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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 02-01-2013, 01:48 PM
chuckjim chuckjim is offline
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Location: wa
Join Date: Jan 2013
Posts: 8
Mein Auto: 2000 528i
cold air on auto when t-stat set warm

I have a 2000 528i with 140k not so cared for miles. I have an ac/heat issue. When car is warmed up I set dual thermostats at 72 degrees and if i have selector switch on floor and vent settings, all is good. Thermostat regulates heat output and keeps everything good. My problem starts when I switch selector switch to auto. I only get cold air out vents an floor duct closes but you can tell heat is trying to get out but it cant. As soon as I switch from auto setting to floor or vent setting warm air begins to flow out these vents. Any ideas?
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