mercedes w205, engine overheating with a / c on!
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Joined: Jul 2022
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mercedes c-class w205 2015
mercedes w205, engine overheating with a / c on!
hello everyone, the problem is already 3 years old, the engine overheats with the a / с on, it often happens on the highway and in eco mode (but I think it doesn’t matter), it heats up absolutely randomly, usually after 3-5 miles,it happens 10-15 seconds to the red zone, also for 10-15 seconds after turning off the a / c, it comes into working condition 80-90, after turning on the air conditioner, overheating was again after 15-20 minutes.
I changed absolutely everything, the pump, the thermostat, the fan works well, I cleaned the radiator 2 times, updated the firmware, the air conditioner blows cold, so I believe that everything is fine with the compressor, today I replaced the compressor valve, there was an error on it, but it did not help, overheating after 5 km again.
computer check did not give any results
also, coolant level is ok
Mercedes Benz c300, w205, 2014-2015, 71,5k miles.
https://youtube.com/shorts/UXH42fG6rFI?feature=share
I already hate the brand "MB"
I changed absolutely everything, the pump, the thermostat, the fan works well, I cleaned the radiator 2 times, updated the firmware, the air conditioner blows cold, so I believe that everything is fine with the compressor, today I replaced the compressor valve, there was an error on it, but it did not help, overheating after 5 km again.
computer check did not give any results
also, coolant level is ok
Mercedes Benz c300, w205, 2014-2015, 71,5k miles.
https://youtube.com/shorts/UXH42fG6rFI?feature=share
I already hate the brand "MB"
Last edited by kyrylo; Jul 15, 2022 at 08:03 PM.
Out Of Control!!
Joined: Apr 2019
Posts: 11,934
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
bad connection!
I've read through your thread. You're saying you're overheating in red temp zone. You've replaced a comprehensive set of parts without immediate success.
>> Good chance your engine TEMP Sensor is leaking coolant in its connector.
Oxidation is creating poor contacts. Closely inspect visually + observe live data with scanner or replace
The fact you are reaching the Red Temp zone means it's NOT the A/C pressure switch.
