Ghooooon ghooooon
where : From the front, under bonnet
When: Mid-high revvs, sound is less when AC is on
Problem : AC compressor bearing is toast
Urgency : Get it fixed at the next service
Fix : Replacement of compressor bearings and compressor overhaul. Takes two days sometimes as the compressor is sent to Subros etc., Cost close to 6-8K even in economical cars.
Chidchidchidchid
where : From the front, under bonnet
When : Cold/humid starts
Problem : Belt is loose
Urgency : NADA
Fix : Belt tightning
taptaptaptaptap or karkarkarkarkar
When : idling
Problem : tappet noise
Urgency : medium
Fix : Tappet adjustment or replacement depending upon what gives.
hope this helps (Note : These are from personal expiriences)
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