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Pontiac G8 Questions

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2009 G8 GT. My temp will drop all the way down and a/c will not blow cold anymore. Display then flashed contact dealer. What could be causing this?
Every time I turn my wipers on the engine shuts off. No chugging
Engine indicates 4th cylinder not firing. Shop replaced plug but stop working due to oil leaking into plug and cylinder. Is it a gasket and if so which one and what is the cost to repair.
maybe my upper control arm and trailing arms are going bad.
sets P0175 rich condition bank #2
on my last brake job I just replaced the pads not the Roters and when I press the brakes I get the rattling I'm wondering if it's the struts
The bottom half is flashing and garbled...This is on all readouts on that screen...The onstar bub light is also flashing red...Is there any interaction between the two?
In the past 2 years this code always shows up when I take the car to the dealer. About a year ago they found what they called a major problem, so far they have replaced the solenoid valve, rear evap canister, and left axle seal and also the fuel cap. Now a year later and the code is popping up again and they are telling me thesmoke test is negative. I feel like I purchased a lemon and need advice. Thanks
My brake lights come on when I am driving the car, and the brake lights go off when I press on the brake pedal.
I have replaced the 15amp fuses in the fuse box and moved the relays around. I believe it is a loos connection but having the horns below the headlights on the front fascia means I have to remove the front bumper to even get at them. Also hear audible clicks from he fuse box when horn should sound.
I just noticed that my AC isnt blowing cold anymore, and I hear an audible hiss coming through the vents and a slight burning smell that wasnt there before. Hiss and smell only occur when AC is on, no noise or smell otherwise. Also how much would the repair cost. Thank you.
For the 3rd. time the system shows incorret tire pressure and the warning light keeps flashing. How do I reset system ??
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