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Mystery Hole! 1800 1973

So, I have learned from past experiences that when I find two disconnected things that look like they should be connected, always double check the manual. In this case, I can't find this listed in the service manual. What is the hose connection that's just behind the oil filter? Should I plug in this loose hose that's coming out of my firewall between the heater and the battery box?

Mystery fitting:


Mystery hose:






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New Mystery Hole! [1800][1973]
posted by  fran krause  on Fri Jan 25 15:32 CST 2019 >


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