I can turn the welder on and it can run all day but when I start welding with in a minute the overheat light will come on and it will stop feading wire. I'm trying to weld on mid temperature.

See what your duty cycle is suppose to be for that welder. It may have a internal fan that has stopped working to pull the heat out. Some have some don’t. If not add one and it may give you a little more time to weld

Your welder has a 20% duty cycle at 90 amps and 19.5v. This means you can weld for 2 minutes in every 10 minutes. It is normal for it to shut down if you exceed this welding time.

The Miller 212 has a 60% duty cycle. So for every ten minutes of welding the machine is designed to weld for 6 min and cool down for 4 min.

probably over heated and blew the reset button
100 amp welders have a duty cycle ( time in actual welding use ) of less than 20%
that means for welding for five minutes you have to let it cool down for 20 minutes
the lower the amps the longer you can weld for
beware tat the total amperage of the welder does not mean that you can weld for a long time at that amperage
on the plate on the welder is the duty cycle and you have to be aware of it or the machine will shut down

the machine i use for work will only come on after it gets hot and shuts off once its cooled down

What is the code number? It has a lot to do with it.

Your weldpack 100 has a duty cycle of only 20 t0 30%, meaning that your machine will weld for 2 to 3 minutes and then you need to let it cool down for the 8-7 minutes, then start again.
If the problem continues let me know.

Your Linner of the gun could have a kink in it.

1/4" plate with a 135 amp machine is probably beyond it's duty cycle abilites. If you are using a mixed gas, and pushing the max on the settings, it will be cutting out because it is designed to.
You might want to get a higher amperage welder for consistent welding of 1/4"
The 140 Pro maxes out at 5/16" using inner shield wire. and 1/8", or 10 guage with gas.

sounds like your welder has over heated and the Thermostat has come on
wait for 10 minutes and then try again
If that does not work fit a new PCB
Gilmore