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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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  #1  
Old 08-08-2014, 04:17 PM
AV8R4AA AV8R4AA is offline
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Location: Dallas
 
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Mein Auto: 86 635,87 M6,2000 528it
Is there a "punch it" switch?

I am asking this because I think my car does this.
If I have to "Punch it" and the car downshifts to lower gear to pass someone.
Does the AC shut off to assist the engine for max power?
I remember older cars did that and I am asking if our modern cars are the same.

Seems like when I let off the gas pedal, the AC seems to blow colder air.
The fan and AC all work fine just asking if the compressor shuts off during
heavy accelerating.
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  #2  
Old 08-08-2014, 05:23 PM
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matt540 matt540 is offline
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Mein Auto: DINAN 540
Ive never noticed if the A/C compresssor shuts off because I never have the A/C on. I wouldnt see why it would shut off, because it only makes the transmission shift to a lower gear bringing the rpm farther into the power band. Its a its a good question, you should try it and report back to us what happens.

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Old 08-08-2014, 07:43 PM
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crowz crowz is online now
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Mein Auto: 2000 323i, 97 528i
Full acceleration at low speeds - below 10mph with a full throttle input will cause the compressor to shut off for 10 seconds.
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  #4  
Old 08-08-2014, 08:16 PM
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QSilver7 QSilver7 is offline
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Mein Auto: 1997 740iL / 2006 X5 4.4
Quote:
Originally Posted by crowz View Post
Full acceleration at low speeds - below 10mph with a full throttle input will cause the compressor to shut off for 10 seconds.
DITTO

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2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
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99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

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