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Car shaking when ac is on high.
1997 Buick Park Avenue

Car shaking when AC is on high.

(1997 Buick Park Avenue)
When the AC on low/med settings, the car doesn't shake. But when AC is on high setting car shakes and makes loud fan noise. AC compressor was replaced by the original owner 40K miles ago. Car is @ 137K miles.
Tags: buick, park avenue
2 answers & 1 comment
Popular Answer
on October 11, 2019

Agree - blower motor (assembly) is prime suspect - have even seen mouse nest inside fan blower wheel that will cause vibration - this will also be more pronounced the higher the fan speed.
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on October 11, 2019

And this will certainly result in a “loud fan noise” !

Good luck!
General Diagnosis
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on October 11, 2019

Agree - blower motor (assembly) is prime suspect - have even seen mouse nest inside fan blower wheel that will cause vibration - this will also be more pronounced the higher the fan speed.
Sign in to reply
on October 11, 2019

And this will certainly result in a “loud fan noise” !

Good luck!
on October 11, 2019
It's very odd the whole car is shaking but check out that blower motor. If that's not it maybe it's misfiring under the load of the ac system. This will require a hands-on inspection at a shop though.
Use this link to find a good shop near you.
https://repairpal.com/repair-shops
Alex
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