whining noise after A.C. is on

[Hany Saad]

Hello all,

Mine is an 06 Megane 1.6 petrol engine with 20K on the clock,I did not use my a.c. for the last 8 months or so (winter time in Egypt),lately when using the a.c. for long journeys(2hours or more) and then switching it off,I start hearing a whining noise with a regular pitch during motion on all speeds,it is not related to the brakes nor to the wheels its coming from something rotating with the motor,it becomes louder when I shift to normal during motion.

Next day the sound is gone and so on after the a.c. is on for like 2 hours or so and then I turn it off I start hearing the sound,if I do not use my a.c. or use it for short periods, no sound is heard,

any help will be highly appreciated.

[terry_mccann]

best bet is that your refigerant level has decreased and has to be filled up.

be advised, not using the AC for 8 months is not good at all, everythings drying up inside the AC-system and thus the gaskets are getting damaged over the years....use it once a week for some minutes to avoid this

[cactusbob]

Don't understand why you hear it after the aircon is turned off. But yes get it regassed (they put oil in too) and see if it fixes your problem