Packard Forum Index » Pre-War (1899-1942)

My heater core on my 37 "120" is "shot" and beyond repair. I'm not going to replace the heater core and several people mentioned to just connect the fitting at the water pump to the heater shut off valve between #7 and #8 cylinder. I would think this would improve flow at the back of the engine? Wanted to get other opinions on this or should I just install a couple pipe plugs and seal it up?

Attach file:

---

  4ce29cd1-0e8f-4219-a2a6-f13a3ab363ad.jpg (6,311.66 KB)

If you connect the ports together in a closed loop then I would suggest you use the shut off valve to restrict the flow quite a bit or use some other restriction. If wide open with a large flow thru the short loop a considerable amount of coolant will never completely circulate thru the engine and will bypass the radiator which could lead to overheating.

Ok, I was thinking about that also, I have the heater shut off valve wide open as seen in the picture, I think 2-3 turns open would be fine? I'm thinking this is a good idea to get more coolant to the rear 2 cylinders as I've been told they don't get enough flow back there? I did install a new water distribution tube, maybe I'm just over thinking again!

I would just close it. As it's not going through the radiator anyway, I doubt it would do anything to the rear block cooling and the coolant being bypassed would be of better use in actual cooling system.