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Thanks for the reply. That's what I plan on doing next. I tightened them by hand because it didn't want to strip any threads so maybe they just aren't closed all the way but they sure do look like they are. Is there any visible thread left when you close yours?

I have an M939 and the heater core is leaking pretty badly. As a temporary fix I want to bypass the heater core. Are the petcocks on the block where the hoses connect to close it off? They appeared to be loosened (open) all the way so I tightened them all the way however the heater core still...