Hello,
I am having an A/C cooling problem with my 1986 w201 190e 2.3-16v.
It cools for a while then goes warm. After it sits off for a while it will go cold again. Seems like the compressor is turning off once it has been on for a while.
First a few questions. It has been converted to R134. How many pounds or how much R134 should be put into the system from a vacuumed down system? Also how much oil and what type of oil? I have hear that is takes about 10% less R134 over the R12 original. I am thinking that th system maybe overcharged since freon got added since it was filled. It may have a very slow leak, but it may not have the correct freon charge in it now. I have a set of gauges, a vacuum pump, and access to R134 freon. I just havent worked much on my Mercedes AC systems. I was working fine last season. When it does blow cold it blows decently cold and the volume of air is fine. It needs the fan motor replaced, have a new one but not done yet, due to a squeal and it doesnt always turn at the lower speeds until I move it to max fan speed to get it moving.
Christopher

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red

You should go ahead and replace your blower motor, since it does stick at low speeds... If you don't you will be replacing the speed control, too.

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My first Mercedes Benz. 4/6/07.

1984 190E (201 024) 2.3L four.

I'd get the gauges on it and see what the system is doing.

Could be low on charge?
Could be a switch problem (low/high pressure)
Could be evap temp sensor causing the climate control unit to kick off the compressor?

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