1996 e320: A/C warm at high speed and cold at idle - Page 3 - Mercedes-Benz Forum
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post #21 of 25 (permalink) Old 06-18-2019, 09:31 PM
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I disagree what mrboca sees in his crystal ball.
Evaporator at 10C= 45F is clear evidence that the compressor is running and cooling.
I think Witek's crystal ball is way better as it has a point, but again, lack of spending 90 seconds for proper troubleshooting opens the way for a book of guessing.


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post #22 of 25 (permalink) Old 06-19-2019, 07:59 PM Thread Starter
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I completed the diagnostic exactly as recommended and here are the codes.

Eb1 226
Eb1 232
Eb1 234
e ff

Based on what I can find, I understand this to mean that the issue is the Refrigerant Pressure Sensor? (And also the in-car temp sensor, and sun sensor?)

I am not sure what the e/ff message means

Thank you all for your help!
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post #23 of 25 (permalink) Old 06-19-2019, 08:05 PM
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Reset the codes per item 9 in the instructions (press and hold both AUTO keys till it resets to ff)

e ff means end of the list. If the faults clear and do not come back (do the test again), then the faults are likely transient.

If the faults persist, get them ( refrigerant pressure sensor and the in car temp sensor) changed. Sun sensor does not really matter much.
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post #24 of 25 (permalink) Old 06-19-2019, 08:18 PM
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As I said ALWAYS start with the fault codes, if you have a fault in the refrigerant pressure sensor or the refrigerant temp sensor, this is detected by the controller.

When the controller starts compressor, it checks changes (increase) in the refrigerant pressure and temp readings. If it does not see plausible values, it will declare that the appropriate sensor is faulty.
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post #25 of 25 (permalink) Old 06-19-2019, 08:20 PM Thread Starter
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Thank you. I appreciate your help!
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