Question about 2005 Chevrolet Trailblazer Ext

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2005 trailblazer fan motor vibrates whole dash

Is this something stuck in the motor/fan-- or bearings? it vibrates real bat on 5 and less on 1 it looks easy to change out? what do you think?

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It is very likely that there is something in the squirrel cage fan blower wheel. It is fairly easy to pull it out and check.

Posted on Nov 13, 2008

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Weird noise and vibration in the dash when I turn my heater on in my 2003 Chevy trailblazer LS... When the heat is higher then the #3 setting it vibrates bad I can feel it all the way down in the petals......


Your heating system is broke in the dash. The doors or gates that change where the air is to go, has a broken hindge or actuator. Your heat is set to defalt to the defrosters as a safety thing. The vibration, I would say, is your fan & it may have been the thing that started your whole problem. The fan has something wrong W/ it, weather it has dropped, the shaft that it runs on is bad, or it is just going to the bad. To fix, the whole dash has to be dropped so that the gates or doors can be accessed for repairs & the fan, it's half in & half out of the passenger compartment. I've had 3 or 4 dashes out to do this work but it is TIME CONSUMING. Wish you the best, GOD BLESS.....

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Problem with dlc not reading


- Check Voltage on pin 16 (BAT) and chassis (or body) ground. Always 12 Volts.
- Connect the Multimeter and check continuity between pin 4 (CG) and chassis ground. Less than 1 Ohms.
- Connect the Multimeter between pin 5 (SG) and chassis ground and check the continuity. Less than 1 Ohms.

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- Check the fuse named OBD2 in the lower finish panel, under the dash on passenger side.
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Dec 09, 2012 | 2005 Toyota ECHO

1 Answer

Cannot get obd2 scanner to read my 2005 toyota echo at the dlc


- Check Voltage on pin 16 (BAT) and chassis (or body) ground. Always 12 Volts.
- Connect the Multimeter and check continuity between pin 4 (CG) and chassis ground. Less than 1 Ohms.
- Connect the Multimeter between pin 5 (SG) and chassis ground and check the continuity. Less than 1 Ohms.

9152a69f-35fe-4a01-bc27-3a599d95ff3c.jpg

- Check the fuse named OBD2 in the lower finish panel, under the dash on passenger side.
7d30bd8c-2d47-4126-90b3-dad061cf175a.jpg

Thank you for visiting Fixya.

Dec 09, 2012 | 2005 Toyota ECHO

1 Answer

2005 trailblazer, started truck this morning, windows were foggy, turned on defrost but the fan was not blowing, could feel a little air flow but was not blowing on any # cycle 1-5. What might be wrong


Hello: Go under the dash, passenger side. Remove under dash cover. Look straight ahead, you will see the blower motor with 2 wires. follow these wires to the blower motor model, on the module you will see a connector w/6 wires, these wires could be burnt, if so then the module may also be burned. You can get a repair harness at a GM dealer, You will have to splice it in. Make sure you line up the new connector wit the old so you get the wires in the proper order. If the module is burnt then you will have to replace it also. The blower motor is usually ok unless it is noisy or locked up. This is a common problem.

Jun 29, 2011 | 2005 Chevrolet TrailBlazer

2 Answers

My blower motor only works on 1 & 2 & 3 speeds dont work on 4 & 5. I was told to buy a blower motor. Need to know where this is located to replace on my 2005 Chevrolet Trailblazer


If your blower works at some speeds and not others, the likelihood of the blower motor needing to be replaced is low. The more common problems would be either the switch or the resister that regulates the motor speed. The resistor is usually located in the air duct under the dash.

Jun 17, 2011 | 2005 Chevrolet TrailBlazer

1 Answer

Started in cold weather yesterday. Ran real rough, almost like a motor mount bad. Fan turns by itself when turned with your hand.


If it only happens in cold weather, check your intake manifold bolts for tightness. #5 & #6 by the firewall are easiest to check. Some people will find these not even hand tight = rough running car.

However, if (when cold) your car is vibrating at idle IN GEAR and stopped, this would be a motor mount on Envoys and Trailblazer, very common.


Fan shouldn't turn by itself, you may have a bad fan clutch.

Mar 13, 2011 | 2006 GMC Envoy

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piece broken on fan blade of heater or it is warped. probably will have to replace unit.

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Air only works on setting 4 or 5, and is very loud


check fan switch and fan motor as it sounds like the fan is causing the vibration,you need to look under the dash to get more info

Oct 28, 2009 | 2000 Chevrolet Impala

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A/C and heater raddle/vibration when fan control turned on


That vibration is caused by something lying in the fan. This causes an imbalance in the fan that gives off the vibration. You will have to remove the blower motor in order to get to the fan and clear the fan of whatever is stuck in the fan.

Oct 06, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

Ac blower


needs a recircultion door, the stops break and the door is stuck between recirc. and fresh . the whole dash needs to come out. its about a 4and 1/2 hour job at the dealer. it can be done in less if you find a good tech. that is familiar.

May 19, 2009 | 2004 Dodge Ram 2500

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