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Newport News, VA
I would not recommend added stop leak to the radiator, it might stop the leak, but it may also create other problems in the cooling system and /or heating system. Is it possible that your vehicle is still under the factory powertrain warranty? The radiator would be covered if it is. Please call me direct and have your VIN number ready, I will check to see if the warranty is still valid. Thank You, Gene Woodson Suttle Motors 757-886-1819 email@example.com
Since air bags are as safety system, I would encourage you to have it checked out professionally, at a GM dealership. Having it checked at A GM dealer has the advantage of all the factory information, and if any new bulletins have been released regarding the concern. Possibly the repair may be covered under warranty. We would be happy to check this out for you, call me direct at 757-886-1819 to schedule an appointment.
The Oil and Battery lights come on when the engine stalls because; the engine oil pressure drops to zero, and the battery is not being charged due to the engine not running. This is not an indication that the problem is due to either one. As for the clicking sound and not turning over, suspect low battery voltage to the starter-possibly due to excessive corrosion at the battery terminals, or loose battery terminals.