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peabobble · 11-19-2017, 01:14 AM

There is a vacuum actuator inside the box. I looked all over for the replacement for my 77 with no success. The spot weld had broken and it was allowing heater air to flow into the cab. I resorted to JB Weld which worked great. The heater box has to come out to get to it.

11-19-2017, 01:14 AM	#5
peabobble Registered User Join Date: Jul 2013 Location: Drop Posts: 25	Re: A/C Vents There is a vacuum actuator inside the box. I looked all over for the replacement for my 77 with no success. The spot weld had broken and it was allowing heater air to flow into the cab. I resorted to JB Weld which worked great. The heater box has to come out to get to it.