On hot days, or even not so hot days, the car will go to 100C. On really hot days 95F it will reach 110C. No higher so far. Not at all familiar with the cooling sys on this car (1995 E320 Wag) The coolant was the green stuff when bought and we changed it to MB Orange. No problems all winter, no overheat, great heat. Called MB about overheating prob and they said bring it in, way too complicated to do anything. Would like to fix myself. Appears to have new waterpump and radiator, thermostat new 2003. Here is what I have observed so far. After running for a few minutes the upper rad. hose is hot, lower one is not. The short one to the engine from pump is also hot. When temp hits about 90C, the lower hose gets hot. The twin elec fans seem to run slow all the time when the AC is on. Unplugging the 4-prong plug on the WP makes the fans run max. Sometimes turing on the heat makes temp drop almost 10-15C. Sometimes water level rises almost an inch in the tank when hot. Last night on a drive with outside temp 70F in no traffic the temp was at nearly 100C at a redlight. Cooled off when driven 35mph. Our Volvo temp guage goes to the middle and stays there. The MB guage is always moving around, making you nervous. Need help. Whats normal, what are some things to check. Recently I took a bunch of hoses off and reflushed all the coolant out to make sure no blockage. After that, I started seeing a little water on the driveway under pass fenderwell. Not alot, perfectly clear, and smells like water, not antifreeze. Where does the AC drain, by the way? Please help, will check back tomm morning. Thanks.
Oh by the way, what about the monovalave? When the heat is on, you can feel the aux WP on. How do you check the monovalve? With CC off, cooling hoses which go under batt box are cold, when on, they get hot. Should they always be hot?

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro