RPM increasing when closing AC

FancyTie · 09-23-2020, 06:51 PM

Car’s idling at 500r then if I close it it goes to 1000rpm then goes back to 500rpm..
Is this normal? I’ve seen that it’s due to more « load » on the car! Is it true?

Thanks!!

Eschmacher · 09-23-2020, 08:05 PM

If you turn on AC, there is more load on the engine because the AC compressor is driven by the accessory belt.

Sometimes when turning the AC off, the idle rises a bit because it no longer has to work as hard to maintain steady idle. It then settles back to normal idle RPM.

09-23-2020, 06:51 PM	#1
FancyTie Private 5 Rep 86 Posts Drives: 2013 335i M Package 6spd Join Date: Jul 2020 Location: LA iTrader: (0)	RPM increasing when closing AC Car’s idling at 500r then if I close it it goes to 1000rpm then goes back to 500rpm.. Is this normal? I’ve seen that it’s due to more « load » on the car! Is it true? Thanks!!
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09-23-2020, 08:05 PM	#2
Eschmacher Car Hypochondriac 335 Rep 903 Posts Drives: 2014 335i M-Sport Estoril Blue Join Date: Feb 2017 Location: Sterling, VA iTrader: (0) Garage List 2014 BMW 335i [0.00]	If you turn on AC, there is more load on the engine because the AC compressor is driven by the accessory belt. Sometimes when turning the AC off, the idle rises a bit because it no longer has to work as hard to maintain steady idle. It then settles back to normal idle RPM. __________________ Power mods: VRSF IC/Catted DP - FTP CP/BP - AFE Cat-back - BM3/XHP - Dorch S2 Handling mods: Koni yellow - Eibach prokit - Millway street - M Performance LSD - M3 brakes - EBC bluestuff Exterior: Euro LCI tail lights - Shitty ECS CF spoiler - Chinese M performance diffuser Interior: Bavsound stage 1 and subs - custom trunk sub by Mike1327
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