Re: additional heating / valve/ 1937er Convertible Coupe

Posted by HH56 On 2023/3/27 9:07:43

You will need to find a run of hose straight and long enough to cut and insert that type valve. Ideally the shut off valve should be in the line between the supply port and heater. In the factory layout the short length between the head outlet and heater inlet would be about the only place. If you eliminate the hard tubing over the engine for the return side and just use hose then you could place the valve in the return line as a less desirable location. There would be more options but you will need to figure how to route and clamp the hose so it does not fall on the manifold or be subject to other damage. Don't believe clamping the return hose to the inner fender as later cars did is an easy option on 37s because of the lift up hood.

Here is the photo from service letter 2 linked above which shows the factory valve located in the white circe at the outlet port on the head. A similar type valve was used thru 47 although the shape of valve and angle of outlet port varied slightly. I cannot speak for the size valve your 37 needs but on later cars the thread for the port in the head is 3/8 NPT and outlet is for 5/8 hose. Yours may be the same but you would need to verify.

Similar working and looking universal type heater shut off valves to the originals are still available at many parts stores but if you need the 3/8 NPT thread, that requirement narrows the style and availability considerably.

Here is the factory photo and a view of a few of the valves Napa carries. Napa appears to have stopped listing the dimensions on their website so no idea if any of their valves have the 3/8 NPT thread. I bought a similar valve for my 47 from another parts store.

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  37 heater.jpg (129.58 KB)


  Heater valve.jpg (78.11 KB)