3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Yea it is the blower motor resistor. The same thing happened to my 01 Dakota. I don't know where its located but if your truck is still under warranty you could take it back to the dealership and they'll take care of it for you.
Sounds like the resistor to me as well. You can use a test lamp to check it. Just have someone there to move the selector in the cab, and probe the individual speed circuits. A different one should become hot for each speed. Voltage will also be varied.
Edit - It is located, and accessible on the bottom of the HVAC unit on the assenger side of the vehicle.
i wouldnt worry awhole lot with testing it, i mean it dont cost but like $15, and it's prolly 99% gurantee that it the blowermotors resistor, i replaced alot of these workin at the dealership, but never one on a 3rd gen ram
1999 Dodge Ram 2500 4x4 CTD
had to bring it back...felt like no one knew who i was lol