Question about Chevrolet Silverado 2500HD

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2004 silverado 2500HD i replaced the resistor and then replaced the blower motor. next the harness plug to the resistor. still the fan speed runs on 5 and all other speeds just blow the fuse i think there has to be a short in the wires somewhere but ?????

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I just sent you a follow-up comment on your last problem.

Posted on Feb 02, 2010

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1 Answer

2003 chevy silverado 2500hd heater fan goes on and off in cold weather


If it does it at all speeds, I would look at the controller. Loose plug or contact inside it. If it does it only in low speeds or only high, replace the resistor, behind the blower.

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2004 Chevy Silverado 2500HD ac stopped blowing we changed motor and resistor and still nothing we have cold air running when u drive down road but no pressure


I'm going to assume you have the manual control version. The relay in the resistor allows the fan to run on high and bypass the resistor circuits. There is a 40amp blower fuse for high speed and a 30amp fuse for the other speeds. The motor is grounded thru the resistor.
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This will not be the switch itself it will be the blower motor resistor itself.These vehicles have had a notorious tsb for these resistors doing this.This resistor is located right next to the blower motor on the evaporator box.It's on the pass front side right below the dash.I hope I could help...rate me accordingly

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1 Answer

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Check the blower resistor and the connector. The tend to fry the terminals together. You can get a connector and install it yourself fairly easily.

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1 Answer

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Well had the same issue on my duel climate controll 04 2500HD but changing the heater control solved the different temp.The only other thing would be your mixer door motor.There are two,one for DR side is probibly stuck..As far as the blower motor.The resister should have taken care of that.Sounds like you may have another bad one.May want to take a volt meter to the resister plug in and run you different fan speed just to make sure that you get voltage to the different conecters.

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1 Answer

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The switch, high blower speed relay or the wire harness at the blower motor has gone bad. The highest setting 5 has no resistor, so the blower runs on high but the high current flow ends up burning up the switch's contact on that setting or the relay and may be the resistor wire harness at the blower motor has gone bad. Common would be the switch it self, if the switch is good. Then it's going to be the blower relay or wire leads at the speed resistor by the blower motor under the glove box by the passenger leg compartment. Keep me posted, be glad to help you get your Silverado running 100% again soon.

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there is no relay for the heater fan it's a 15 amp fuse and is on the accessories circuit. the reostat is responsible for all 3 speeds .with the key off there should be no voltage to the blower motor whether the fans speed fan switch is on or off. the fuse will be located in the fuse paneleither on the drivers left side in the dash or underneath the dash in the fuse block. you have a short in the harness that is under the dash and most likely it's a bad plug on the harness. your going to have to do some searching but that's where the problem short is... please rate

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