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Re: Holes on Firewall?
I think you have the vac ball upside down. On my trucks there's only one port on the vac ball & its pointed up. The hose runs behind the wiper motor mounts, through the plastic sleeve above the booster, and finally splits into the main heater control line near the distributor.
Although I can't verify if that's factory or if it's been changed by a PO.
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