Our kenmore s70 dryer heats up but wont stay hot all lint is out,never a problem why wont it stay hot

You have some blockage between lint trap and where the unit vents outside.

did you clean the inside venting circuit inside the dryer from the blower housing.lint trap etc if the dryers full of lint a clean outside vent system wont help

Here is the problem I think you have. Weak aged solenoids.
If a dryer produces some heat then their are 2 scenarios. It is clogged with lint, or the gas operator solenoids are getting hot and failing.Here is 2 of my home made videos. One shows basically before and after clean up and the other shows how to check and replace them coils:



More gas dryer enlightenment

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

You may need a new drum motor . It is probably burned out. ALso be certain you check you hose for the lint to escape .
I do not use high heat because it does get "too hot" and cannot be good for the dryer .

`check ur restricted vent, or bad coils, is the vent is restricted the heat would built , but won't exit the machine, the gas valve shuts off, an wont come back on till it cools down then the same thing will happen over an over and that wont let the timmer advance an finish its cycle, take the backvent off an turn ur leaf blower an blow the lint off the duct, new houses with a roof vent specially here in chicago have problems when the lint an ice combine create a big vent problem. if you have a roof vent, u can remove the screen on the vent at the roof, birds will not go in,seeking for heat, because the new dryers dont have a stand by pilot like the old ones, so they don't provide heat 24/7, and when they inuse they blow so much air is impossible for a bird to stand the temp an the speed of the hot air

Howdy: There is a thermostat inside the unit in the back. If this has lint clinging to it, it will shut off unit. Also the firing ignitor has two soleniods
that stick and turns off unit too early. But with the top of dryer hot I would say the heat always stays on and the thermostat shuts off ignitor. The firing should be a pulse type heat, not a constant heat. Good luck - Doug

did you also replace the thermostats?

Problem is likely:

- heating element, or
- one of several thermal limit switches in the electrical circuitry

If you want to further pursue, let me know.

check the vent outside it seems to be getting too hot and cycling the element off and on your safety therm.