Question about 2003 Chevrolet TrailBlazer

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Blower motor runs even when vehicle is turned off no key in ignition. I had to remove the fuse for the blower motor.

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You need to check the blower motor resistor.

Posted on Jan 21, 2010

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Which motor? radiator fans? or cabin air motor?

Posted on Jan 23, 2010

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2 Answers

A.c. cooling fan runs constantly on high even with ignition off and key out


A/C - Heater blower motor ! What make , model and year vehicle ? Manual or automatic climate control ? Could be a bad blower motor control module , a high blow relay contacts stuck closed .

Mar 28, 2017 | Cars & Trucks

2 Answers

Hvac blower will not shut off, even when vehicle is shut off and key is out of the ignition


Hi, the likely problem is a shorted blower relay. Unfortunately, your relay is integrated into the motor/resistor assembly, so you would need to replace the whole thing to fix it. You can disable the blower high setting by pulling out the IGN3 fuse under the hood, but I'm not sure the car will run without that fuse. At least you wouldn't have to disconnect the battery to keep it from draining. Please let me know if you would like procedures to replace the blower motor assembly, and thanks for using FixYa.

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Feb 27, 2011 | 2002 Pontiac Aztek

1 Answer

Where is the blower motor? heater in car dosent blow. not under hood, cant get through glover compartment.


This work for 1998 Buick Century 3.1L SFI OHV 6cyl; the blower motor is a variable speed motor. The higher the voltage applied to the motor, the faster the speed. Depending on the HVAC (Heater Ventilation Air Conditioning) option installed in the vehicle, blower speed control could be through a set of resistors or through a solid-state blower motor control module.

In general, this system is reliable. Because so many of the control operations are electronic, special diagnostic equipment really should be used for system diagnostics and check-out. An authorized technician using a scan tool can most quickly locate HVAC problems.

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Fig. Typical behind-the-instrument panel view of HVAC related components. Depending on the HVAC option, not all components are used on all vehicles (click for zoom)

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Fig. Typical HVAC operation schematic

An inoperative blower motor could be caused by the following:

* Blown fuse(s). The fuse should be replaced. There may be both a LOW BLOWER and HIGH BLOWER fuse. Some models may also call it the HVAC fuse. Even the RADIO fuse is used in some applications. Check them all. If a fuse is blown there may be a short to ground in one of the power supply circuits.
* Open Circuit. Check the circuit between the ignition switch and the blower motor, and the blower motor ground circuit. Repair as necessary. * Faulty blower switch. A faulty blower switch should be replaced. * Most heater blower circuits also include a blower motor relay (look in the underdash convenience center), as well as a blow motor resistor. These items should be checked especially if the blower runs in one or two speeds, but not all speeds selected.

REMOVAL & INSTALLATION

  1. Disconnect the negative battery cable.
  2. The blower motor is located on the passenger side of the vehicle, under the instrument panel. Remove the right side sound insulator (trim panel) by removing the retainers and disconnecting the courtesy lamp.
  3. Detach the blower motor electrical connector. Some applications may have cooling hose to the motor which should be disconnected.
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Fig. Blower motor and fan assembly removal

  1. Unfasten the blower motor mounting screws, then remove the blower motor from the vehicle.
  2. If the blower motor fan (also called a 'squirrel cage') must be replaced, use the following procedure:
NOTE Do not hammer on the motor to remove or install the fan. Do not apply force to the motor housing to seat the fan on the motor, or motor/shaft bearing damage could result. Do not apply pressure to the fan rim. Be sure the correct replacement part is used.
  1. Remove the metal star clip retaining the fan cage to the motor shaft.
  2. Remove the fan by pulling straight out.
To install:
  1. If removed, install the blower motor fan, as follows:
    1. Install the replacement fan cage onto the motor shaft.
    2. Adjust the fan cage to get a clearance of 0.30 inch (7.5mm) to the motor mount plate.
  2. Install the remaining components in the reverse of the removal procedure. Make sure the electrical connection is secure. Tighten the motor screws to 14 ft. lbs. (20 Nm).
  3. Connect the negative battery cable, then test the blower motor for proper operations


I hope this helps (remember to rate and comment this answer).

Nov 17, 2010 | 1998 Buick Century

1 Answer

Heater airconditioner blower motor runs all the time without ignition switch in run position . runs without the key in the switch. the only way to turn it off is to remove the fuse that powers the blower...


If you haven't fixed this yet, your Blower motor resister module is bad. It is located to the left of the blower motor and mounted in the A/C air box. Just pull the right kick panel down and you will see it.

May 12, 2010 | 1995 Oldsmobile Aurora

1 Answer

2000 Jetta 2.0 gasoline engine. Multiple electrical problems. headlights will not turn on, only hi beam and only while holding lever up. A/C blower motor, wipers, and turn signals shut off as soon as...


most likely you have a very bad ignition switch, the only other pathway for switched acc. to operate when key is off is if someone has had the wires feeding the fuse box crossed. so unless you had recent wiring done by an amature, you need and ignition switch. after replaceing you may still need to replace some fuses or bulbs that didn't like being powered at the wrong time.

Mar 31, 2009 | 2000 Volkswagen Jetta TDI

1 Answer

Replaced blower motor, now runs continuously.


Run's continuously ? High speed , low , med 1,2, 3 . ????
Probably the high speed relay contact's stuck closed . The fuse for the high blower is hot at all times , low blower fuse is hot only with key on. It sparks becaused the motor turns on . If it had a short the fuse would blow . The blower motor relay is part of the resistor pack near the blower motor .

Oct 01, 2017 | 2000 Oldsmobile Intrigue

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