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a/c system squeal when first turned on

Discussion in 'Car Discussion' started by 757-200, May 6, 2017.

  1. Hi, I had the air con in my signum re-gassed the other day and now that its working nice and cold I have been using it the past few days with it being a tad warmer, I have noticed that sometimes (not every time) that when the a/c pump first kicks in there a squeal from under the bonnet, apart from that it works fine, any ideas ?

  2. You'll probably find that the noise is coming from the bearing on the pulley of the A/C compressor. When you turn the A/C on, the compressor engages and the auxiliary belt turns the pulley. If the A/C has not been run for quite a while this is likely to contribute to the noise - also maybe worth checking the belt for any cracks.
  3. I dont think it had been used much before my ownership tbh...there was gas in the system but cold air was poor. Cheers