I have a 1984 190d. When i start driving in the morning, everthing seems to work perfectly, the compressor kicks in and out as the coil cools and reaches the proper temp. The problem comes mostly when i have been running for a while. as long as i am going 1500 rpm or better the compressor works perfectly. as soon as i stop at a light it will cut out. The only way to get it to go back on is to completely cut the car off then re-start it. I thought it might be the rpm sensor on the compressor not reading correctly, but it does work at higher rpm's. I have checked all wires on the compressor, i have put a new belt on, and also changed the shock on the tensioner wheel to make sure that the compressor is not slipping. Does anyone have any ideas? what i am doing now is when i am getting ready to stop or slow down i turn off the system until i start going again, then i put it back on. the only problem is that driving through town in traffic, the system has to stay off more than it runs. so why run it at all, I live in south louisiana, so right now its like 90+ degrees and climbing......HELP, before i die of heat .....

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1984 190D 2.2 (the real one not the 2.0 bored out)
1994 Saturn SL1
1994 Jeep Cherokee 4.0

Could be your refrigerant level is low.

The following simple test is in the 1984 Maintenance Manual section 8312, and is typical of all cars with AC systems.

- Start engine and run at idle speed.

- Depress button switch "DEF" [This will engage the compressor.]

- Check fluid level as follows: Pull off one electrical lead on low-pressure switch [Either of the insulated spade terminals.], electromagnetic clutch should then switch-off and refrigerant should flow back into the receiver-dehydrator.

- Reattach electric lead, electromagnetic clutch should now switch-on again and refrigerant should flow free of bubbles past the sight glass.

- In the event of foam or bubbles, there is not enough refrigerant in the system.

The receiver-dryer sight glass is located in the engine room just behind the LH headlight assembly, and the low pressure switch with two insulated spade terminals is right next to it.

Duke

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I am not sure about your 201 chassis car, but I think it has a temp sensor fan that draws cabin air across the sensor. If this is not turning, the system will do all sorts of strange things.

On the 124 cars the fan is behind the glove box or somewhere around the console. It is very small about 1" in diameter and about 2" long.

Hope this helps,