Recently I am experiencing the car starting to vibrate hard and even hearing knocks around the engine bay after I turn on the A/C button. Anyone around here had this problem before or know what's causing it? Or perhaps I should just take it to the dealership? Thanks.

 

uhm... you might fix this by getting a grounding kit... at least it made my ac run better... i wanna say it's normal but knocking isn't ever a good thing.

 

Yeah...the engine lugs a bit at idle with the A/C on...it's normal...you can try a grounding kit, though...

 

take it to the dealer, that way if it is making an abnormal noise they can tell you what really going on. the ac will make a clicking noise but all ac systems do, the vibration i would be worried about

 

This is not normal. Take it to the dealer and have them look at it.

 

I agree with the majority hard shaking/vibration/knocking around in the engine is bad. But if it is just a little rattle/engine lug mine does the same thing and I have not had a problem with it at all. I would only take it to the dealer if you think it is major.

 

Might be a bad a/c compressor. Take it to the dealer and they'll probably replace it.

 

Some lugging is normal...but if he's getting really bad knocking, then that's another thing entirely...

 

my car does the exact same thing!! However i haven't tried it with turning on the A/C. But it happens when i turn on the defogger for the windows. If you find out whats wrong with it, let us know.

 

The A/C compressor runs when you use the defogger.

 

The a/c compressor doesn't run unless the a/c button is turned on. The a/c button tells the PCM to turn the compressor on, so without the PCM request the compressor is not on. If the car vibrates and knocks only when you turn the a/c button on, is safe to say that the two are related.

 

Thanks for the replies, I am pretty sure this isn't normal because it started doing this just recently. Again, the shaking/vibration and the engine noise doesn't seem to start untill I hit the A/C button on. I will take my car to the dealership and see what they tell me.. and let you all know. Thanks again.

Richard

 

Richard you need to come to the meets this sunday and next sunday. It's only started to do that because it just started getting hot! lol