7B
A loud noise is heard at a certain rpm, disproportionately to engine revolution
There are various types of noise, ranging from those produced in the engine compartment to those from the passenger compartment, also from rumbling noises to whistling noises.
Abnormal Noise from Compressor
Condition Possible Cause Action
A loud noise is heard at a certain rpm, disproportionately to engine revolution
Loose or faulty compressor drive belt
Adjust drive belt tension, or replace belt.
Loose compressor mounting bolts
Retighten mounting bolts.