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BMW 3-Series (E90 E92) Forum
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When I turn on heater, slight vibration and idle change.
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| 10-17-2013, 09:10 PM | #1 |
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When I turn on heater, slight vibration and idle change.
Is it normal that when I turn on the heater even when it's just floor vent for the idle to go up slightly and a slight vibration? I have change in the tray and it makes no noise until the heater is on. Any thoughts on why this happens?
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| 10-17-2013, 09:14 PM | #2 |
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BMW Über Alles
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Not sure about the heater (am in FL ☀️) but the AC does it on my current car and my last. It's normal IMO unless you get any warning lights or something...
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| 10-18-2013, 01:07 AM | #3 | |
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Quote:
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| 10-18-2013, 01:53 AM | #5 |
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The AC compressor is on a belt connected to the motor. When it turns on it unset the idle for a short period.
If the idle remains rough with AC on, then you may want to look at the condition of your accessory belt and pulleys. |
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