WHAT AUSES THE A/C MAKE A LOUD HUMMING SOUND ONLY ON HIGH SPEED
2002 Pontiac Firebird • 77,000 miles
A/c set at coldest has 4 speeds no noise but just on 4th speed
If the loud humming noise is coming from the blower fan motor then sounds like you have a bad bearing in the motor etc.
Have you dropped the motor and checked the squriel cage for leaves debris etc?
I took off the glove box to get to the motor but I dont know what it is but its in front of the heater core when I masshed it the humming sound quits any idea what it is I posted pic what it looks like
Thats a bad pic can you take a actual pic of it and post it or email it to me?
Jul 13, 2012.
Jul 13, 2012.
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