Hi fellas, I have an '85 300SD which i love. Problem is, after driving, especially with the air on, after i shut off the car, steam and coolant come out of the overflow tube. Have a relatively new radiator, new factory stat, new coolant resevoir, water pump and hoses in good shape. Temp guage rides right around 80 even on hot days, with the air on, and temp sending unit is good. Aux fan works. yet every morning I have to add anywhere from 1/2 to 1 gallon of coolant because it boils it out after i shut the car off. Doesn't do it nearly as much when i don't use the air. But the thing that frustrates me is that the temp guage never goes high unless it's low on coolant. Other that that, it starts and runs like a charm, with 291 well cared for miles. Doesnt even leak oil, if you can believe that. HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!