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73-87 Chevy _ GMC Trucks => Interior & Equipment => Heating, Ventilation & Air Conditioning (HVAC) => Topic started by: gcochran223 on March 27, 2014, 08:30:14 pm
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been posting lately about the heating controls in my truck, hopefully trying to get it figured out soon. the truck is a 1986 k10 with air conditioning. i need to re feed the a/c controls with a vacuum source. when the previous owned the truck they gutted everthing in the engine bay with the hopes of being a mud truck. well i snagged the truck up and want to be able to switch from vent to defrost or however it works. i am by know means a mechanic just trying to get it working so any info is appreciated. do these a/c controls get their vacuum from the vacuum advance on the distributor? i checked the diagrams and that's what it seems. well my buddy that put the motor in for me has a vacuum line going from the distributor to the aftermarket carb. can i tee off that line(the main feed) to the vacuum reservoir and then into the cab? thank you.
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on the temperature control assembly that is vacuum fed, is it obvious which one is the input for vacuum feed? i have my vacuum routed i just need to connect it too the selector panel. i briefly looked at it and there was a few open ones on the rear but wondered if anyone off hand knew which would be the input or if it even says on the rear.
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on the temperature control assembly that is vacuum fed, is it obvious which one is the input for vacuum feed? i have my vacuum routed i just need to connect it too the selector panel. i briefly looked at it and there was a few open ones on the rear but wondered if anyone off hand knew which would be the input or if it even says on the rear.
Look at page 1B-41 (Pg 104), figure 42 of the 1986 Service Manual (http://www.73-87chevytrucks.com/techinfo/7387CKMans//Service/X8632_1986_GMC_Light_Duty_Truck_CK_G_P_10_to_30_Service_Manual.pdf) for vacuum reservoir plumbing; and pages 1B-20 (Pg 83), figure 20 and 1B-42 (Pg 105), figure 44 for drawings of the vacuum selector switch. Often, the vacuum switch ports are individually numbered if you look closely. Some of the ports may need to be capped.
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thank you