My problem is that the air conditioning unit (Trane) runs fine however when the blower turns on it will run for 25-30 seconds and then turns off for 60-90 secords before turning on again. If I run the furnace the blower operates as expected. One service company has indicated that it sounds like a winding on the blower fan motor has gone bad causing this intermitten cycling to occur and suggest replacing the motor. Has anyone had a similar problem or heard of something like this that could confirm their findings or dispute them. Thank you for your help!

Check the capiciter,, they only cost a few dollars much less than buying a new motor,if the winding is bad in motor I don`t think it would run at all,not even a little bit.. if you don`t have the means to check capiciter take it to a electric shop and have it tested

My problem is that the air conditioning unit (Trane) runs fine however when the blower turns on it will run for 25-30 seconds and then turns off for 60-90 secords before turning on again. If I run the furnace the blower operates as expected

If you run the furnace and the blower operates normally it is probably not the motor or capacitor But something in the A/C circuit. It could be the control board or your thermostst.

What is the model number and brand of your thermostat?

My problem is that the air conditioning unit (Trane) runs fine however when the blower turns on it will run for 25-30 seconds and then turns off for 60-90 secords before turning on again. If I run the furnace the blower operates as expected

If you run the furnace and the blower operates normally it is probably not the motor or capacitor But something in the A/C circuit. It could be the control board or your thermostst.

What is the model number and brand of your thermostat?

wmproop's - it's a Honeywell model tb112d1005 or pf1a, sorry but the prior owner installed and there are no obviouse markings on the unit. Thank for your help!

Sorry no numbers in Honeywell factory list matches the numbers you provided.