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Administrator, Resident Tater Salad
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The serpentine tensioners are a known issue on the 1.4L motors that can make a chirping sound.

However, a simple test...remove the dipstick 1/2" while at idle with AC on and see if that makes it stop. Don't remove it enough to the point where the car almost stalls, but if the sound goes away, it is a PCV issue - likely the sound you hear is coming from the crankshaft seal, and you should start by verifying the PCV check valve is present in the intake manifold.
 
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