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PostPosted: Mon Mar 07, 2016 12:22 pm 
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Joined: Thu Nov 29, 2012 4:32 pm
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Location: East Central Florida
It came to mind when I was realigning the topics earlier tonight that I had neglected to create a forum for heating, AC, and vehicle cooling topics, so here it is! I'll kick this one off with a first post.

When starting my car, there's sometimes a very long time delay between the time the car starts after I turn the key and the AC turning on. I've experienced delays before of between 2-4 minutes (on the long end, many times shorter) before the AC compressor will start and the vehicle will begin to cool. Granted it's March, but here in Florida (as with many of the southern states) it gets bloody hot and humid, and the time your car is running and pumping hot, humid ambient air in your face before the AC kicks in seems like a lifetime. Is this a common bug and has anyone else seen this?

Thanks
Eric

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System Manager and your tourguide for the day. Caprice Alumni, former owner of a 2011 Caprice 9C3 with a Rotofab CAI and front radiator cover, 3.45 LSD Camaro rear diff, Chris Henry performance tune, G8 GT 18" Enkei rims w/Holden lions, custom SLP axle-back muffler set with tips, Holden WM Caprice factory spoiler, Holden SSV leather steering wheel and leather shift knob, Whelen Alpha-12Q airhorn amp. G8 GT rear seat swap, AVS Ventshades.


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PostPosted: Mon Mar 07, 2016 5:38 pm 
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Location: Pittsburgh, PA
No, I haven't seen this myself. But it could be low freon pressure in the system. Have it checked with a manifold set or check it yourself. Using a real A/C manifold set is the only way to determine this, not one of the cheapo low-side gauges from part stores. Harbor Freight sells an inexpensive manifold kit. I have two if them. LOL.

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Tom (AKA: Storm)
2011 Caprice 9C3: L77, 7K miles, first-owner, purchased July 2011.
1995 Caprice 9C1: LT1, 176K miles, summer car.
1995 Impala SS: LT1, 20K miles.
1995 Caprice Wagon: LT1, 61K miles.
1995 Caprice Wagon: LT1, 128K miles. Rust In Pieces
1994 Caprice 9C1: LT1, 101K miles, winter car.
1969 Chevy C30: 383ci stroker, 4L80E, rollback car hauler.
1972 Chrysler Newport: 400ci big block, 27K miles, 2-door hardtop.
1969 Dodge Charger: 383ci big block.


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PostPosted: Tue Mar 08, 2016 7:08 am 
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Joined: Wed Dec 31, 2014 2:58 am
Posts: 414
Location: Texas Hill Country
I have seen the opposite problem on both my new 14 caprice and my work 14 caprice. The compressor will sometimes run for several minutes even after you have turned the AC button off. I figured there is probably some rhyme or reason to this programming. I am going to assume the AC is probably controlled by a combination of the PCM and BCM.

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Garner Ames



1975 Pontiac Grand Am L77 - 14.82 @ 92.89
1991 Chevrolet C1500 L31 Vortec/5 Speed
2006 Pontiac GTO LS2 - 13.89 @ 102.85
2014 Chevrolet Caprice 9C1 L77 - 13.60 @ 105.87
SS Roto-Fab CAI, Solo axle backs

2006 Chevrolet Impala 9C1 3.9L (owned by the tax payer in all of us)


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PostPosted: Tue Mar 08, 2016 4:06 pm 
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Joined: Sat Feb 07, 2015 8:31 pm
Posts: 1615
Location: Pearland, Texas
Could it be that the temp sensor in the car is sensing a cooler temp that what is set on the controller? Or, there's a delay in the controller getting a signal from the sensor? That would be what I would think is happening, but it's pure speculation.

The issue I have with our 2012 is EVERY time I turn the system on, the compressor is on. That's even after I turn it off in the previous drive. And it's no matter what the outside temp is. When I press the power button, I then have to press the 'snowflake' button if I don't want the A/C on.

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Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
And some others
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PostPosted: Mon Sep 05, 2016 5:43 pm 
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Joined: Fri Jul 10, 2015 6:05 am
Posts: 97
Location: Des Moines, Iowa
Mine does this almost every time, and I just had it topped off to the proper pressure by a shop. Strange issue.


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PostPosted: Mon Sep 05, 2016 7:09 pm 
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Joined: Sat Feb 14, 2015 2:12 am
Posts: 651
Location: SE PA
I have no delay on my 2011 just takes a minute to get up to full blast speed and yes its default to turning on the AC every time. My problem is a musty smell that is inside the HVAC case all summer long pretty much, It was less so this summer because i learned the trick of heating it up occasionally and spraying some lysol in as its on recirc mode but apparently its a known G8 issue and has some odd GM fix using a timer switch the runs the fan only when you turn car off.

This is the fix but I'm not sure I'm going to do that to my car.

http://www.g8board.com/forums/4-tech-lo ... smell.html


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PostPosted: Thu Sep 08, 2016 4:50 pm 
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Joined: Wed Dec 31, 2014 2:58 am
Posts: 414
Location: Texas Hill Country
Have you tried replacing the cabin filter to see if that helps with the smell?

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Garner Ames



1975 Pontiac Grand Am L77 - 14.82 @ 92.89
1991 Chevrolet C1500 L31 Vortec/5 Speed
2006 Pontiac GTO LS2 - 13.89 @ 102.85
2014 Chevrolet Caprice 9C1 L77 - 13.60 @ 105.87
SS Roto-Fab CAI, Solo axle backs

2006 Chevrolet Impala 9C1 3.9L (owned by the tax payer in all of us)


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PostPosted: Fri Sep 09, 2016 12:08 am 
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Joined: Sat Feb 14, 2015 2:12 am
Posts: 651
Location: SE PA
9C1fanatic wrote:
Have you tried replacing the cabin filter to see if that helps with the smell?


yes I have, its about a year old now, and that has nothing to do with the issue, apparently this is a GM design flaw across numerous platforms such that they came out with the electronic timing device that just runs the HVAC blower fan for a few seconds in an attempt to dry out the inside of the AC box where the mold spore tend to grow in certain climates. I guess I win with our crappy super humid NE summers... I just forgot to do the trick of running the blower with AC off on way home last night and this morning got a nice blast of foot smell as i went to work, temps all week in the high 80's with humidity.


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