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318ti808 · 11-17-2011, 10:34 AM

I had similar issue with the temp gauge. Mine was a broken thermostat housing. The plastic housing portion inside the housing (motor side) that holds the thermostat was broke so the thermostat was constantly open. When driving at a constant speed say on the freeway the temp gauge would run at 1/3. Sitting at idle the car would jump up to a more normal around 1/2.

11-17-2011, 10:34 AM	#11
318ti808 Junior Member Join Date: Jan 2010 Location: Honolulu, HI Posts: 25 iTrader: (0) Photo Gallery	Temp issues I had similar issue with the temp gauge. Mine was a broken thermostat housing. The plastic housing portion inside the housing (motor side) that holds the thermostat was broke so the thermostat was constantly open. When driving at a constant speed say on the freeway the temp gauge would run at 1/3. Sitting at idle the car would jump up to a more normal around 1/2.