One problem related to water pump has been reported for the 2011 Ford Mustang. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Ford Mustang based on all problems reported for the 2011 Mustang.
I arrived home from work and noticed some coolant leaking out of my car. I popped the hood and saw coolant seeping from the weep hole. When I cranked the car back up, coolant started pouring out underneath the car, bad water pump. I had it towed to dealership today and was told there is a technical bulletin on the hose leading to water pump because it allows air in and causes the water pump to fail. The entire area has to be replaced with a new hose that includes a check valve, so it doesn't continue to happen. This is an obvious manufacturing defect. I was told any car that came in without a check valve has to be replaced with the new hose including a check valve and that I have to incur the entire expense $486 plus tax because hoses are not covered by powertrain warranty. I called Ford and was told due to no recall, I would not be reimbursed for this service. Even though, he also admitted that there is a technical bulletin issued by Ford regarding this problem. I have googled this and the same problem is all over the Mustang forums. Ford is refusing to stand by their product. Luckily, I was at home when this occurred and not out traveling the highway. This would cause the car to overheat and an accident can occur. Ford is refusing to cover any cost of the repair. This is a safety issue and concerns numerous consumers, not just me.