I’m revising this thread to reflect some new developments in hopes that others will weigh in.
I’m back with another problem on my '03 Liberty Sport. 98,000 miles.
Lately I’ve been noticing that whenever I have the defroster or AC on, I get a low-pitched, roaring sound coming from the front end of my jeep.
I stopped by the shop today. Diagnosis was that I needed a new fan module. $410 part. The mechanic said that when my AC compressor kicks in, the fan has to rotate at a higher speed. He said there were some busted parts inside the fan, and when it runs at a higher speed, it’s vibrating excessively.
OK, so I decided to get a second opinion. Another guy looked at it, and told me that the fan wasn’t the problem - he said the AC compressor was bad. His reasoning was that when the compressor’s electrical power was disconnected, the noise went away. He said he thought the fan itself was fine.
After that, I went to one more shop. Didn’t tell him about the previous diagnoses, just explained the symptoms. He also said it was the AC compressor - and that it sounded like one of the freon lines was plugged up or something.
I’m surprised about the compressor, because I just had the whole compressor / AC accumulator replaced (and had the lines flushed) less than two years ago. The replacement compressor wasn’t remanufactured - it was new.
I posted a short video clip demonstrating the noise further down in this thread.
So basically at this point, I’m trying to figure out how to move forward. Given the car’s symptoms, which diagnosis do you trust more?