There are of course two switches on the dryer. One is a low pressure cut-out (which got updated to a low and high pressure cut-out) and the temperature switch. I guess the big question here is: Has the temperature switch been converted to the later type or not? The later type works on pressure rather than temperature and enters the pressurized part of the dryer. We were supplied with the later switches and updated dryers almost ten years ago at the dealer. If your switch is a brass-looking piece it's the old one that doesn't enter the pressurized part of the system. If it has red(or green)plastic on it, it's the later one and requires a discharge/recharge to replace.
Regards,
Randy D.