Car Noise

[piroska]

It recently (2 weeks ago) had a service.
Relevant or not...I don't know.

Anyway last couple of days when I first start - while car is cold - there's a hissy noise.....it goes away once car is warm. Like the sound a frying pan makes when you drop the steak in.

What is it? No dash lights on, no difference in the way it drives or anything.

[allblack]

All I can think of is thermostat, and air pressure. And when the thermostat opens when the car heats up, it releases the pressure that was causing this hissing sound.

I know that's no help.

[piroska]

Thanks, I've since found out it's the alternator belt.
Booked in for a new one....

[allblack]

Ooooh...well I was close.

[zqwerty]

Hmmm, slipping whilst cold causing hissing sound, stops slipping and becomes more "grippy" as it heats up, I'd be looking to adjust fanbelt/alternator pulley tension as a first step, but if there are obvious signs of wear then replace of course.