Date registered: Apr 2006
Vehicle: 1992 190E sportline, 1993 300ce, 1993 300ce sportline, 1992 300sl
Mentioned: 0 Post(s)
Quoted: 10 Post(s)
when is hot too hot?
Since it is summer (as always) in south Florida, 90+ temp and high humidity, my 1992 300sl seems to be running way too warm. It reads 100 - 105 on the temp indicator almost all the time. That is in traffic, on the highway at 70+ steady state, and just cruising around. This is with the ac on, somewhat lower when it is off.
So far I have replaced the thermostat with an 80 degree one down from 87 degree, new coolant, new fan clutch, no leaks or coolant use. Condenser and radiator are clean and no external blockage. Using my IR thermometer the temp is @ 205-215 at thermostat housing, 200 at top radiator hose and I am seeing @ 10 degree temp drop from bottom hose to top hose (should I see more temp drop than this?))
Compression and vacuum is strong and it runs well after having the EHA tuned properly (thanks Pierre). He says it should be running much cooler - but most have said that these temps are normal and not to worry. Both AC fans run as necessary and it does not seem to rise over @110, but there has to be a reason for it to run so hot even when it is 80 degrees outside in early morning drive.
Is there any way to really check the radiator to see if it is clogged or obstructed or just change it out and hope for the best? It looks to be very clean and not sure if it has been change since the car was new. Is this the best option to replace the radiator as all else is new or working properly? What other things should I check?