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For the first time since I owned my car, I had to run my new 07 LE's a/c for a long period of time this weekend. I could really notice when, what I guess is, the compressor cycling on and off. At idle, there is a barely audible click then an very small increase in idle speed and a noise from the engine that lasts 4 or 5 seconds, then the click again, the noise goes away and idle speed goes back down. At highway speeds I notice when the compressor cycles on also.

Now maybe I am being way too picky and this normal, but I never noticed it happening to such a degree with my other vehicles (01 Camry and 02 Corolla). Should I be concerned? Thank you for any feedback.
 

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I have a 2006 corolla and I live in Texas so I almost always have the a/c on most of the year. I don't think it is a problem and I noticed that it is the engine fan kicking on and off. I really only notice it if I am idling when it is warm out. But I don't think there is a problem with your a/c.
 

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I've driven an '06 Corolla extensively, and just recently had a brand new '08 Corolla as a loaner. The A/C compressor cycling on and off is exceptionally loud/noticeable for some reason. Like you I've never noticed it in any other cars I've driven. I don't even have to turn around to know that a Corolla has pulled up next to me if I'm standing in the driveway - the loud whir of the fan and noise from the compressor cycling gives it away.

That said, I wouldn't worry about it. I find it slightly annoying but nothing more.
 

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the 9th gen has had alot of problems with the ac the ac clutch goes out in most 03-04, and my wifes 04 the ac relay blew, the clutch is the noise you hear it is turning on and off, if your ac blows cold, then sometimes warm the clutch is bad. Mine is not not that loud.
 

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i just got my 07 corolla Le and i used the ac this passed week end and there was a noise but not much to really care about. Im going to get back and look at it again while i drive next thanks for bringing this to my attention

Thanks
 

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the 9th gen has had alot of problems with the ac the ac clutch goes out in most 03-04, and my wifes 04 the ac relay blew, the clutch is the noise you hear it is turning on and off, if your ac blows cold, then sometimes warm the clutch is bad. Mine is not not that loud.

My 03 was doing exactly that but only noticed it in extreme heat(temps 90-up) I thought it was low on refrigerant and added a can, It started to shut down/start up in any temp continuously, my brother had some gages and we found out it was overfilled, I drained some out to a little below the norm and for some reason I haven't ever had that problem since, that was over three years ago and works fine now, but using it really cuts my gas mileage!
 

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i am having problems with my corolla 03 S , today it stopped throwing cool air air and it stayed that way
that happend to me a while ago and it went back to normal all by itself
but this time it is different!
what do you call the "ac clutch" it is the ac relay?
and if its so where can i find it
thanks
 

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Based on your description the clicking sound is probably your ac compressor turning on and off, not to be confused with the electric cooling fan which will also cycle especially noticeable while you are stopped. Open your hood and watch to see which one is cycling so quickly. However if the ac compressor continually cycles every 5 seconds I think there may be a problem, maybe low freon or bad thermostat control. Call the stealership and ask how quickly your ac compressor should cycle, phone calls are cheap.
 

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I just paid $1,100 to have a new compressor installed in my '03 with 60K miles. Repair tech said needed a new relay but also said he would have to install a complete new compressor as well. That was in August. We've had an 80 degree Christmas Day in Dallas and turned on my AC today for the first time since early October and it's only blowing cool - not cold - air. Is it broken again?
 

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I keep hearing about a faulty relay in the '03-04 Corolla models. AC works, then just stops. is this relay something that can be replaced without putting in a new compressor? If so, I may have just gotten hosed by a repair tech that came highly recommended. In August one day AC blowing icy cold, the next day, nothing. Tech tested it said it was a relay but also said he'd have to replace the entire compressor. UGH. Charged me $650 for parts, $450 labor. Did I get taken? Sadly, it looks like it may be starting up again; however, not as bad. Blowing 'somewhat' cool air just not cold (it's unseasonably warm right now in Dallas, Texas). Especially for December!
 

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I just paid $1,100 to have a new compressor installed in my '03 with 60K miles. Repair tech said needed a new relay but also said he would have to install a complete new compressor as well. That was in August. We've had an 80 degree Christmas Day in Dallas and turned on my AC today for the first time since early October and it's only blowing cool - not cold - air. Is it broken again?

Sounds like a leak somewhere in the system. I would take it do a different dealer or mechanic. Relay can be replaced without needed a new compressor too, if that means anything to anyone.
 
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