Rear pump/compressor noise "normal?"
#1
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Rear pump/compressor noise "normal?"
I'm trying to figure out if a pump/compressor noise coming from the rear of my new (to me) 04AR is "normal" or not. Under regular driving conditions, at all height levels, and with ESP on or off, I hear it kick on and stay on at ~30mph and turn off at ~15mph, as when coming up to a stop sign. It does NOT run when car is idling, or after I shut off ignition (which I have read about in other posts). Noise is a sustained buzz that I can hear just above engine noise up to about 45mph, when it becomes masked. Whadayathink? Suspension/air pump, fuel pump, ABS pump? Bad? Indicator of something going out? Normal? Thanks in advance.
#2
It usually does come on as you stop just due to weight redistribution...
So most likely normal. It shouldn't be on continuously though, but for a minute or so is fine.
Once it starts to fail it gets really loud (from outside) and sounds almost like the air compressors at the gas stations. I should know, mine started doing this last night.
Once it starts to fail it gets really loud (from outside) and sounds almost like the air compressors at the gas stations. I should know, mine started doing this last night.
#5
here is your test..
while at idle, go down to L1 and after it settles go all the way up to L4.
You are doing this to drain the storage tank and signal the compressor to go on. Once it goes on ask youself if its the same noise you have been hearing.
If it is..something is wrong as the compressor should never cylcle on that much.
You are doing this to drain the storage tank and signal the compressor to go on. Once it goes on ask youself if its the same noise you have been hearing.
If it is..something is wrong as the compressor should never cylcle on that much.
#6
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May be same sound, but...
Performed your test. I drive the car in Level 1 all of the time and wonder why the rear compressor would be turning on and off like clockwork at speeds indicated in my first post. Front end is quiet as anything. Is this indicative of a leaky rear airbag? Other sources of sound? Thanks, Paulroad.