Based on the chart, my charge (using gauge on low-side) is full to slightly over-full.
The issue I have is the compressor will kick in, refrigerant pressure rises, evaporator temps fall, then a wall is hit and and the values reverse themselves. This pattern occurs regardless of ambient temperature.
Prior to adding some r134 a couple of weeks ago, evap temp would fall to about 41 (with noticeable hissing). Now it struggles to get to 49, and mostly bottoms at 53 before rising. Coldest temps are at idle, particularly after coming to a stop; and then upon accelerating out of that stop.
Seems that either the compressor is shutting itself down; or a sensor is doing it.
Quote:
Originally Posted by Diseasel300
Certainly sounds like that fan motor was singing its last hurrah. Not being familiar with the 210 Climate control, I can't help you further in troubleshooting the CCU/fan module issue. It could be one or the other, or something unrelated entirely, who knows! I try to avoid computerized controls as much as possible, they're such a pain to troubleshoot when something goes wrong.
As far as the A/C performance is concerned, wait for a hot day (85˚+) and check the charge pressures. Make sure when you're checking, you have all 4 windows down, blower on high, temp set low as it'll go.
I know some "supertech" will come along and flame me for even suggesting it, but a decent "rule of thumb" pressure chart against ambient temps will get you close:
Note that the pressures given in that chart assume the car is idling without any additional airflow over the condenser from a separate fan. It also assumes maximum load on the system.
If your high side is within 50 PSI and your low side within 10-15 PSI, you're probably close enough on charge. If you find you're way out, add refrigerant through the low side port a bit at a time. After each addition, wait for the system to stabilize for a couple of minutes and watch the head pressure (high side). As you get close to the lower limit of head pressure in that chart for your ambient temps, slow way down and let the system do its thing. You can very easily overcharge the system and that'll kill your performance more than being slightly undercharged. It can also kill your compressor! |
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2008 E350 4matic / Black/Anthracite
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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
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