Date registered: Mar 2005
Vehicle: 1988 300E, 2006 E350 wagon
Location: Philadelphia, PA
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
normal engine temperature? - m103
I changed my thermostat this past weekend because the old one had failed. At least it failed in the open position, which in my mind is better than the alternative. But it has meant that lately the heat hasn't been as strong, and I'm sure the gas mileage suffered from the low engine temps - I was getting about 20 mpg mixed driving. I haven't had a chance to track any change in mpg since.
The new thermostat is rated for 87 degrees C.
Now the engine temp comes up quickly as it should (whereas before it wouldn't get above 60 degrees C), and sits right at what I would guess is 85. If I'm driving in the city and then sit at a long light the needle will creep up to 90 (ambient outdoor temp today was something like 40 degrees F or 4 degrees C).
I just want to confirm that this is normal. Or is it a little high?
I seem to recall that before the last thermostat failed it hovered around 80. But maybe that's because it was on its way out ...
When I went to add coolant back to the system I also noticed that the rubber gasket on the reservoir cap was crumbling. I intend to replace it soon so that I don't get little bits into the cooling system. Could it be that the cap is leaking pressure, and that in turn would cause the temperature to swing up a little?
Thanks for your feedback.
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2006 MB E350 wagon
1988 MB 300E
1997 Volvo 854 -- RIP
1992 Saab 900s Turbo -- RIP
1988 Saab 900s -- RIP
1987 Volvo 245 -- RIP
2000 Aprilia Pegaso 650 -- sold