Air Conditioner problems 230e W124 euro - PeachParts Mercedes-Benz Forum

peet230e · #1 04-12-2010, 04:55 AM

Good Morning to all of you. I am new to this forum but have been driving MB's since i got my license! Problem i am having now is with a W124 230E 1991 Euro.
When you swith on the air conditioner, you can hear the "ssssssss" sound the refrigerand makes as it passes through the evaporator. This sound is continous and no cooling takes place, although the compressor is running with its clutc engaged.

Refrigerand levels is correct had it presurre cheched over the weekend.

could this be that the expansion valve is open the whole time and is not ****tioning correctly? Or could it be the compressor its self (I doubt since the car only has done 90K miles.

Second problem is with internal blower motor, it while only come on on the number 3 and 4 setting e.g. high speed. The lower speeds e.g. 1 and two does not work. Is this a problem with the resistance?? and where is it situated. Any help would be greatky appreciated. Thanking you in advance

peet230e · #2 04-12-2010, 09:42 AM

Anyone willing to take a guess?? Guy at the shop where i had the car just now wants to fit new compressor, dryer, expansion valve!! $$$$$$

peet230e · #3 04-13-2010, 06:11 AM

Anyone, someone please????

johnathan1 · #4 04-13-2010, 06:16 AM

I would take a look at the expansion valve. Or I suppose there could be a blockage somewhere in the system. A good AC shop would know what the problem is right away.

peet230e · #5 04-13-2010, 06:20 AM

I am going to replace the dryer bottle and expansion valve, its cheap enough, and flush the system to make sure nothing is blocked. I think that should do it??

macdrone · #6 04-13-2010, 01:27 PM

Pod failure at the blend door letting no cool air into the car. Lots of pod issues at this age of the vehicles.

#7 04-13-2010, 01:40 PM

Remove the glove box liner and look for a vertical manifold at the lower right of the glove box. Use an auxilliary vacuum source and remove each line from the manifold one at a time and see if they all will hold without leaking. These are the lines to the vacuum pods under the dash.

All the time you're doing this, cross your fingers and hope that they all hold. If one is leaking you have a bad pod under the dash. To repair it, you will have to remove the dash. Don't even dream about replacing only the leaking pod, replace them ALL because it is a 15 hour job.

The other thing to check is to make sure that there is no coolant flow to the heater. With the engine warm and all a/c controls on max feel of the line into and the line out of the heater control valve near the battery. It should be hot on the input side and not nearly as hot on the output. If the output is hot, then you need to start checking the climate control and it's signal to the heater control valve.

Hope this helps,

peet230e · #8 04-14-2010, 08:48 AM

Thanx Larry, but the pipe on the aircon compressor that usaully gets ice cold during operation, is not even a little bit colder with the compressor running or not. This tells me it is a refrigerand problem?

The other problem i have is the blower motor not comming on on setting 1 or 2 only comes on if knob is turned to 3 or 4, what can cause this, obviously not the blower motor its self because it is working on setting 3 and 4??