Question about 2003 Chevrolet TrailBlazer

1 Answer

2003 Chevy TrailBlazer..bad rattling under truck and feet.

2003 Chevy TrailBlazer..changed resistor and the front AC is blowing on all settings now but the rear still don't work, what could that be? Also, when I go over any type of bumpy surface, underneath the truck rattles real bad and I can feel it under my feet, any idea what that may be? My husband thinks I'm crazy lol..but I know something is wrong underneath the truck...please help!!

Posted by on

  • 1 more comment 
  • melindasnead May 13, 2010

    My AC was only blowing on #3 setting and I took it back to the dealer, they changed the resistor and now it blows on all the settings. The rear a/c is not working at all. The dealer said I have to bring it back up to them (cuz I had to have the truck back that day) that they had to figure out why the back isn't blowing. Any ideas what that problem can be? Also, there is a bad rattling under the truck, under my feet. I was thinking maybe the muffler was loose but the dealer said no. What could be loose and rattling under the truck around the area where my feet is?

  • melindasnead May 14, 2010 you know where the rear resistor or blower motor is?

  • yadayada
    yadayada May 14, 2010

    the rear blower resistor would not cause noise under the truck



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 7,353 Answers

It could be a bad rear blower motor, or resistor? theres a lot under the truck that could make noise, have a repair shop check it and make repairs.

Posted on May 14, 2010

Testimonial: " been very helpful and polite if I may say so myself, unlike other "helpers" on here. Have a blessed day!"


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

03'Chevy TrailBlazer..rear ac don't work, rattling under truck

When the dealer replaced your resistor, they probably unhooked the battery (naturally for safety). However, this can blow the actuators unfortunately, especially if it was set to on when they unhooked and rehooked the battery back up. Pretty common problem. The rattling very well could be your stabilizer bar end links. Grab a hold and try to wiggle, should be no movement. Pretty common for these to go out also. When replacing these, get new ones that are greasable with zirks. OEM's are not serviceable.

Apr 27, 2017 | 2003 Chevrolet TrailBlazer

1 Answer

Bad Clutch Fan? Rear ac/heat don't work front only works on 4

The fan clutch isnt engaged at all times, therefore it may be normal to hold it in place (not recommended). On these trailblazer's 4.2L engine the fan clutch is electronically controlled. Usually when this vehicle's fan clutch malfunctions, there is a random ticking noise while idling or at a stop, also the "service engine soon" may turn on. As for the the fan speed problem, this may be a faulty blower resistor malf (typical) or climate control unit may be faulty. Hopefully this helps!!

May 05, 2010 | 2003 Chevrolet TrailBlazer

2 Answers

Changed the battery out and now the ac will not

does the air blow at all, that is the first question? If so, then it may be what the last response was, just stuck in one position. If not, then check the fuses, if the fuse is okay then there is only a couple more things to check. Pull the passengers side cover off under the dash, beneath the glove box, locate the blower motor relay/resistor and disconnect the plug (hopefully the plug is not melted to the switch). Use a test light to see if you are getting power from the fan speed switch. If you are getting power from all speed positions then it may be the relay/resistor switch bad or a bad blower motor, but you can rule out a bad blower motor by testing it seperately and if it works then it's the relay/resistor switch that is bad.If it is melted, Chevrolet had issues with this part going out from the beginning and said they had it fixed and canceled a recall in 04. Seems the ground is not sufficient enough and causes the wire to get hot, melting the plug and relay/resistor switch losing the ground and causing the blower not to work. Haven't heard of any trailblazers burning to the ground from this problem but it does cause a bit of a headache since the parts isn't cheap, plus you have to buy their wire harness and plug for about 100.00 and fight putting everything back in since it's up under the dash. They have pleny of feet room and that's just what it was meant for, your feet, not your head, shoulders, and arms. Hope this helped if not maybe it will for someone else. I had to deal with this myself on my 05. Thanks, Dale

Jul 29, 2009 | 2006 Chevrolet Trailblazer

3 Answers

2003 Chevy Trailblazer AC won't turn off

Check on and off switch it may be defective.

Jun 29, 2009 | 2000 Chevrolet Impala

2 Answers

2003 Chevy Trailblazer my AC blower won't turn off!

you have a short to power which will cause it to stay on constantly check your blower motor resistor pack to ensure that it is working and check the wires going to the blower to make sure you have a power and a ground

Jun 29, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

A/c blower issue. 2202 chevy trailblazer

your blower resistor bad or the blower motor control switch is bad. no air flow from top vent make sure vent open.because you can manual adjust them not to blow air on you.if all is have leaking vacuum hose or vacuum actuator.or air door stuck.the AC and HEATER control bad.its not allowing vacuum to open air door.

Jun 22, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Blower motor problems/ac problems

List of possibilities :
blower motor

May 18, 2009 | 2006 Chevrolet Trailblazer

2 Answers

2003 Chevy Trailblazer - Rear Heat/AC Controls Don't Work

Sorry, I don't have an answer, but have the same problem. Did you ever figure out what was wrong?

Apr 16, 2009 | 2003 Chevrolet Tahoe

Not finding what you are looking for?
2003 Chevrolet TrailBlazer Logo

675 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

76109 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8269 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides