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Old 12-03-2012, 08:27 PM
Robz_745 Robz_745 is offline
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Location: South-Eastern Ontario
 
Join Date: Oct 2011
Posts: 46
Mein Auto: 2004 745li
Glad you posted. After I did my coolant pipe last winter, I monitored the temp @ between 100 and 105C. Just last week I got a CEL and P0128 code that indicates the engine is running too cold / too long so I monitored the temp on my drive home from work (about 30 miles 50/50 hwy/cty). It warmed up to 90C and stayed there cruising @70mph on the freeway. When I got into some lights, it only got up to 92.
I picked up a new thermostat but didn't get a chance to install it last weekend so going to have to wait till this coming weekend. Hopefully that fixes the problem; I figure the thermostat is stuck closed or has a leak.

I think 105 is probably the normal temp. I thought I saw that when reading through some similar posts.
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