If the blower fan motor is not working intermittently it could be the fan motor itself. When problem occurs, give the blower motor housing some banging with your hand to test if the motor starts working correctly. If yes, the motor is failing and has to be replaced to rectify.
If air volume is low, check the cabin filter for clogging.
December, 31, 2010 AT 7:16 PM
I banged the blower motor housing and it turned right on I ordered a new blower motor and my cabin filter was not clogged Thanks for your help
January, 1, 2011 AT 1:35 PM
You're welcome. Glad to know you have found the cause ioof the problem.