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Air con makes car rattle

Brian L Jun 18, 2017 at 10:50 AM

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  1. Brian L

    Brian L New Member I am in uk

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    Next thing to sort out is a rattle from the exhaust that happens when the air con is on, the air con pump turns off and on when switched on, there is a slight rattle from the pump like the bearing is going but anyone any ideas why the engine starts to vibrate more causing the exhaust to go psycho, does the air con need regassed or the the pump replaced?

    Any ideas much appreciated
     
  2. Ben Stratford

    Ben Stratford Well-Known Member I am in england

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    Perhaps the rpm's drop slightly when turned on causing an increase in vibration due to resonance or something?
     
  3. clivehorridge

    clivehorridge Well-Known Member Supporter Guru I am in romania

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    I have (and I think most will have) on the 80 series, an idle-up so that as the pump kicks in, the revs will be lifted a 100 rpm or so to compensate for the extra load.

    Presuming this only happens when idling, not when you're driving?
     
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