wawago

Hi, my 2001 E320's AC is not blowing cold air when driving under 40mph especially, in heavy traffic. However, when driving above 40mph like driving on freeway, the ac starts to blow cold air normally. I did some research and diagnostic tests. Here is what I found:
EB1234- Sun sensor
EB1416- coolant circulation pump
after erasing the codes, they came back after one day of driving.

Additional reading:
morning 75 degree (ambient); engine not running; car sat over night
1. 71
2. 69
3. 82
4. 82
5. 80
6. 182
7. 06 - 09
8. 84
9. 48
10. 6.0

Afternoon 91 degree (ambient); engine running; immediate started after 35 mile-drive.
the range: when first started and gradually increase after 2-3 minutes of engine running.
1. 100 -> 109
2. 109 -> 114
3. 161 -> 173
4. 71 -> 102
5. 73 -> 93
6. 199
7. 14
8. 123
9. 35
10. 2.7

Could someone who is an expert in AC help me diagnose the problem? Thank you.

wawago

Sorry guys, I sat the driver side temp to Hi and passenger temp to Low. I should have set it at 72 degree on both sides. Outside is cool now. I'll post a new set of afternoon #'s tomorrow with the correct temp setting.

Rick

Plutoe

When you post the correct data also clear all the faults and post the actual values!!

wawago

cleared all the faults, same faults again:
EB1234- Sun sensor
EB1416- coolant circulation pump

morning #'s were good
morning 75 degree (ambient); engine not running; car sat over night
1. 71
2. 69
3. 82
4. 82
5. 80
6. 182
7. 06 - 09
8. 84
9. 48
10. 6.0

new afternoon #'s, 85 ambient
1. 78
2. 75
3. 71 - 76
4. 66 - 73
5. 75
6. 191 - 206
7. 08 - 07
8. 87 - 91
9. 37
10. 1.5

Thanks

Plutoe

You either are extremal low on refrigerant or your compressor can't make pressure--7 should be 15 to 18!!

vinceC

At what vehicle speed are you taking those readings?