Nate654

I have a 2002 clk 430 w208. I had my ac recharged a month ago and only one fan was working the drivers side fan. Now i cant get my fans to come on at all??? Any help would be appreciated. Im thinking i had a leak because freon was empty when i had it charged. It has the dye in it so im taking it back to the shop. I can still get it to blow a little cold at night. Im not running it because i dont want to burn anything up... The passenger side auxillary fan seems real hard to turn and has never worked...any suggestions? I ordered a new one.. Also how hard are they to put in...

cindyclk

Do a search on both MB forums sites...you need to access the computer, find the codes (low freon will stop everything so that it does not burn out), then clear the codes....usually works.

Nate654

I did that and it worked fan is on ac is blasting cold air thank you. I put it i. Diagnostic and number 7 shows 21 at idle. Is that a good number forcfreon at idle???

MarcusF

For anyone who stumbles into this thread down the road, the secondary fans (electric ones behind the grill) can be tested independently of the AC - with the car off, insert the key and turn the ignition to the second position (where the dash lights are illuminated). Immediately press and hold both climate control "Auto" buttons for about 10 seconds and then let go - BOTH black auxiliary fans should turn on. If only one fan spins, you may have a problem with the fan itself, the fan relay or a circuit to the fan. The fan will normally turn on at approximately 103 degrees Celsius. It will shut off at approximately 98 degrees Celsius, but doesn’t run with the car turned off.

As for the AC diagnostics showing 21, that sounds incredibly high. If someone did it at home, I’d guess they forgot to take into account the ambient air temperature while charging the system. Since you went to a REAL AC place, they probably didn’t overfill it because they know an overfilled system doesn't cool well and will eventually blow the seals.

IMHO, the best way to determine if the AC is working well is to test the vent temperatures. That is what you care about,right? The temperature of the air leaving the vents? You may also want to know the temperature at the EVAP sensor.

Yes, that picture has been known to drive some people off the deep end.

Nate654

Markus F.. Thanks for the information provided. My passenger side fan is still not working it seems hard to turn by hand... I ordered a new one... My car temp normally never gets above 95 degrees Celsius it's never went over the 100 degree Celsius mark. Air is blowing cold I'm taking it back to the shop tomorrow to have them hook it up and check the levels of freon. On one thread I read where it should be 22 on high side for diagnostic number 7 when at idle after you start it but that it goes down as you drive. ??? What's yours read at idle?

MarcusF

Pressure fluctuations are normal. When my car is started, and the AC is turned on, without touching the gas and idling at 500 RPM, the pressure sensor reading is as high as 15. It drops to 7 while driving, and is commonly at 11/12 while waiting at lights.

Chadzu

I just replaced my compressor and I was seeing 30-35 psi on the low side and 200-250 psi on the high side. The readings would drop when the fan cycled on and would go up when it shut off. Converted to bar its around 13-17.