This short video shows the location of the W220 S500/S430 Evap Temp Sensor in the driver footwell and how to replace it.
If your A/C suddenly starts to blow warm air, your Evap Temp Sensor may need to be replaced.
If your S class A/C works for 10 minutes and then dies, and if this behavior continues every time you reset the A/C faults (video shows how to reset errors), you most certainly need to replace your Evap Temp Sensor.
You should also replace it as a very cheap maintenance item if your mileage is above 100,000 miles.
Part number is 220-830-07-72-M6 - you can purchase the Behr model from Pelican Parts at $16 as of 8/24/2019.
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Mercedes S Class Evaporator Temp Sensor Replacement
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Mercedes Evap Temp Sensor DIYW220 Evap Temp Sensor ReplacementS500 Evap Temp Sensor ReplacementS430 Evap Temp Sensor ReplacementS500 DIY Evap Temp SensorS430 DIY Evap Temp SensorW220 DIY Evap Temp SensorMercedes DIY Evap Temp SensorMercedes A/C FaultMercedes A/C blowing warm airMercedes A/C not workingS500 A/C blowing warm airS430 A/C blowing warm airW220 A/C blowing warm airS500 AC blowing warm airS430 AC blowing warm airMercedes B1241 and B1270
