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Old 01-09-2013, 09:38 AM   #37
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Join Date: Apr 2012
Location: New Bern, NC
Posts: 973
My Ride: '04 Cadillac Deville
Originally Posted by WDE46 View Post
I just replaced my thermostat. I went from having a low of 66C on the highway at 80mph in 30F weather, to holding 95C in as low as 20F weather (I'm sure it will hold to even lower temps). Your operating temperature specs are most definitely correct.

As far as how long it takes to heat up, my car is in the center within 5-10 minutes of driving.

The low boundary on the buffered temperature needle is about 75C. If the needle is not DEAD center, then you have an issue. You could even have an issue if it is dead center, but if it's off at all, you DEFINITELY have a bad thermostat.

I also need to add that I had no error codes for a stuck or malfunctioning thermostat. I ran the car at that temperature 66C-75C on the highway for a month or two in 40 minute intervals. The error never appeared.
Just to add something really quick... my car runs at 95F all day long and the temp gauge sits slightly to the right. Maybe 1mm or less. This seems to be common on E46's I have seen on the internet. No problems here, just wanted to add that so you don't freak people out who are less well versed on these cars.
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