Vibration

[rontnak]

Hi All,
I did my yearly cleaning of the condenser and radiator of all the debris that gets sucked in. After placing the front bumper cover back on and making sure no screws were left over I notice after driving the car with the AC on I get a bad vibration from the ac fans. Just coincidence that it is going out or could I have not tightened down something from the condenser cleaning. Note that if you are familiar with the cleaning of the radiator you do not touch or loosen anything on the cooling fans. is it just coincidence that that the fan is vibrating or did I do something wrong. Any ideas?
Thanks

[BoxsterSteve]

You might have missed a condenser fastener on one side.
Could conceivably cause the vibration you mention.
Looks like you're taking it apart again...