for you 603 guys out there...

[jack.stew48]

hello all,
so far i have worked exclusively on the om617 and 616, but i recently bought a 1987 300sdl for a very fair price. its been sitting for a few years and has an exhaust gas into coolant leak (i used a coolant tester and it showed co2 in the coolant)

the issue i have run into is it overheats. as soon as i start it, it heats up and keeps going until i turn it off at 100 degrees. ive used a infrared thermometer to determine that there is significant heat at the top radiator hose, and no heat at the bottom hose. i checked the thermostat and found that there is no thermostat in it currently.

i know about the fan clutch and have determined that it needs to be replaced, but i figure i will get to that after i get the rest of the cooling buttoned up.

next i plan to check that the radiator isnt blocked, then go after the water pump.. anything im missing?

thanks in advance, Jack