The stereo in our 2002 Chevy Malibu has power but has intermittent sound loss, The stereo loses sound for random lengths of time. how do i solve this problem?

limited info generic reason you changed all those parts --was it overheating --check and test relays and fuel pump --

New radio

Check with the auto parts store to see what the fuel sensor looks like, It should be accessible and I have seen those go on the smaller chevys like aveo.
Look up on internet replacing gas recirculation sensor on google

change thermostat, but sounds like ur head gasket is damaged do engine copression test.

Intermittent door ajar switch contacts.

go to the link, it has everything u need to check to isolate the cause of a radom missfire

http://www.random-misfire.com/

For the first part next time it is doing it try messing with the hazard button on the dash, the noise will stop or go away for a while if that's your problem.
As for the bell it would be something differant than the hazard switch. Is any of the Idiot lights coming on when it does it?

call or go to your local chevy dealer and get along side a mechanic .they know the common probs and recalls on late models.malibu and impala have alot of factory recalls on them.go on line and
search engine malibu recalls (your year)and about 500 results will pertain to your car,not year necessarily,but same car.pay attn to model year changes.i.e. like 2001-2006. same body. Gino R

first make sure you have the right starter,and if you do then try putting a shime in it if this dont solve the problem the you might have a bad flywell and those are apain to change...

I had this problem (wipers only work on high) with my 2002 Chevy Malibu and had to replace the 6 amp diode (22059733) on the wiper control board. It is connected to the back of the wiper motor and is held on by 3 torx screws.
Radio Shack has them for $2.75 6A, 50V Rectifier Diodes (4-Pack) Model:276-1661