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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > RPM surge with AC on
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      06-15-2020, 04:43 PM   #1
gzN26
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RPM surge with AC on

Hey guys, now that summer is upon us my AC is getting a real workout in these days. Today I parked my car at work and turned up the AC all the way for a few minutes. After a few seconds, my RPMs surged from 650-700 all the way to 1200 for a few seconds then dipped back down to normal. This continued to happen a few times over the next 2 minutes.

I did notice a constant sound from the blower motor, almost as if something was stuck inside.

RPMs only surge when AC is close to full blast and in park/idle.

I turned off re-circulation mode and it didnt seem to surge as much.

Has anyone experienced this issue?

Belts, Throttle Body, Vacuum lines all look good.
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      06-15-2020, 06:58 PM   #2
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      06-15-2020, 08:44 PM   #3
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