08-23-2018, 07:25 PM
It might be the vacuum generator. It uses air passing over a Venturi to generate vacuum for your hvac control. Tom replaced his with an electric vacuum pump
1993 Newell (316) 45' 8V92,towing an Imperial open trailer or RnR custom built enclosed trailer. FMCA#232958 '67 Airstream Overlander 27' '67GTO,'76TransAm,'52Chevy panel, 2000 Corvette "Lingenfelter"modified, '23 Grand Cherokee.