AIR RECIRCULATION SWITH

critter · April 9, 2005

Is it normal operation for the AC compressor to come on when recirculation button activated in "vent" mode?

GM-Tech · April 9, 2005

Is it normal operation for the AC compressor to come on when recirculation button activated in "vent" mode?

Yes.

snoman · April 9, 2005

Is it normal operation for the AC compressor to come on when recirculation button activated in "vent" mode?

Yes.

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Since when? Vent is the economy setting for A/C it should only work when A/C or deforost is selected. None of my vehical have ever cycled the compressior in "vent" mode or with A/C switch not depressed unless deforst is selected.

critter · April 9, 2005

It was a new one on me, but if I am running the vent & decide to recirculate (necessary when driving by feedlot) the air conditioner compressor comes on with the associated cool air.

snoman · April 9, 2005

It was a new one on me, but if I am running the vent & decide to recirculate (necessary when driving by feedlot) the air conditioner compressor comes on with the associated cool air.

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Might have something to do with recirculate to prevent humidity build up but mine do not do it and my newst one is a 2000 classic, not a Silverado.

USA1Fan · April 11, 2005

It was a new one on me, but if I am running the vent & decide to recirculate (necessary when driving by feedlot) the air conditioner compressor comes on with the associated cool air.

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Might have something to do with recirculate to prevent humidity build up but mine do not do it and my newst one is a 2000 classic, not a Silverado.

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My '04 with the automatic dual zone climate control does it. So did my 2003 Trailblazer (manual dual zone climate control, the standard setup in '03-'05 trucks now, I think) and our 2004 Malibu LT with automatic single zone climate control system.

I believe you're right about the reason behind it too- it's supposed to prevent fogging of the windows in recirc mode.