I bought a certified 07 LT a few months ago. I did not fully test the AC system that time. Recently I need to run the AC to its 100% in day driving, and notice some vibration from the gas pedal.

The gas pedal already vibrates when the AC is off, even if it's in neutral, and vibrates harder when I accelerate form 30-60mph. I know there is always some vibration, but it's more than my old car (17yrs old when I replaced it with this HHR.) It's kinda like a small massage device under my foot. I talked to the dealer, yeah, the dealer said it's normal.

When I turn on the AC to 100%, the vibration becomes at least twice harder, making my right foot a little uncomfortable. I did some test, the compressor and the speed of fan both contribute to the vibration. Do you guys have similar experience with your HHR?

Thanks.

 

No vibration at all on mine.

 

Never had any issues like that.... would just take it to a dealer, must be a warranty thing.

 

The HHR is a "drive by wire" vehicle so the gas pedal has no mechanical attachment to the engine. Any vibration that you feel can only be attributed to the gas pedal itself, not the engine or A/C. If the engine is running poorly and vibrates the entire vehicle, then the gas pedal may vibrate. I'd look elsewhere for the cause of the vibration.

Pat