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Old 06-01-2013, 08:36 AM   #1
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A/C Compressor Clicking

So i was sitting in a car park having a smoke, so i had the window open, and i still had the heater set to windscreen, max heat and and 1. I noticed a clicking noise coming from under the hood, and the car power going up and down when it clicked. I had no idea what it was, until i got home and checked under the hood with the car running. I found something turning on and off with the serpentine belt going around it. I checked the Haynes manual and this appears to be the A/C Compressor.

The only things i can see that cause this clicking is Air Con being on, and also having the blowers aimed at the windscreen, which also causes the radiator fans to kick in also.

Is this normal ?

Could it be related to a problem i have been having, in which the aircon works for 30 minutes sometimes, and then cut outs, until i turn it off for a bit, then switch it back on about 30 minutes to an hour later ?

Il try and get a video of it if i can :)


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Old 06-01-2013, 08:44 AM   #2
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No those are two separate "problems"...

When you have defrost on, the A/C runs to remove moisture from the air so your windows are less likely to fog up.

As for you problem with the A/C kicking out, you probably have moisture in the A/C lines that freezes after the A/C has ran a while, this can become a problem. It's best to have the A/C system evacuated and recharged.
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Old 06-01-2013, 01:33 PM   #3
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^^ huh?

That's totally normal man, if it wasn't blowing cold air, then that would be something else. American cars have been doing this for a long time- just another way our government tries to ensure that everyone uses more fuel. Well... that and dry air tends to de-fog a windscreen much faster.

Your AC will kick off when the pressure is too low on the low side- that's normal. Especially if the temps are lower outside. It will still come on, but the low pressure switch will kick it off much quicker since pressure is relative to temperature- ambient and evaporator temps.

Don't worry about that, or the little bit of water that will collect under the car when the AC is on until either you start smelling swamp water inside the car, or the AC stops being cool.

Don't worry about moisture in your system. The only time you have that problem is when the system is exposed to the atmosphere- which means no cool air for you, and no refrigerant inside. There is a part of your AC system designed to remove moisture and trap it.
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Old 06-01-2013, 01:51 PM   #4
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^I could not agree more Alex.
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Old 06-02-2013, 04:03 AM   #5
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Yes, normal for it to click on and off all over the place. As long as you are cold don't worry about it.

If the compressor clicked on once and stayed on continuously, it would blow up in a matter of minutes. They always have to eventually cut back off at least occasionally.
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Old 06-02-2013, 10:08 PM   #6
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Quote:
Could it be related to a problem i have been having, in which the aircon works for 30 minutes sometimes, and then cut outs, until i turn it off for a bit, then switch it back on about 30 minutes to an hour later ?
I could be entirely wrong... But this is why I said moisture could be in the system, if the PO changed something himself and never evacuated the system there could be moister in the lines... AFAIK this will cause the A/C to "freeze" because the moister has clotted up somewhere and dulled the efficiency of the system.

Granted all aircon systems work poorly if not evacuated, but they still work...
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Old 06-02-2013, 10:36 PM   #7
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Never can tell, could be.........generally shows up a bit faster than that. But.......could be clutch coil getting hot and shucking out too.
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Old 06-16-2013, 08:47 AM   #8
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Here is a video of the issue, typical it doesn't show up with the windscreen heater on :p

http://www.youtube.com/watch?v=rvsDM...ature=youtu.be

Could be normal for all I know, im just looking into it really.
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Old 06-22-2013, 05:08 AM   #9
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Bump.

Anyone ? :(
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Old 06-22-2013, 07:56 AM   #10
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Yes all normal. Your revs will alternate to take into account the extra load/power drain that you have on the engine. If you turn on your lights you'll also see same effect on revs.....effectively revs will increase or decrease to supply extra power to the alternator to maintain specified charge on battery/electrical power. If it didn't do so then you'd see headlights dim due to lack of power.
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