the heater lines? My original engine had a shutoff at the front. It may have been the same fitting that was used at the rear, but it did not look like the drawing in the Service Bulletin.

Pump Jockey
I will contact you soon. I would like to visit you anyway to see your vehicles and shop. And thanks for the accesory and heater info you provided some time ago.

Originally there was no shut off valve. That accessory came along in 1937. Prior to that the hoses would be disconected and U looped for the summer.