Why are you blaming carrier's customer service? If the warranty is expired, then its expired!
Like others have said...who installed it?
Did you have annual maintenance on it?
You're right, it is expired. The unit is only 6 1/2 years old and they will not "help" me a little bit.. I will send a letter to the builder (Standard Pacific) and other builders around here letting them know about Carriers customer service.