Thanks...that does help.. the 190E I have has the two elec fans and yes they are both working, just not as often as I think they should. And, they do not neccessarily turn on when the ac is turned on. I have seen the effects of the low and the hi speeds like you said. I rplaced the temp switch today and the result was not much different, however the AC is not particulary cold so maybe that could indicate the system is low on freon and then the pressure concept might be right on. What about the ac switch that is there on the ac freon system up front on the drivers side right in front of the ABS controls...could that ac switch be going bad? I think I might have teh ac seviced and try the pressure concept first.
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red