Question about 1997 Mercedes-Benz C-Class

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My air conditioner won't blow cold air. It just blows air.

How do I add freon to my 1997 mercedes benz c280? Thank you very much for answering my concern.

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Hello I'm a M.B. tech. 1st you need to know why the freon is low. Hopefully it just needs to be serviced. There is a component located in the lf of the engine compartment called a receiver drier. It soaks up the moisture in the freon so the gases can work the way they are supposed to. On this unit there should be 2 switches(I believe they were combined into one switch in 98. 1 switch is a temp switch that operates your electric fans, the other is a compressor cutoff switch. Assuming the compressor is not coming on-take a fused wire and bridge the 2 contacts- If the compressor does not come on at all there is another problem(it is not low on freon. On the condenser there is a high side port(it is the bigger of the 2)By the brake master Cyl.(lf of the engine compartment thereshould be a smaller low side valve in line with the fuel cooler hose. Usually you can hook up a machine to the low port and **** freon in through that port. Assuming you do not have a refrigerant machine. It is very self explanatory on the bottle of r 134a refrigerant which can be purchased at your local auto supply store. I would start with 1 lbs. and add dye with the freon in case there is a big leak. If the system is overcharged it will not cool properly. I believe the system capacity is approx. 2 lbs. Add a few ounces after the first pound until a/c system is cooling properly and the electric fans are also coming on when the system gets to high. If you get a can with a good Gage set on it you should see the high side between 150 and 2000 psi(fan coming on at max. press.) also the low side should read about 35. It is about the temp of the evaporator which is i=located in the dash and the blower blows through this component out through the vents. Hopefully I have been helpful.

Posted on May 28, 2009

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Hello,good day,adding freon gas is not allowed, if you have the refilling machine or station and technical knowledge, you can do it,first suction the remaining freon,then evacuate or vacuum the system,add oil in your system if necessary (amount of oil is depends what part it replaces,it is written in our tech. data)amount of freon is written in your hood with green level,better to have pressurized freon during refiling,only charge freon on high side with full amount of freon,start your engine,switch your aircon,observe your aux.fan,first stage activated by your freon gas(12 to 15 bar)second stage activated by your engine temp. 100 to 105,,ty

Posted on May 30, 2009

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