My 92 civic nickname "The Baby Car" vibrates with the a/c on. It began when the a/c compressor was changed. What could it be? If I turn the A/C off you cant tell its on, simply quiet and smooth. Also it doesnt accelerate the same with the a/c on, I have to turn it off to speed up from a stop light.

When I drive at 65 and up the steering shakes bad. What could this be?

 

Sounds like somethin wrong with "The Baby Car's" compressor.

 

I bought it new, I will have it checked. Do you think thats the only thing?

 

I'm guessing. Could it be over charged system? Did you check for proper operation of condensor fan? Take the car to the shop who did the installation is what I would do first........

 

The steering wheel shaking is possibly caused by your wheel being unbalanced, having them balanced should fix it.

 

Thanks, will try getting it balanced