I'm wondering what the operating temp of the S320 should be. Tonight I was driving home, and the outside temp sensor was readying 16C, and the water temp gauge was reading almost 100. I had no AC on. I also couldn't get the car to cool down in traffic today w/o the AC on. It was running around the 110c mark or higher.
How does one check a rad for cold spots??
I replaced the h2o pump and tstat 2 years ago, but how does one check for coolant flow??
Fan clutch was replaced recently....

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'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic