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germanshorthairs

2004 chevy crew blower motor resistor ?

11 posts in this topic

I have a 04 crew cab with 5.3 and I started to smell a burning rubber smell when the fan was on. I thought the blower motor was going out. Well I found out that the pigtail going to the resistor had melted into the resistor. Long story short I replaced the pigtail and the resistor and now I have a different problem. A/C and fan work great except (my fan has a 0-5 setting) when you turn fan to high speed setting (5) It works great at 1-2-3-4 but when you hit 5 it shuts off. Anyone have any ideas what happened?? Maybe I will just be happy to have 1-4 work. Thanks in advance.

Jason

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I would try repacing the blower motor. Only one thing that could have burned up the resistor. I think it was drawing to much amperage and melted the wires. Better to be safe otherwise it is likely to happen agian. Hope this helps.

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I had the same exact problem a couple months ago. I replaced the blower motor. resistor, a relay, the selector switch, only to find out they were not the problem. Had a mechanic look at it, and he fond it was the wire for the hi speed had gotten hot and burt for what ever reason. fixed the wire and worked great. Hope that helps and good luck

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Or its the high speed fuse, which I am pretty sure is on a separate fuse than the other speeds.

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Thanks for all the replies. Airjer- where is that fuse located I will start there. I will update if I figure this one out.

jason

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under hood fuse block. Possible a 40 amp fuse labeled blower motor.

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has a fuse but the relay should be what is controlling the load. I would double check the resistor to make sure that you did not bend it when it went back into the housing. You can check the wire as noted above to see if it is burned. The load on that wire is so extreme at start up it will toast the connection in the plug. Good luck.

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The resistors themselves are not part of the problem if the high speed is the only thing not working. I'm pretty sure we are talking about a manual HVAC system which has 5 individual blower speed settings. The highest bypasses all the resistors and supplies power to the coil of the high speed relay (which is part of the resistor assembly). The relay then closes the contacts which allows the blower motor to receive a separate power source just for the high speed blower operation. If the fuse is blown than there is no power for the blower to receive even if the relay is working.

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Well I checked the fuse under the hood and it is blown (40 amp). So I will pick up a new one and replace tommorrow. Airjer you must really know your stuff. Thanks for the help-I wil let you know tommorrow if this fixes it.

Jason

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Its a pretty good illusion anyways! grin

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