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An easy way to test...
Get a meat thermometer and stick in the center vent.
While driving around town at engine 1500-2000 rpm, the center vent should read 150F-160F or so, or it should be "uncormfortably hot" to your hand.
Make sure:
1. You turn the heat all the way up
2. Blower motor at 30-40% speed
3. ONLY center vent is selected (and the center air selecter is turned all the way to RED).
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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
Last edited by cn90; 10-30-2023 at 12:40 AM.
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