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Thermostat is definitely stuck open. Have the thermostat but am short on time. I've ran a handful of searches to figure out what all is involved. Found one guy who said it took his shop 10 minutes and one who said the entire front of the engine had to come off. Does anyone know of a DIY? If it takes a shop 10 minutes, it'll take me an hour. If the whole front of engine has to come off, who knows. Thoughts?
It's straight forward. Mine was stuck open as well.
1. Remove front engine cover that has Mercedes emblem
2. Disconnected the two rubber hoses that go around the power steering reservoir.
3. Unbolt power steering reservoir and move to the side.
4. Remove both coolant hoses that connect, there's just a clip that needs to be pulled and the hoses wiggle off.
5. Then remove and re-install the new thermostat.
I did mine with no DIY. Once you remove the power steering reservoir you'll figure it out. There's no surprises on this job.
It's straight forward. Mine was stuck open as well.
1. Remove front engine cover that has Mercedes emblem
2. Disconnected the two rubber hoses that go around the power steering reservoir.
3. Unbolt power steering reservoir and move to the side.
4. Remove both coolant hoses that connect, there's just a clip that needs to be pulled and the hoses wiggle off.
5. Then remove and re-install the new thermostat.
I did mine with no DIY. Once you remove the power steering reservoir you'll figure it out. There's no surprises on this job.
Where is the engine coolant tempurature sensor on these cars?
It's straight forward. Mine was stuck open as well.
1. Remove front engine cover that has Mercedes emblem
2. Disconnected the two rubber hoses that go around the power steering reservoir.
3. Unbolt power steering reservoir and move to the side.
4. Remove both coolant hoses that connect, there's just a clip that needs to be pulled and the hoses wiggle off.
5. Then remove and re-install the new thermostat.
I did mine with no DIY. Once you remove the power steering reservoir you'll figure it out. There's no surprises on this job.
im stuck on #3. lool. i only saw 1 screw...which i loosened. there another you could point me to?
Possibly why the dash reading is different than the OBDII reading? All the temps below are recorded at roughly the same time. The upper rad hose temp was more inline with the dash temp. The expansion tank eventually caught up with the rad hose temp the longer I let it idle.
I would notice as it idled longer the rad fan would kick on slow speed and the OBDII coolant temp would fluctuate around the 96C mark with the dash temp stable at 92C. Possibly time for a new thermostat.
Confirmed the t-stat sensor is for the dash (unless there's another one somewhere else). That sensor up higher must be what OBDII reports for coolant temp. When it's unplugged the rad fan comes on full beans. Probably threw a code as well I will check what OBDII says with it unplugged tomorrow.
01-30-2019, 12:01 PM
