I have a 08 with 50,000 miles. I noticed coolant on the garage floor. I took to dealer and was told it needed a water pump and will cost 1100.00. Gm will not warranty because 8 months over 5 year mark. When I went back to dealer they said they had air in the lines. They replaced temp gauge and still issue. Told me I may need a new engine?? This car is only driven 6 months a year. Also said timing may be off because its ticking loudly. My engine never overheated. Temp usually 190-198 on a hot day. Can anyone help?