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The ignitor will light, the blower will start up and run for a few minutes and then the system will shut down, and the blower will continue to run and cool down. The ignitor is not working properly, the ignitor has carbon build-up and need to be removed, cleaned all the black carbon from the ignitor with a little piece of sand paper and replaced, turn the heat back on and this should correct the problem.
There is what is called a low pressure switch in the system that will not allow the system to run unless there is a complete charge in the system, what is happening is that the system is "Short cycling" due to low pressure, you can purchase a re charge kit at the local Autozone or Pepboys and that will fix the problem.
Even when the key is off with the engine cool after a few minutes? Or just a few minutes after it is turned off with the key?
Check or change your thermostat and flush the radiator with the heater running on hot as it can be. Can you see inside the radiator? If you can is the water flowing good? If it is not after you change you thermostat and it still runs hot then it is your water pump. Is it running hot?