SOURCE: squealing NOISE possibly from fan belt
Belts stretch from new. Try to tighten them again. Hopefully the are not glazed or this may stay with you.
SOURCE: Check engine light/gas cap will not stay tight.
yes the gas cap could cause this,also check evap. purge solenoid and hoses for cracks or kinks,the solenoid is on the inner fender and has 2 hoses, one to the intake and one to the canister, the most common cause of this code is a defective purge solenoid.
SOURCE: squealing noise coming from the belts while engine is running
take off your serp-belt and spin your water pump, alternator, idler pully and see what squeaks or feels rough. your water pump bearings may be bad. the only thing you can do is change it. dont forget to change your thermostat and antifreeze. FYI your antifreeze is made with lubricants in it for your water pump bearings.
Sounds like the new alternator was run without first fully charging the battery (12.3 - 12.8 volts)
This will destroy an alternator every time -- the classic symptom is a squealing belt.
SOURCE: I have a high pitched noise which appears to be
Could be several things. WHICH ENGINE?.. 4 cylinder (has three belts, power steering/water pump, alternator & A/C compressor, one tensioner pully A/C compressor), The V6 2.7 (has only one belt, 1 Idler pully and 1 tensioner pully), the V6 3.5 has two belts - A/C/alternator, and power steering - there are two tensioner pullys). Noises can be caused by the belt(s) themselves, pullys, bearings, pully bearings, water pump shaft bearings (or belts/pullys rubbing up against something). Let's not forget that there is also belt(s) behind the Timing Belt cover as well as pullys and bearings associated with the timing system. You could start by removing one accy drive belt at a time (alternator, water pump, compressor, power steering, etc) to see whether or not the noise goes away in each case. If after each case, you discover the noise is still there, it's probably behind the timing belt cover (idler/tensioner pully, water pump shaft bearing, crankshaft bearing, etc.). Good Luck
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