Air conditioner in 2003 s500

Asked by MrS500 May 11, 2018 at 11:13 AM about the 2003 Mercedes-Benz S-Class S 500 4MATIC

Question type: Maintenance & Repair

AC was working fine and I took a long road
trip and it just quit on me. What could be the
reason for this

1 Answer

7,605

Could be anything from low Freon to a faulty sensor. You'll have to get some gauges and see the high and low side pressures. If there are no leaks and the system is holding refrigerant then you might be looking at a sensor issue such as a low or high pressure switch, evap temp sensor, etc. Other thoughts are compressor clutch is not engaging due to either faulty clutch or coil, perhaps bad fuse or relay. On some Mercedes climate control heads you can do a basic diagnostic of the climate control system not sure if this would apply to yours. So that's all the ideas I have. Good Luck!

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