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  #13  
Old 04-18-2012, 11:01 PM
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Re: AC Always on?

yeah, something is not right with the system.

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  #14  
Old 04-15-2014, 09:01 AM
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Re: AC Always on?

Did you guys ever figure out the solution to this? I believe I am experiencing the same thing.
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  #15  
Old 11-09-2016, 07:35 AM
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Re: AC Always on?

Did anyone ever figure this out? My car is doing the same thing.
It's a 2012 GC SRT8.
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  #16  
Old 11-09-2016, 09:47 AM
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Re: AC Always on?

With almost any 'auto HVAC' system, the A/C will continue to function all the way down to about 35 degrees Fahrenheit at with point the system is unable to 'compress' the freon (R134a).

There are some systems that run the compressor even though the temp drops below freezing (Subaru), I don't recall the reason.

The manufacturers have programmed this to prevent condensation on the interior windows due to temperature differences between the inside and outside.

In the 'old' days, it was a big deal to turn off the A/C because of the power drain to early 'smog' motors (when V8s put out about as much HP as modern small 4 cylinders). Since then engines have become much more powerful and A/C systems have become much more efficient such that it is no longer considered a parasitic drag on the motor.

Usually if you turn off the system then use a button OTHER THAN the 'auto' button to turn it on (say for venting with the windows open) you can press the A/C button to turn it on (lights up) and then again to turn it off (light off). In theory you should then only have ventilation with no A/C, but then again maybe not. All depends on how they programed the HVAC system.
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Old 11-09-2016, 05:14 PM
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Re: AC Always on?

Quote:
Originally Posted by Todd3.6 View Post
With almost any 'auto HVAC' system, the A/C will continue to function all the way down to about 35 degrees Fahrenheit at with point the system is unable to 'compress' the freon (R134a).

There are some systems that run the compressor even though the temp drops below freezing (Subaru), I don't recall the reason.

The manufacturers have programmed this to prevent condensation on the interior windows due to temperature differences between the inside and outside.

In the 'old' days, it was a big deal to turn off the A/C because of the power drain to early 'smog' motors (when V8s put out about as much HP as modern small 4 cylinders). Since then engines have become much more powerful and A/C systems have become much more efficient such that it is no longer considered a parasitic drag on the motor.

Usually if you turn off the system then use a button OTHER THAN the 'auto' button to turn it on (say for venting with the windows open) you can press the A/C button to turn it on (lights up) and then again to turn it off (light off). In theory you should then only have ventilation with no A/C, but then again maybe not. All depends on how they programed the HVAC system.
Appreciate the response Todd, I'll monitor it going forward however in the 2 yrs I've owned this car I've never had this happen.

Also my golf used to make this sort of noise before the compressor died, hopefully it's ok. Thanks again.
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  #18  
Old 12-03-2016, 12:23 AM
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Re: AC Always on?

I swore the other day I felt the compressor kick on and off at a stop light. I reckon when in "Auto" mode, the A/C is on. In my other car, the A/C light comes on when "Auto" is pressed. I'm sure it's the same here.

You could probably just hit the A/C button twice (to "officially" turn it on and then turn it off). That would leave auto fan and vent settings intact while ensuring A/C is off.
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  #19  
Old 12-03-2016, 01:54 AM
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Re: AC Always on?

Quote:
Originally Posted by HerrGruyere View Post
I swore the other day I felt the compressor kick on and off at a stop light. I reckon when in "Auto" mode, the A/C is on. In my other car, the A/C light comes on when "Auto" is pressed. I'm sure it's the same here.

You could probably just hit the A/C button twice (to "officially" turn it on and then turn it off). That would leave auto fan and vent settings intact while ensuring A/C is off.
Thanks, will give it a shot.
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