This 10 year old dryer stopped heating. I knew a Maytag would have much more life left in it than that (even my Mom's lowly GE lasted more than 40 years!) so I was sure it could be fixed. Without doing any testing, I had just guessed that the glow bar was bad and replaced it. But that wasn't the problem - the old glow bar still had continuity as tested with my ohmmeter. So I dug in deeper and looked over the schematic posted on PartSelect's website. The glow bar would light up and then go out, but the gas valve never opened. After probing the two solenoid coils for voltage, I decided the primary solenoid was bad. This was confirmed when I took the connector off and checked with an ohmmeter (never do this with the wires connected!) and found no connection at all between the two terminals.
Ordering the new part from PartSelect was fast and easy and my part arrived in two days. The solenoid coil on this dryer can be removed from the gas valve without taking any gas lines apart - I don't know if they're all like that, but it's a great feature. The only hard thing is that there is no access door to inspect the flame like older gas dryers. You have to take the front panel off to watch it working, but that just involves the four screws around the door opening.
If your pre-Whirlpool Maytag dryer is giving you trouble, take heart! These are great machines that last long, are easy to fix, and parts are easier than ever to get with PartSelect!