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Model: BMW328 xi. 2008 I just installed a new alternator yesterday and now my car is throwing a temperature light and the rpms fluctuates when in idol. Almost like someones tapping the gas pedal. I went to a local independent shop and the mechanics saind it may be a throttle sensor? They also...

1998 528i began overheating again after a year of no problems. This time temperature wants to go up an stay up. Heater blows warm on driver side, but not hot. Heater blows luke warm on passenger side. Cooling system overhaul was done approx 15k miles ago. Coolant level is perfect. I replaced the...