Question about 2005 Chevrolet TrailBlazer LT

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Blower will not work , put a new one idn still nothing ? is the the relay / harness ?

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Check your blower resistor it should have three to five wires to it and located close to the blower motor

Posted on Nov 22, 2013

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Your talking about the interior blower? If the first 3 settings don't work, you have to replace the blower resistor. The relay is a different story. Though the relay could be built in the resistor. I'm thinking this is not your case. The resistor controls the speeds of the blower, until it gets to high. Then the relay kicks in to give the blower full power. I would say replace the resistor. I good thing to remember is, If you get any speed from the blower, the resistor is bad. If you get nothing,check the fuse, replace it, if it blows again, replace the blower. If the fuse doesn't blow, then start looking at the controller and wires. This advice goes for all makes and models.

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1 Answer

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You should have voltage at the resistor and at the relay.

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The blower motor fails because the resistor/ relay / wiring harness assembly overheats and can melt. Some of these have even caught fire. You're going to want to replace the blower motor resistor/relay and wiring harness assembly assembly too.
Check out all the wiring that goes into the resistor for heat damage. This assembly sits right next to the blower motor right above where the passengers feet would be. The resistor/relay is about the size of a pack of cigarettes and you'll see it right away. Make sure to disconnect the battery before working on any of this so you don't cause any more trouble while splicing in the new harness. I just did this on my 2006 Chevy truck and my blower motor was ok. I just had to replace the resistor/relay and splice in a new wiring harness. It cost $180.00 just for that stuff.

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a common problem ( mine did it too ) is the blower control relay, under the glove box and behind. it requires taking out the glove box, buying a relay and installing it. unfortunately, the relay often cooks the incoming wire harness, requiring cutting those wires and putting cut wires into new harness. check with www.wjjeeps.com for details.

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You need to have a look at your AC switch , dim and bright toggle switch and also the relay system on your fuse box and check for relays that might be heating up and the possibility of water ingress onto the fuse box which have been a vw problem for many years and if you dont find any problem there then start looking for electrical harnesses that may be chafed or broken and shorting out inside the harness but the fact that you can trigger it off points to a relay.

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