Hi. I have a 2015 Mercedes C300 W205 with <50k mileage. My AC was working great until a few weeks ago when it suddenly started blowing warm air. There isn't any cold air coming out of it at all. I would really appreciate your help since I am in Florida and the car is not usable without the AC. l've been to two mechanics and they could not tell exactly what's wrong but wanted to check for leaks, then replace compressor, lines and valves, then replace other things if that wouldn't help. So really just taking guesses.
![]()
![]()
![]()
![]()
![]()
![]()
![]()
![]()
![]()
![]()
I've attached links to the pictures accordingly and also uploaded all the pictures in the post.
Could you please advise what could be wrong?
Is there any way to tell exactly what's causing the issue, if its the compressor, valve, sensor, switch or line blockage?
- The heating works fine, the air is getting warmer when I turn the temperature up.
- The fan behind the radiator is being engaged
- The compressor starts spinning when I turn on AC and stops when I turn it off.
- I checked the AC pressure and the low side is 105PSI and the high side is 110. With engine off, the low stays the same and high is 110 PSI so pretty much the same
- I scanned it with a SnapOn scanner and the codes that showed up for AC are:
- B107D-15 The Additional Coolant Pump Has A Malfunction, There Is A Short Circuit To Positive Or An Open Circuit. (Did not come back on after clearing the codes)
- B10A2-07 The Actuator Motor For The Left BIend Ar Flap Has A Malfunction, There Is A Mechanical Fault (Did not come back on after clearing the codes)
- P0597-00 The coolant thermostat has an electrical fault or open circuit. There ls A General Failure (Came back after clearing the codes)
- B113-15 Temperature Sensor 'Right Footwell Vent' Has A Malfunction. There Is A Short Circuit To Positive Or An Open Circuit. - Current, Stored. (Came on only after clearing the codes)|
- Additionally I ran other tests on the scanner, such as voltage, temperatures etc through Climate Control Data, Actuator Motors and Blower Regulator but I am not sure how to read the data. Below are only a few key information.
- Causes For Shutoff Of Refrigerant Compressor - No Approval Through C.U Combustion Engine'
- Power Request To Component' A9 (Refrigerant Compressor)' (%) - 0.0
- Power Consumption Of Component 'A9/7y1 (AC Compressor Regulation Valve)'(mA) - 0
- A9/7y2 (Refrigerant Compressor Magnetic Clutch) - Open
- B12 (Refrigerant Pressure Sensor)(psi) - 140
- B10/6 (Evaporator Temperature Sensor)(°F) - 104
- B14 (Outside Temperature Sensor)(°F) - 89.6
- Coolant Temperature(°F) - 167
- Supply Voltage of Component 'Governor'(V) - 12.200
I've attached links to the pictures accordingly and also uploaded all the pictures in the post.
Could you please advise what could be wrong?
Is there any way to tell exactly what's causing the issue, if its the compressor, valve, sensor, switch or line blockage?
