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Old 16 Feb 2014, 10:42 am
Flatlander
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Default AC Engaging

The air conditioning compressor on the wife's 2009 Civic LX coupe is
engaging once in a while when no cooling mode or defrost mode is
selected. I first noticed this as what I thought was en engine
stumble at highway speeds during a 6 hour interstate drive we were
regularly making. After starting to pay better attention, I noticed
it was happening at irregular intervals all the time. Maybe 2-3 times
an hour that I could notice on highway drives. After a while, I
started to get the feeling it was the AC compressor.

Finally, while idling near a curb with an outside temperature of 3F, I
heard the famliiar click and condensor fan spinning up for about half
a second. All this has been taking place in the regular heater mode
with the floor vents selected.

Is there some function in the Civic that cycles the compressor once in
a while just to keep it lubed up or something? Or do I need to start
looking for wiring issues.
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Old 16 Feb 2014, 03:10 pm
Geoff Welsh
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Default Re: AC Engaging

Flatlander wrote:
> The air conditioning compressor on the wife's 2009 Civic LX coupe is
> engaging once in a while when no cooling mode or defrost mode is
> selected. I first noticed this as what I thought was en engine
> stumble at highway speeds during a 6 hour interstate drive we were
> regularly making. After starting to pay better attention, I noticed
> it was happening at irregular intervals all the time. Maybe 2-3 times
> an hour that I could notice on highway drives. After a while, I
> started to get the feeling it was the AC compressor.
>
> Finally, while idling near a curb with an outside temperature of 3F, I
> heard the famliiar click and condensor fan spinning up for about half
> a second. All this has been taking place in the regular heater mode
> with the floor vents selected.
>
> Is there some function in the Civic that cycles the compressor once in
> a while just to keep it lubed up or something? Or do I need to start
> looking for wiring issues.
>


according to the wiring diagram for a non-CNG, non-Hybrid, 2009 Civic:

the PCM turns on the compressor clutch relay, and the relay turns on the
compressor clutch.

I don't see anything in operation theory about the PCM turning on the
compressor unless you request it via the control panel selections.

GW
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Old 16 Feb 2014, 09:54 pm
Flatlander
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Default Re: AC Engaging

On Sun, 16 Feb 2014 11:10:08 -1000, Geoff Welsh <GeeDubya@some.rr.com>
wrote:

>Flatlander wrote:
>> The air conditioning compressor on the wife's 2009 Civic LX coupe is
>> engaging once in a while when no cooling mode or defrost mode is
>> selected. I first noticed this as what I thought was en engine
>> stumble at highway speeds during a 6 hour interstate drive we were
>> regularly making. After starting to pay better attention, I noticed
>> it was happening at irregular intervals all the time. Maybe 2-3 times
>> an hour that I could notice on highway drives. After a while, I
>> started to get the feeling it was the AC compressor.
>>
>> Finally, while idling near a curb with an outside temperature of 3F, I
>> heard the famliiar click and condensor fan spinning up for about half
>> a second. All this has been taking place in the regular heater mode
>> with the floor vents selected.
>>
>> Is there some function in the Civic that cycles the compressor once in
>> a while just to keep it lubed up or something? Or do I need to start
>> looking for wiring issues.
>>

>
>according to the wiring diagram for a non-CNG, non-Hybrid, 2009 Civic:
>
>the PCM turns on the compressor clutch relay, and the relay turns on the
>compressor clutch.
>
>I don't see anything in operation theory about the PCM turning on the
>compressor unless you request it via the control panel selections.
>
>GW


Thanks for checking that out. I suppose it could be a self test
running every once in a while to make sure the clutch is still there,
etc. Seems like something that would only run at power up, though.
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