November 5, 2008I have a 2003 2500hd crew cab. The fan motor for the heater/ac quit working last month. I replaced the fuse but that was not the problem. So I took the fan motor out and before buying a replacement, I ran wires from the battery to the motor to verify that the motor was bad. The motor works when it is wired directly. I thought that it might be the switch, but when I turn the switch on, the light on the dash comes on telling me that the a/c is on. I can also hear the compressor for the a/c kick in, so I know that the switch is working in some way. I am not real good with electrical problems so I am looking for some advice *or* possible solutions to this issue.
Subscribers : thatguy2
November 5, 2008Check your fan/blower relay...Just because the light comes on doesent mean the blower is good.
November 5, 2008Another common problem is a failed blower speed resistor. It''s a multi-plug unit and it''s ususally near the blower motor, sometimes even mounted on the motor housing itself.
November 5, 2008Thank you Jack. But now I am going to sound really bad, but where is the relay located?
November 6, 2008I think there was a recall on the relay. Mine went out in the first year and I think its under dash next to the blower motor.
November 6, 2008Does it still work on high? Blower motor resistor packs are a common failure. If the resistor pack is the problem, usually the fan will not work on speeds 1 and 2, but it still operates in the higher settings. If it doesn''t work at all, check the relay.
If you''re replacing the resistor pack: Not sure if it was moved starting in the 03 trucks, but on my year it''s plugged in to the blower motor housing in the passenger footwell. Remove the lower dash cover, and it''''s plugged into the left (driver) side of the motor housing. Tip - Buy the part from the dealer first (~$30), so you see what it looks like and how to release the plug. Might save you some frustration and cussing....