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  1. AC not working very well

    W210 E-Class
    Something is not quite right. When I charge form an R134A can, using the cheap pressure gauge that came with the can, I can only see 10 psi. Perhaps I need a lot more refrigerant. Since I see no leaks and I have had the car for 10+ years and nothing has been done to the AC system, I am...
  2. AC not working very well

    W210 E-Class
    Yes, the readings were done immediately after start. About a 1/4 to 1/3 of the can was still left. Driving back from work, the system did produce cold air but after about 8 miles it started producing not so cool air and then the system started cooling again. I can take the readings after a 15...
  3. AC not working very well

    W210 E-Class
    Interesting comment Kajtek1! A little insulting to someone who spent most of their life designing computers and storage devices, but hey keep an open mind.The readings I reported are not made up, but you scare me so much that I spend most of my time making sure I report them them well and type...
  4. AC not working very well

    W210 E-Class
    Sir, If I could explain the data why would I be writing on this site ? I ma not an AC engineer. The reason for setting to LO LO is to get the readings that you asked for. I think that at least some of the readings inteh list I provided are irrelevant to my problem, so which readings do I really...
  5. AC not working very well

    W210 E-Class
    Kajtek1, I am puzzled by the MBZ AC logic. If I set the AC to LO,LO and the temp is around 75 F in the car, I would expect the compressor to run continuously at a high pressure level until the temp drops below the "LO, LO" range. However, I see the compressor starting off at a lowish value (...
  6. AC not working very well

    W210 E-Class
    Kajtek, thanks. I saw traces of green along both edges of the condenser. Since I am doing this fr the first tim, I was not sure if I had a problem or not. Thanks for directing me better.
  7. AC not working very well

    W210 E-Class
    I found a 3 oz can of dye. It has 1 oz oil and 2 ounces of dye. I measured the initial refrigerant pressure well over 12, and I saw traces of the dye along both the sides of the condenser as well as seeing specs of the fluorescent dye peppered over the front surface of the condenser. Clearly the...
  8. AC not working very well

    W210 E-Class
    There were error codes, EB1416, but they are cleared. There is no permanent EC I can see the center of the compressor spinning -- so engaged.
  9. AC not working very well

    W210 E-Class
    Kajtek1, I have a 12 Oz can of R134A and a 3 Oz can of R134A with dye. If I use both, will there be any problems like overcharge that I have to worry about ?
  10. AC not working very well

    W210 E-Class
    Hirnbeiss, I am wondering if I should get a leak test before I evacuate and recharge. Agreed that he price of Evac and recharge is not so high, but bit of a pain taking it there and back. Before I get R134A into the system, should I try to rent the vacuum pump and gauges to see if the system...
  11. AC not working very well

    W210 E-Class
    Correcting some readings and providing explanations for values read. Apologize for posting incorrect engine state and data. I was using Excel to make sure that I had the correct number of values in each column. The following should be correct. The text in LH column is what I found on the site...
  12. AC not working very well

    W210 E-Class
    Kajtek1, I get the following readings with the new ECT. Engine ON cool Engine OFF cool Engine OFF cool Engine ON cool Temp on gauge 73 Temp on gauge 73 Temp on gauge 85 Temp on gauge 85 75 75 121 123 71 71 84 84 76 73 100 100 76 71 100 100 75 64 100 93 80 87 105 109 5 8 7 11...
  13. AC not working very well

    W210 E-Class
    I replaced the ECT. It was definitely one problem with the system as the previous replacement always showed the coolant temp being below 80. Now it shows it at eighty once the car is warmed up. My AC is still not very efficient. It does cool but not as good as the other cars I have -- one of...
  14. AC not working very well

    W210 E-Class
    Based on information form the diagnostics, my Coolant temp varies between 90 and 202 C. There is no CEL, and although the readings change, clearly 90+C at start is too high. Initially, I thought it might be in F, which seem OK in San Jose, CA at this time of the year. I did replace this sensor...
  15. AC not working very well

    W210 E-Class
    Kajtek1, Is it something I can replace or is the sensor part of a unit that I need to replace? Any chance you can point me to a DIY ?
  16. AC not working very well

    W210 E-Class
    I have a problem with my AC system. I do not see any error codes from the diagnostics. However, the cooling still not good and I made some measurements with : 1. Car engine on started first thing in the morning.(Column 1) 2. Car engine off after sitting overnight.(column 2) 3. Car Engine Off...
  17. Automatic Climate Control Diagnostic Trouble Code (DTC) Memory

    W210 E-Class
    Ok, I will start another thread and post the measurements you suggested, Europe did switch to the metric system a long time ago and the French and Germans complied quickly; the British are a stubborn lot who follow the imperial and metric system simultaneously.. Its the reason why tire pressure...
  18. Automatic Climate Control Diagnostic Trouble Code (DTC) Memory

    W210 E-Class
    Thanks Matt. I appreciate your help. I do have all the instructions I need to do this job. I really do have a Ph D from England -- earned not honorary! -- its in Computer Architecture. Most of the time, I do these jobs on the car as a learning exercise as well as the satisfaction of DIY...
  19. Automatic Climate Control Diagnostic Trouble Code (DTC) Memory

    W210 E-Class
    Matt, I get it now:( Ambient at 25 C approx 80% RH) Center air outlet temp is much higher than the 5-7 C expected(41 F) Clearly I have 1 BAR higher pressure on the LO side. HI pressure is also higher than expected at around 210. Not sure what the refrigerant temp is -- I guess I can read from...
  20. Automatic Climate Control Diagnostic Trouble Code (DTC) Memory

    W210 E-Class
    Matt , I am trying to understand this document while converting BAR to PSI and F to C. If I get it right then at 25C, according to the first diagram the Lo and Hi should be very similar at around 70 psi. Mine is at approx 48 PSI Lo and 250 on Hi side -- compressor is bad ? For the other...
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