I've just had similar problems with an old TC71. I changed the thermostats (yes both) and heating element and still couldn't get the machine to heat.
Then I followed the wires from the thermostat back, some run under the (condenser) fan housing to an impossibly hidden little float chamber switch (it must cut off the heating elements once the water tank is full). In my machine the float movement was "lint-stuck" and once freed I had a fully functioning dryer again.
The machine is now near 15-years old and will hopefully last for many years to come! Maybe this tip might help somebody?
Pip (the was very puzzled), March 2014