I have a 2001 Mercedes e430 4matic I have been trying to find out the problem with my a/c without paying 230$ at the dealership. My a/c is not blowing cold and it only blows hard when it wants to. I ran the flap test and went through all the flaps and put them on high but it did not stay, I also ran the diagnostic through the climate control but the codes don't make sense
B1234 sun censor
B1235 emissions censor
B1416 coolant circulation pump
These are the codes but what do they have to do with my a/c not being cold? Plus my climate control when in defrost only goes on high(heat) and only blows on high(fan) but the auto works fine but like I said is not cold and the flap test when I switched it to high cut the car off and came back it was as if I never did anything! Can someone please help me I know it's going to be a hot summer and I need a/c! Thank you

 

I'd start with the sun sensor. This little device usually up on the top of the dash will let the A/C know how hard to work to cool the car. If it's not working, and thinks its nightime all the time, the A/c gets confused.
Emission sensor is usually an O2 sensor in the exhaust, should cause a check engine light.
No clue on the coolant pump.

 

Ok I replaced the censor and reset my climate control do you know how long before its starts blowing cold? Because the a/c is still blowing warm and I bought a brand new censor

 

The effect should be immediate, if that was the problem. Were you able to recheck the codes? Did the B1234 clear itself? Did you try clearing the codes? If you still get the Sun Sensor code after a known good replacement sensor is intalled, the issue could be a bad wire or connection in that circuit.

Are you sure that your A/C system has Freon in it? Is the charge amount (pressures) corrrect? Is the compressor kicking in and turning the pump? At this point, if you can't answer all of those questions, $230 sounds cheap.