Hello, How long does it take to reach 80 degree at sub-zero temperature for a 400E? The temperature now in my area (Canada) is about 3-4 Celsius, everyday I drive about 10 km to work, I don't warm up my car first, it takes nearly the whole trip to reach 80(15 minutes), is this normal? or I have to get a new thermostat? My other cars reach normal temperature at 1/3 of the trips (5 minutes). Thanks

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99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.

Probably do need a new thermostat. Mine usually gets up to 80 after about 3-4 miles. I replaced mine last year when it just would not ever quite get to 80.

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Steve
'93 400E

Thermostat is probably partially stuck open.

This is way too long for it to warm up, definitely replace the thermostat.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record

Thank you, guys.

I will replace the thermostat this weekend, maybe I can also improve my gas mileage by doing that.

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99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.

The thermostat was getting worse, not only it took quite long time to reach 80, but also after it reached 80, it went all the way to 110, I had to turn on heater to cool the engine.

Ordered a 80 C thermostat from Partshop, but just couldn't wait for a week.

Yesterday I took out the old thermostat, and brought it to local Canadian Tire store, I was very lucky to find a one with the same diameter, the gasket fits perfectly. It's a MotorRad brand high flow thermostat, only difference is that it's 192 F (90 C), and it cost only 22 Canadian$ (14 USD).

Now the engine warms up super fast, and the needle stays one line above 80 degree, I guess it should be 90 C.

Can I use this 90 C thomerstat for this whole winter and use the OEM 80 C when it gets warm? An extra 10 degree makes me feel warmer in Canadian winter, I hope this M119 engine is not very sensitive to coolant temperature.

BTW, the original thermostat from the car was very bad, I easily pulled out the center push rod by my hand.


Thanks.

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99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.