Question about 1991 Chevrolet Lumina
Heater on works on defrost, AC not working and vents recently stopped working ..vacuum lines throughout the system are slowly failing and need to be replaced. Not afraid of the work, just need a decent map to guide us
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Posted on Jan 02, 2017
SOURCE: I replaced the ac compressor
The ball is a vacuum tank. It would take the active vacuum line on one side and the other would go to the vacuum line that leads to your ventilation controls. Connect a length of vacuum hose to either side and BLOW through it. If you can't blow through it, that's the side that goes to the engine since it would have a check valve to prevent the vacuum from escaping when the engine is off. If you can blow through both sides, then it doesn't matter which hose goes to which side.
Posted on Jun 21, 2011
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