RepairPal is your advocate for car care advice and guidance

Q: Air Conditioner Auto/Auto Max creates loud humming noise in the radiator fan on 2003 Mercedes-Benz E500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
When turning the air conditioner to auto or auto max the radiator fan makes a loud humming noise as well as the back seat air vent start blowing hot air. The front air works fine.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more
Your condenser ( on the radiator ) fan sounds like it's worn out. The hot air in the back seat sounds like the A/C is low and needs a charge.
Had the problem with hot air blowing into the rear compartment from the vent in the console. Console was so warm, it was how we noticed the problem. Local Mercedes dealer replaced the control valve for the rear vents. It is a $35 valve that will cost you $400 to have repaired.
Didn't find what you were looking for?