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73-87 Chevy _ GMC Trucks => Interior & Equipment => Heating, Ventilation & Air Conditioning (HVAC) => Topic started by: Stewart G Griffin on July 25, 2021, 12:22:44 pm

Title: Where does the vacuum for the HVAC vents originate?
Post by: Stewart G Griffin on July 25, 2021, 12:22:44 pm

Just curious where does the vacuum for the HVAC system originate?

Title: Re: Where does the vacuum for the HVAC vents originate?
Post by: VileZambonie on July 25, 2021, 05:26:40 pm

From the engine or from the vacuum pump on Diesel applications