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Old 23rd February 2012, 15:18   #1 (permalink)
 
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air conditioning vibrates

Hello everyone,

I seached the forum for a while but I could not find any information.

My Honda Civic had a lot of vibrations when te AC is on and the car stands still. (when I am driving, it is not mentionable).
What happens when the AC is on, is that it vibrates constantly. And then say every half minute, the engine goes from approximately 700 rpm to 900 rpm for about 2 seconds and then back to 700 rpm. Then it repeats.
When I put the AC off the interior becomes calm and quiet.
I never had this in other small cars.

(is the kind of the same vibration when the motor starts to make power for opening the windows, setting the sidemirrors etc)

Do you have the same problem or is this my Honda behaving strange?

Thanks in advance,

Savange
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Old 23rd February 2012, 16:11   #2 (permalink)
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On both my civics ive noticed A loud noise from the a/c compressor as it cuts in and out, only noticeable when outside the car , is this what you mean or is there a 'vibration' or just the sound??
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Old 23rd February 2012, 16:32   #3 (permalink)
 
 
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I think it is probably the AC cycling on and off. You dont say which engine is fitted to your Civic, but on my 09 Civic with a 1.4 engine the idling speed is 700 rpm when the AC is off and 900 rpm when the AC is on.

I can also hear and feel the AC cutting in and out.
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Old 23rd February 2012, 16:40   #4 (permalink)
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Thanks for your fast respond.
It is a 1.8 petrol motor and you can hear en feel the vibration inside the car.
I think that it is the compressor going on. But my rpm are variable and not constant 700 rpm with AC off and 900 with AC on.
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Old 23rd February 2012, 16:46   #5 (permalink)
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Quote:
Originally Posted by Savange View Post
Thanks for your fast respond.
It is a 1.8 petrol motor and you can hear en feel the vibration inside the car.
I think that it is the compressor going on. But my rpm are variable and not constant 700 rpm with AC off and 900 with AC on.

Pretty sure thats normal......
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Old 23rd February 2012, 17:14   #6 (permalink)
 
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Sounds perfectly normal. When you're not moving, the fan will switch on to draw air over the evaporator. The fan won't need to come on when you are moving as there will be air getting pushed through it all the time.
The engine will rev more to compensate for the extra load needed to run the AC compressor when you aren't moving. Hope that makes sense!
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Old 23rd February 2012, 17:16   #7 (permalink)
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Yeah thats normal mate, my 1.4 does it all the time and its not even a year old, the only trouble i had was one of the fans was scraping which was rather annoying, but it just needed more grease put on it i think.
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Old 23rd February 2012, 17:59   #8 (permalink)
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Mine does exactly the same thing! and mines 4 months old :P

Perfectly normal matey dont worry about it
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Old 23rd February 2012, 19:22   #9 (permalink)
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Thank you all for the advice!
Good to hear it is normal and to know why this is normal.
I will check the fans just to be sure
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Old 23rd February 2012, 20:00   #10 (permalink)
 
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Eco display Eco display
Everyone says this is normal, but my civic is 5 years old and the vibrations only started about a year ago and it has gotten worse over time. In the beginning i could make the vibrations go away by switching off the AC but now, it doesnt seem to be the issue.
The vibrations arent always there too, sometimes they even get violent. The whole strange thing about it is that my revs sit PERFECTLY still at 700 rpm when its happening. A slight increase in revs when idling cures the problem INSTANTLY but returns when revs drop to idle.
I've already adressed it during a service but they were pretty clueless.
I agree that you notice the AC cycle kicking in but what i'm noticing (and perhaps the OP too) could be something else.
Car does drive fine though. Its just annoying when doing start/stop traffic.
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Old 23rd February 2012, 23:11   #11 (permalink)
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Quote:
Originally Posted by boydy View Post
Sounds perfectly normal. When you're not moving, the fan will switch on to draw air over the evaporator. The fan won't need to come on when you are moving as there will be air getting pushed through it all the time.
The engine will rev more to compensate for the extra load needed to run the AC compressor when you aren't moving. Hope that makes sense!
Condenser...!
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Old 24th February 2012, 07:52   #12 (permalink)
 
 
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Quote:
Originally Posted by Woette View Post
Everyone says this is normal, but my civic is 5 years old and the vibrations only started about a year ago and it has gotten worse over time. In the beginning i could make the vibrations go away by switching off the AC but now, it doesnt seem to be the issue.
The vibrations arent always there too, sometimes they even get violent. The whole strange thing about it is that my revs sit PERFECTLY still at 700 rpm when its happening. A slight increase in revs when idling cures the problem INSTANTLY but returns when revs drop to idle.
I've already adressed it during a service but they were pretty clueless.
I agree that you notice the AC cycle kicking in but what i'm noticing (and perhaps the OP too) could be something else.
Car does drive fine though. Its just annoying when doing start/stop traffic.
When new my 60 reg 1.4 vibrated badly when stationary and the idling speed was a constant 700 rpm. Switching on the lights raises the idling speed to 900 rpm and the vibration stopped. Only really noticed how bad it was after a few weeks when stuck in a long queue caused by roadworks.

After being told it was a normal Civic characteristic the dealer eventually took me seriously and following advice from Honda UK they relaxed the engine mounts. This reduced the vibration but did not eliminate it.

If its getting worse it could be due to engine mounts wearing.
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Old 24th February 2012, 08:30   #13 (permalink)
 
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Quote:
Originally Posted by dodger View Post
When new my 60 reg 1.4 vibrated badly when stationary and the idling speed was a constant 700 rpm. Switching on the lights raises the idling speed to 900 rpm and the vibration stopped. Only really noticed how bad it was after a few weeks when stuck in a long queue caused by roadworks.

After being told it was a normal Civic characteristic the dealer eventually took me seriously and following advice from Honda UK they relaxed the engine mounts. This reduced the vibration but did not eliminate it.

If its getting worse it could be due to engine mounts wearing.
Yes, the engine mounts were on my suspect list. I'm going to try and explain this at my garage, but i reckon it'll cost a lot to change the engine mounts.
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Old 3rd March 2012, 21:32   #14 (permalink)
 
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Condenser...!

haha! I was waiting for someone to spot that!
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Old 3rd March 2012, 22:14   #15 (permalink)
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get your refridgerant charge checked at honda.
overfilled ac will make the whole car vibrate with the ac on.
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Old 3rd March 2012, 23:09   #16 (permalink)
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Quote:
Originally Posted by Relic View Post
get your refridgerant charge checked at honda.
overfilled ac will make the whole car vibrate with the ac on.
And an overcharge of REFRIGERANT could damage your compressor beyond repair...
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Old 5th March 2012, 18:21   #17 (permalink)
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Need I to go to the dealer/garage or can I check this myself?
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Old 5th March 2012, 19:52   #18 (permalink)
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Need I to go to the dealer/garage or can I check this myself?
Unless you have the necessary tools & knowhow, then not a DIY job...
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Old 5th March 2012, 20:20   #19 (permalink)
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My car's air con behaves similar to Savange's

It vibrates at random intervals when the car is not moving and when I enquired about the vibrations at my dealership, they said it's normal when climate control is enabled as the air con kicks in every now and then to maintain the temperature. I also mentioned that whenever it vibrates, it flicks the head lights, rear lights and interior lights very quickly and the dealership said whenever the air con kicks in, it takes a load from the battery causing the lights to flick

Is this really normal?

Last edited by Jonathan W; 5th March 2012 at 20:24. Reason: Additional information :)
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Old 8th March 2012, 15:46   #20 (permalink)
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Quote:
Originally Posted by Jonathan W View Post
My car's air con behaves similar to Savange's

It vibrates at random intervals when the car is not moving and when I enquired about the vibrations at my dealership, they said it's normal when climate control is enabled as the air con kicks in every now and then to maintain the temperature. I also mentioned that whenever it vibrates, it flicks the head lights, rear lights and interior lights very quickly and the dealership said whenever the air con kicks in, it takes a load from the battery causing the lights to flick

Is this really normal?
My Civic used to behave in exactly the same way when standing still. Vibration, RPM change, lights flicking.

Now my AC isn't working at all, left it at the dealers this morning thinking it might need a refill. Turns out the compressor won't start. So now they are going to try to fix it tomorrow, worst case I might need to replace it.
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