2007 Mercedes-Benz S550 Q&A
2007 Mercedes-Benz S550 Question: Are there problems with air conditioner freezing up?
42,000 miles with no prior ac issues other than blower motor failure at 40,000 miles. On recent trip, the airflow diminished to barely detectable after 2.5 hours of a road trip with both thermostats on auto at 77 and an outside temp in the upper 80's. The fan speed would audibly increase with higher settings without increase in flow. Returned to normal after parking an hour. Functioning normally since on local trips. - spearmanmd
I have an 07 S550 with 33k and it did the exact same thing today with same symptoms after long road trip. Airflow returned to normal after being parked for a while. - whaler23
My 2007 Mercedes S550 with 19,875 miles also froze up after 5 hours non-stop on a road trip. Stopping for 30 minutes allowed the ice to melt, but on my next 5 hour leg, it froze up again. MB of Georgetown, TX said the freon level was correct, but replaced the Temp Sensor in the Heater control box. That did NOT fix it. On my return 5 hour non-stop drive, it froze up again. Stopping once again for 30 minutes allowed it to work for another 3 hours before it froze up again. MB in Montgomery, AL replaced the blower motor and blower control relay, suggesting resistance was building up in that particular system, slowing down the blower motor, and thus allowing the evaporator to freeze up. Will be taking a long drive this weekend to see if that cleared it up. - Timelss