Time delay on AC cut-in after start

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elc32955
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Time delay on AC cut-in after start

Post by elc32955 » Mon Mar 07, 2016 12:22 pm

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
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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storm9c1
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Re: Time delay on AC cut-in after start

Post by storm9c1 » Mon Mar 07, 2016 5:38 pm

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.
Tom (AKA: Storm)
2011 Caprice 9C3: L77, 7K miles, first-owner, purchased July 2011.
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Re: Time delay on AC cut-in after start

Post by 9C1fanatic » Tue Mar 08, 2016 7:08 am

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.
Garner Ames



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

2015 Chevrolet Caprice 9C1 6.0L (owned by the tax payer in all of us)

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CrashTestDummy
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Re: Time delay on AC cut-in after start

Post by CrashTestDummy » Tue Mar 08, 2016 4:06 pm

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.
Gene Beaird,
Pearland, Texas
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1992 B4C 1LE Camaro
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PPV4ME
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Re: Time delay on AC cut-in after start

Post by PPV4ME » Mon Sep 05, 2016 5:43 pm

Mine does this almost every time, and I just had it topped off to the proper pressure by a shop. Strange issue.

xcidmigs
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Re: Time delay on AC cut-in after start

Post by xcidmigs » Mon Sep 05, 2016 7:09 pm

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" onclick="window.open(this.href);return false;

9C1fanatic
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Re: Time delay on AC cut-in after start

Post by 9C1fanatic » Thu Sep 08, 2016 4:50 pm

Have you tried replacing the cabin filter to see if that helps with the smell?
Garner Ames



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

2015 Chevrolet Caprice 9C1 6.0L (owned by the tax payer in all of us)

Solo axle backs

xcidmigs
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Re: Time delay on AC cut-in after start

Post by xcidmigs » Fri Sep 09, 2016 12:08 am

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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