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Old 12-23-2011, 06:31 AM   #13
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Join Date: Aug 2006
Location: NJ
Posts: 23,709
My Ride: '99 328i 300K miles
Originally Posted by Andy2108 View Post
Air intake temp of 137.3C

Do you have any codes?
Nice, Andy! Good catch!

OP, are you getting a weird outside temperature reading? I know there's an intake air temp sensor hiding in the manifold, think around the 2nd cylinder, but there's also an outside air temp sensor hiding under the front bumper. I'm not sure whether the car gets temp from only one of them or not, but that air temp seems too high, and I know that when the 'ambient air temp sensor' goes bad, it registers crazy outside temp readings. If that's bad, that might be another reason why your heater valve won't open...the car thinks it's really hot outside and is trying to protect you!

Check out the sensor and/or wires/connections.
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