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Username Post: Is it ok to block off both heater hose fittings on the block?
Valued Contributor
Posts: 3162

Age: 47
Loc: West Michigan
Reg: 02-18-12
03-24-19 08:59 PM - Post#2762805    
    In response to busterrm

  • busterrm Said:
In the desert regions most cars have the heater bypassed with hose bought at any parts store. The two outlets are usually different size hose, so let the assistant at the parts store know if your vehicle is that way so the bypass hose fits correctly. You might consider a bypass for the heater core also.

I had a heater core blow out of town once, and I stopped by a NAPA and bought a fitting that had was 3/4" on one end and 5/8"th's on the other. I still have it tucked away in case I need it... Although, I can't tell you exactly where it is.

I think there are a few small blocks that don't have the internal bypass... 60/70's Corvettes, I think? I looked into it at one time, and it seem like it was a Corvette board where they were having issues not running a heater core. Also the late Vortec SBC has an external bypass (like a BBC) instead of the earlier internal to the pump bypass. You really neeb a bypass of some kind, and the heater circuit will function like that if there's nothing else.

99 K3500 RCLB

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