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#1
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at trafflic lights, i can hear some motor kick in and my lights dim. what is this?
once a while when i'm stopped at a traffic light, i can feel/hear some motor kick in for a few seconds and then it stops. when the motor kicks in, my dash cluster lights dim for a split second too.
what is this motor and what does it do? it must be drawing lots of current to dim the cluster lights
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Current cars: 2001 MB E55 AMG 2003 Honda S2000 2000 Honda CRV Gone but not forgotten: 2004 BMW 325i 5sp sport 1999 BMW 540i sport 1997 MB E420 1995 BMW M3 coupe |
#2
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Can you tell where the motor noise is coming from?
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#3
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Answer:
Normal operation.
This is your electric auxiliary cooling fan turning on. Have a great day.
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
#4
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It's probably the secondary air injection pump. Some people say it sounds like a vacuum cleaner. Is it a really high-pitched whine?
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#5
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Hmmm
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I only had one bad enough to dim the lights, and it shorted seven days later. |
#6
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Quote:
yes, sorta sounds like a high pitched whine. is that bad?
__________________
Current cars: 2001 MB E55 AMG 2003 Honda S2000 2000 Honda CRV Gone but not forgotten: 2004 BMW 325i 5sp sport 1999 BMW 540i sport 1997 MB E420 1995 BMW M3 coupe |
#7
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Quote:
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