94 C280 Overheating
here's my .02
on all of my cars the top radiator hose leads to a neck in the engine block. the thermostat is under that neck, it should have a few bolts around the rim of the neck. drain the coolant from the radiator into a pan and keep it away from the dogs and inlaws, if you like your inlaws, and yank that sucker off, remove hoses, wires and assorted paraphanelia that are attached to the neck first, get the bolts out, and you may have to use a rubber hammer to get the old gasket to break loose, clean everything up super good, put the new thermostat in, make real sure its in the right direction, stick everything back together, leave the cap off the radiator fill with coolant, start the car flip on the heater, and watch for the air to purge out of the radiator, keep an eye on the temp guage, should just take a few minutes. ad the rest of the coolant, cap the radiator. if it's not your water pump, your all set.



