Ok It is a Heil gas furnace. No belts. The motor I hear running is apparently the electronic ignition that comes on when I turn the electric on to the furnace. The burner fires, heats and goes out once heated up, no blower comes on. I was told to clean the heat sensor since it may be corroded. That did not work. This is a duplex. I did not get an inspection, as they never do anything anyway. Thanks letmetellu and labman for your responses.

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The burner fires, heats and goes out once heated up, no blower comes on.

If your furnace heats but the blower never comes on then you have to expect that it is something wrond with the motor of the switch turning the motor on. Since I do not know how old your furnace is I have to explain that some moters are turned on with a fan switch that gets how and as it heats it make two points contact and turns the motor on.
On others the motor is turned on by a switch that is a timed switch. After the furnace has burned for 90 or 120 or so seconds the switch makes the contacts in a relay and the motor comes on.

I still think it is the seller's responsibility to fix this. Check the real estate law forum. If you are going to fix it yourself, check https://www.askmehelpdesk.com/heatin...ons-58313.html Go to the sequence of operations for a gas furnace. I think you will find the blower relay is failing to close, or the blower is bad. The relay is a $.25 part attached to a $300 board. Check the real estate forum, check the sticky and post back. And please don't start a third thread. https://www.askmehelpdesk.com/heatin...ace-67444.html

Only comes on when I switch it on posetion