Technical Grande punto weird hybrid like noise

[kmk]

Hi all,

I have a 2007 Fiat Grande Punto (1.4 petrol), and recently I’ve noticed a strange electric or hybrid-like sound when accelerating – but only when the air conditioning is on.

The sound is most noticeable in 1st and 2nd gear during light or moderate acceleration.

It sounds a bit like a high-pitched whirring or humming, almost like an EV.

As soon as I turn the A/C off, the sound disappears completely.

The A/C still cools fine, and there are no warning lights or performance issues.

I also noticed clear water dripping from under the car, near the exhaust and center section. From what I’ve found, that’s likely just normal A/C condensation, so I’m not too worried about that.

 

[ZaphodB]

I have a 2007 Fiat Grande Punto (1.4 petrol), and recently I’ve noticed a strange electric or hybrid-like sound when accelerating – but only when the air conditioning is on.

The sound is most noticeable in 1st and 2nd gear during light or moderate acceleration.

It sounds a bit like a high-pitched whirring or humming, almost like an EV.

and it goes up in tone/frequency as you accelerate ?

Likely the belt is my first thought, can you replicate it by having someone raise the revs whilst stationary , and you listen inside the engine compartment?

If it is a wearing belt, you could try dribbling a tiny amount of water on it continuously and see if noise quietens.

I also noticed clear water dripping from under the car, near the exhaust and center section. From what I’ve found, that’s likely just normal A/C condensation, so I’m not too worried about that.

That is indeed normal for an aircon system