The dryer blew only cold air

I opened the front lower cover to get the schematics. Looked for the most probable part that was bad. Then traced wiring from the gas solenoid to find the thermal fuse.
I opened the back. Took the two wires off the thermal fuse and put my Ohm meter from terminal to terminal. As I got no reading, I ordered a new fuse. It took about 5 minutes to replace and button the dryer back up. This is the second time I have had to replace this fuse.