Here is another service manual which looks more relevant
http://www.servicematters.com/m...library/docs/SAM0059.pdf

Your first link looks like the tube with the wires coming out of it is the defrost heater. Could not find a spec for it but is probably around 30 ohms.

The manual does show a thermal fuse in the evap area. This should be 0 ohms.

Also shows a thermistor, the resistance should change with temperature, see the table in the manual.

You will need a meter.
If you do not have one, I would suggest you purchase a meter. You can get a decent digital multimeter for under $20.00. You do not need fancy though it is nice if the leads are a couple feet long.
If it saves ordering one unnecessary part it has paid for itself and you end up owning a useful tool.
Most places will not let you return electrical parts so if you order it, you own it.
A couple things to watch when measuring ohms and continuity
1. Always remove power from the machine otherwise you could blow your meter.
2. Always disconnect at least one side of any device you are checking. This eliminates the possibility of measuring an alternate/parallel circuit path.
3. When checking for closed contacts and continuity use the lowest scale (Usually 200 ohms). Then try higher scales. This scale is 0 to 200 ohms so if the device you are measuring is 300 ohms this scale would show an open circuit which it is not, you are just measuring outside the scale's dynamic range.

There is a good STICKY at the start of this forum about it's use.

woodchuckie
Hopefully the heater is OK. I also would be looking at a jiggery pokery if it was blown. Perhaps a length of pipe heating cable would work here depending on the wattage.