I have a 2002 Explorer that is making a thumping sound in the compartment that houses the rear air conditioner blower. The compartment is located in the left rear panel behind the left rear wheel. It makes the noise when the air conditioner and/or blower is off or on. Is the fuel pump located in this area? With the AC off, the engine off and the key turned on there is a humming sound that is interrupted at a regular interval (about 1 second) by the thumping noise. Can anyone provide any assistance? Is there some place that I can go to find the applicable section of a service manual on line, or will I have to go to the dealership?
Thanks in advance.