My '95 Integra LS makes (just noticed today) a strange noise when I shut off the engine.

It sounds like a squawk that last for ~1sec right after I turnoff the ignition. I started the car again, opened the hood and reached in through the window to shut off ignition again. This time I hear the squawk followed by a hissing noise that lasts ~2sec. Everything else seems to be running OK.

I don't know to describe the squawking...I'd imaging a slipping belt type of noise but not high pitched.

p.s.
I don't have A/C or ABS, if that matters.

Thanks