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Was the battery load tested at a shop or auto parts store, Because a battery that has a shorted cell will still light the headlights and play the radio but won't have the amps needed to start the car. I think your battery has failed and if its only a year old it will still be under warranty, Bring it back to where you purchased it
Your HHR has electric power steering, So no fluid is needed
Bring it by your local auto body shop and they can open it for you, Order the parts needed and repair this professionally.
I can't find one from the aftermarket, So your Beretta must not come with one.
So if you have the proper fuel pressure and it turns over, Probably need to make sure the ignition switch is operational as I see all the parts stores carry these so it must be a common part that fails Napa http://partimages.genpt.com/largeimages/236429.jpg has them for about $20 and about an hours labor to replace it. But there are 2 different switches one for tilt wheel and without. You can locate a shop near you here http://repairpal.com/directory?address=02879&car_brand_names=Chevrolet
You can get that estimate here http://repairpal.com/estimator?car_type_id=1134 But you have to determine if your rotors need replacement as the shop will measure them to determine that and you can locate a shop near you here http://repairpal.com/directory?address=33311&car_brand_names=BMW
The book time which includes headliner assembly is 6 hours plus parts $160 each retail 2 are needed, So $800 is fair
The part is available here http://www.parts.com/schematics/4/4467050.gif #9 on this diagram www.parts.com Runs about $86 plus shipping and the book time to replace it is 2.8 hours. Hope this helps
The complete instructions are available for free at http://www.autozone.com sign up its free and put in your Bronco's info and choose repair guides then put heater core in the search box
This place has great reviews http://www.mssaudio.com/ located in Elk Grove