I bought this 2004 cruiser has done this from about the2nd or third year after purchase new,only when in wet conditions it makes this chirping noise fall,winter or even after a car wash in the summer,

my guess is your water pump is not working properly and the loud chirping sound is from the serpentine belt which also runs the water pump, alternator, ac and steering pump. first thing to check is coolant the cooling fan , thermostat , water pump in this order. chirping sound definitely come from the belt but the cause could come from any of the driven part but im zeroing in on the water pump because the car is running hot. old belt could also cause the chirping.

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I had same problem...Clean thottle body...Take hose from air cleaner off,two silver clamp...Take cover off throttle cable,open butterfly,wet cloth with carb cleaner,Wipe inn side,clean soot out...Done....I have 2004 PT 26000 all city miles

Hello, There are several things which can do this. First, cut off the A/C and then rev the engine as before. If the chirping goes away, the noise was either the A/C clutch or the Serpetine belt slipping with the load. For the A/C clutch, you can try a little rust removal between the drive plate and the pulley with the engine OFF. You can use sandpaper and try to knock off the rust. Then put a little oil on to condition the metal. Then try it with the A/C on.

If the chirp is still there, you have to check bearings on the Pulley tensioner, Alternator, Water pump, and Power steering. It is possible for the Pulley tensioner to have a weak spring or you may have a stretched Serpetine belt. This condition would cause the belt to skip under a load. If the belt is checked with small cracks, just replace the belt. Take off the tensioner and compare the spring tension and wobble in the pulley to a new unit at the Autoparts store.

If still no success, the chirp could be a water pump bearing. The old way off using a piece of wood on the housing of a part while the engine is running is dangerous, but effective. I believe you should have already found your problem before this measure is needed. Dry Serpetine belts make quite a lot of noise and is probably your problem.

I hope my Solution is very helpful to you.

Could be any of the componets that are making the noise, one of the most common is the altenator trying to charge a weak battery [ the altenator goes into highest charge mode causeing the belt to slip a little. have the battery checked.

When the belts age they dryrot like tires, Twist the belt upside down and bend slightly, You will likely see cracks, Just replace the belt and you should be good to go

When the car was built they did not have the chirpping option. I had owned a 95 & a 96 both purchased new and that chip you will not here from a factory unit. Maybe aftermarket has that option if you know someone with the chipping noise in their Caddy. I also worked at a Caddy dealership for 7 years and never heard one chirp in any 90's model

drive belt chirp check adjustments off belts and alignmment as well as condition of drive belt and any accessory belts

Certain brands (cheapo) of serpentine belt will do this. It is because the new belt is thinner than the old belt. This causes reduced spring tension by the belt tensioning device. Other possible problems are a bad belt tensioner, driving through deep water and getting the belt wet while driving or a defective crankshaft harmonic balancer assembly.
I HATE Dayco brand belts, because they do this a lot. I would have the shop inspect the parts mentioned above. If they are OK, tell them you want a new belt (for free).
Charlie

sounds like the bearing in the hub assembly has gone bad