2003 Chevy trailblazer, when using the air conditioning, putting the mode selector control in the panel position (controls the direction of the airflow) no air comes out of the 4 panel (front dash) air conditioning vents but it does come out of the floor and the defrost vent. any ideas of what to check?
{: ) Check first the fuse labeled HVAC1 10A at the rear fuseblock. If okay, the mode actuator could be faulty. You can try this: turn ignition switch and a/c off for a minute. Then turn ignition on, wait forty seconds. Afterwards, start the engine, and check your a/c again.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Some 2005 & 2006 GM pickups & trailblazers had a software issue with their climate control systems in which the HVAC door(s) which regulate each vent section, (including adequate heating and air conditioning) wouldn't operate as selected by the control knob. Originally this was taken care of under a repair bulletin put out by GM. You can notify your local dealership and check to see if the bulletin is still valid? If not, the dealer will update the software while checking for correct operation of the door regulators which in some cases was also an issue.
Hi Steve , your vehicle has electronic throttle control . I don't know if you are aware of this. The gas pedal have position sensors an a wiring connector with 4-6 wires .these wires are connected to the engine computer . an there is a electric motor on the throttle body assembly , the computer opens an closes the throttle . You probably have codes stored in the engine computer .
Reduced Engine Power Mode
When the PCM detects a condition with the TAC system the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
?€¢
Acceleration limiting--The control module will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
?€¢
Limited throttle mode--The control module will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
?€¢
Throttle default mode--The control module will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
?€¢
Forced idle mode--The control module will perform the following actions:
-
Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.
-
Ignore accelerator pedal input.
?€¢
Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.
Mode door module. This module controls the direction of the air flow. If the module is bad, it will continue to push the door a certain way even it can not move anymore.
It sounds like you have two problems. First a question though; Is your heating and air conditioning control on the dash automatic (has two knobs that rotate and a display screen in the middle), or manual (has two levers that move up and down for driver/passenger temp and a separate fan knob and mode knob).
In response to the vents being stuck on defrost and floor, from experience i can say that the most likely cause is the mode actuator has failed. If your battery has recently gone dead, that could have brought the problem to the surface. When the battery has gone dead, the heating and air conditioning controls relearn all the positions of the actuators behind the dash when the vehicle has been re-started. If there is a position sensor failing (which happens quite often) in one of the actuators, the heating and air conditioning controls won't be able to learn the correct position of the actuator and (in your case) defaults to the defrost/floor position.
The only way to fix that would be to replace the actuator. I would like to know what type of heating and air conditioning controls you have (manual or automatic) before i say anything on the blower only working on 5.
will i have bad news for you, your heater/a/c system is all electronic. ( not like the old days when we seen this there was just a broken vacuum hose ) now all the doors inside the heater system are run by electric motors they call them actuator's now days and they are all controlled by a computer called a HVAC control module, and most likely this is what has went bad on your truck.....sorry
i've got a 2003, and i believe the parts and procedures are the same for the years. there are screws in the dash trim by the ciggarette lighter, and more on the underneath of the dash pad where the gauge cluster is. then carefully pop the dash trim out. there are retaining clips that hold it in besides the screws. they should pop out without too much effort. i'd start near the radio and be careful. there also may be two more screws near the bottom of the steering wheel that you'll have to remove the trim below it to get at.
you should be able to remove the beuty couver of the front of you dash, and find 4 screws holding the heater control Assembly in place, comes out of the front, easy re & re good luck
normal condition lamp sensor on top of instrument panel turns lamps on and off with lighting conditions when headlamps are on dash lights are on whwn drl,s are on dash lamps are off
If it will not switch to any different positions,and you did not have this problem prior to repair.Check for a leaking vacuum line to the control unit.The line should run through the firewall to the control unit.Good Luck!!!
×