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Bypass Hose

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Is it okay to use 3/4" heater hose for the bypass between the water-pump and the thermostat housing on the straight 8 Buick? I just installed, and after a 30 minute drive it looked like the hose was swollen in the middle. Could be my imagination, but don't think so. Thanks.

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I have the exact same car as you do. Same model, same year. More comfortable than my living-room sofa.

  • Haha 1

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Ben, you said this is what I use. What exactly did you mean? Yes, it would be nice to meet up, we're only 932 miles apart. Road trip!

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I use heater hose.  On the bypass.  Bt the way, is the bypass OPEN to the pump suction?  When I did my engine, I had the pump rebuilt . Installed it. came fall and needed the heater, no heat. After much fooling around, I discovered the passage to the suction was plugged. Cleaned it out and the heater worked.  Of course, the engineering reason for the bypass is to have a small amount of water circulating through the engine while the thermostat is closed.

 

  Ben

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Swollen hose indicates pressure as if the outlet was blocked somehow. You may need to drill a small hole in the thermostat or it could be blocked by debris.

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