I believe that your alternator may need to be bench tested - when your a/c comperssor turns on (when your a/c turns on) this is a larger draw of required volts for your car, and therefore a larger load on your alternator. I believe that an alternator "struggling" to keep up with "demand" can cause the alternator belt to squeak. It could also be something as simple as a belt slippage - there is extra tension on the belt when another accessory is being used (your a/c). Check the condition of your belt. Think of paint finishes for a moment. If your belt has any "shiny" or "glossy" (called glazed) appearance, or has any cracks in it, then simply erplacing your belt could solve this. But if your belt is in good shape (has a dull or "matte" appearance), then have your alternator bench tested at a reputable auto parts store/mechanic. Another test you could do on your own is to start your car, then while it is running, disconnect the positive lead from your battery. If your alternator is running well, it should easily run your car on it's own w/out the battery. If your car stops running after disconnecting your battery, then your alternator is absolutely the culprit, and needs to be replaced. I am not a mechanic, but these are a few simple checks you can try yourself - good luck!
Belt or A/C clutchTwo other possibilities:1. Most likely -- The belt is wearing out, getting loose, etc. Check the belt for glazing (makes it look shiny). Check also the strength of the belt tensioner.. (Take the key out of the car for this check!!) If you can pull the belt more than an inch toward you, the belt and / or tensioner may be bad.
2. The A/C compressor clutch is wearing out. This is not as likely. This would have to be repaired by a professional.
replace alternator belt
belt
if it was like my 99, then a belt was worn out, and will cause a chirping noise, if it is in the engine compartment, it is very likely to be a belt
I need to know more, what model, what engine? It could be a belt, could be a pulley, could be a cam synchronizer.
If the chirping noise speeds up as the truck speeds up, check the u-joints in the drive line.
When Exhaust brake is on squeak noise comes from the engine?"
If your 2002 Ford Sport Trac is making a chirping noise when you do a cold start up, this could mean that you have a problem with the engine. You should have it looked at by a mechanic.
Servicing required.....
A chirping whistling noise!
The noise is birds chirping.
Noise coming from engine in Oldsmobile Cutlass could be as a result of an oil leak in the rear of your engine. This makes the gears to wear off leading to severe knocking noise.
They make a short chirping noise (only the females make this noise)