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If you could remove the front panel and take a picture of your gas valve, the ignition module and also the front face of the furnace above the burner rack, it would be helpful.
Without knowing exactly what you have this is a wag.
Burner comes on, heats for a period of time, fan limit may or may not reach temp to start fan, high limit cuts out power to gas valve. Having the fan running from the t'stat switch gets you more heat time but burners still go off before heat cycle is complete.
After 20 years of service, it doesn't owe you anything, I would consider a new furnace before dropping too much money on this one. They are not cars and an old Colman was never the Porsche of the furnace world. Just a thought...
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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