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Climate Control Problems (Air Conditioning, Heat) - All Cars

791 messages,  Last post on Aug 12, 2009 at 12:55 PM

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What is this discussion about? Heating / Cooling

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#783 of 791 AC/Heating by brandiwine06 Aug 02, 2009 (12:51 pm)
Chevy Venture 2000 The van has 3 center of dash vents... Left and center now give warmish air... The furthest to the right gives cold air??? What could be causing the problem... Is there a blend door ? Part of AC not cooling?  We have been all over looking for some answers but with no luck at all. Even dealer ships!! If anyone has any info on this please share!!! I have to get this fix & get back on the road for work & living in Florida A/C is a must have Replies to this message: imidazol97 (Aug 09, 2009 4:14 pm)
#784 of 791 bronco a/c by buck96 Aug 09, 2009 (1:28 pm)
the ac dash vent diverts to the defrost and floor vents under pulling conditions, I'm figuring I have a vacuum leak, can you tell me if this is so and where I would need to look to correct the problem? Replies to this message: imidazol97 (Aug 09, 2009 4:16 pm)
#785 of 791 AC/Heating by brandiwine06 Aug 09, 2009 (4:12 pm)
Chevy Venture 2000 The van has 3 center of dash vents... Left and center now give warmish air... The furthest to the right gives cold air??? What could be causing the problem... Is there a blend door ? Part of AC not cooling?  We have been all over looking for some answers but with no luck at all. Even dealer ships!! If anyone has any info on this please share!!! I have to get this fix & get back on the road for work & living in Florida A/C is a must have Replies to this message: oldfarmer50 (Aug 12, 2009 12:55 pm)
#786 of 791 Re: AC/Heating [brandiwine06] by imidazol97 Aug 09, 2009 (4:14 pm)
Replying to: brandiwine06 (Aug 02, 2009 12:51 pm) I can tell you that many people have had problems with the newer H-body (leSAbre, Bonneville) some with dual control AC giving warmer air to the driver and cold air to the passenger. They fixed it when they had the system recharged. Apparently there, the freon enters the evaporator in a location over which air passes that goes to the part of the AC box that feeds to the passenger side. The freon is warmed up somewhat when the coolant gets to the other part of the evaporator and that air doesn't get as cold.   I would think that the dealerships had checked the charge. Maybe it's within tolerance and they didn't find a need to recharge, but the system has actually lost a little freon with the 8-9 years of age on the system.
#787 of 791 Re: bronco a/c [buck96] by imidazol97 Aug 09, 2009 (4:16 pm)
Replying to: buck96 (Aug 09, 2009 1:28 pm) You should check all the rubber lines and the tank which serves as a reservoir for vacuum and check the one-way valve that is in the system somewhere so that the intake manifold vacuum can suck air out of the system controlling the heater unit, but when vacuum in the motor drops under high load or flooring it, the higher pressure air can't flow into the heater system.
#788 of 791 AC/Heating by brandiwine06 Aug 09, 2009 (4:19 pm)
Replying to: bhoskins (Oct 13, 2003 3:43 pm) I am having a problem with my A/C, I have read you post & I am hoping you might have an idea of whats going on,, I have a Chevy Venture 2000 The van has 3 center of dash vents... Left and center now give warmish air... The furthest to the right gives cold air??? What could be causing the problem... Is there a blend door ? Part of AC not cooling?  We have been all over looking for some answers but with no luck at all. Even dealer ships!! If you have any info on this please share!!! I have to get this fix & get back on the road for work, kids, etc.... living in Florida A/C is a must have! Thank You for your time! Replies to this message: kiawah (Aug 09, 2009 9:17 pm) imidazol97 (Aug 10, 2009 4:43 am)
#789 of 791 Re: AC/Heating [brandiwine06] by kiawah Aug 09, 2009 (9:17 pm)
Replying to: brandiwine06 (Aug 09, 2009 4:19 pm) Have an airconditioner shop check your freon level.
#790 of 791 Re: AC/Heating [brandiwine06] by imidazol97 Aug 10, 2009 (4:43 am)
Replying to: brandiwine06 (Aug 09, 2009 4:19 pm) I posted yesterday but something happened and the post is not here!   On some H-bodies (2000+ Bonneville, LeSabre) people have noted that the passenger side will be cooling fine and the driver side gets warmer air. The owners have looked for phsical causes in the HVAC unit but others found that a low charge results in the freon's cooling ability being used on the side of the evaporator where it enters and the air from that side goes to the passenger side of the car, while the freon isn't as cold as it expands on the rest of the evaporator where air goes to the driver. It still cools but it doesn't feel nearly as cold as the passenger air, probably partly due to less humidity removal along with a slightly higher temp.   Your HVAC unit may not be the same but that should have been the first thing a dealer checked and made sure the freon was fully charged.   Good luck finding the cause and the fix.
#791 of 791 Re: AC/Heating [brandiwine06] by oldfarmer50 Aug 12, 2009 (12:55 pm)
Replying to: brandiwine06 (Aug 09, 2009 4:12 pm) "...Left and center now give warmish air...Is there a blend door..."   I seem to remember that on GM vans the blend doors are controlled by vacume. Depending on engine load the vacume in those doors can fall and redirect air flow. Thus if you are going up a steep hill you might have the air switch from face level to foot level without changing the settings.   Check your lines for leaks.

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