infamous pegged to the right temperature gauge. it is your thermostats/housing fail to open/close. buy thermostats from autohausaz.com for $60 and have a mechanic replace it for $150 most. but while you are at it check for leak in water pump. here is the trick everyone here has been doing when you have that happens. your temp. gauge pegged to the right after 5 mins of start/drive at cold/extreme cold temp. just turn off the car and restart it. it will release the pressure build up and make your thermostats open/close normally, you will get heat coming out normally too. but after you have let the car sit for more than 1 hour outside and it is cold it will happen again. good luck.

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2002 X5 3.0 Siena Red
Premium, Cold Weather, Rear Climate Packages, 19" Wheels
Aluminum Running Boards, Clear Tail Lights, Clear Side Markers
Titanium Kidney Grills, Titanium Trunk Lid, Xenon Headlights
4.6is X5 exhausts, 35% Tint, Aluminum Pedals
2005 530I Mystic Blue
Premium Package, Sport Package, Xenon Headlights
18" Sport Wheels, 35% Tint all around
Mods to come: M-Tech Front Bumper, M5 Side Skirts, M5 Rear Bumper
Quad Exhausts, Style 172 19" Wheels