2003 Chevy Trailblazer
V8
Battery replacement
work done to repair = None
tech = JK
question = After having the battery replaced the dash vents will no
longer blow air.
JK:
I will need a little more info to be of some help. Is there airflow from any vents (defrost, vent,
lower) Is this the automatic or manual a/c system? Any more info will be helpful for me to
assist you.
VISITOR:
Thanks for your quick response.
There is air flow from the defrost, lower and the back air vents. The dash vents seem to be
the only area without airflow. Not sure what you mean by "the automatic or manual a/c".
Sorry.
Thanks.
JK:
The automatic system controls air temp and delivery automatically, the manual system you
must control yourself. Sounds like you have a problem with the mode actuator. Sometimes
this happens after a battery is replaced, or after trying to jump start. Fist thing to do that
usually works is perform a reset and calibration of the mode doors and control head.
With the key off, remove the HVAC B, and the HCAV 1 fuses from the rear fuse block under
the second row seats. Wait for at least 1 minute. Re-install fuses, start truck and do not
touch a/c control head for 2 minutes. Shut off truck, re-start and check for normal operation.
V8
Battery replacement
work done to repair = None
tech = JK
question = After having the battery replaced the dash vents will no
longer blow air.
JK:
I will need a little more info to be of some help. Is there airflow from any vents (defrost, vent,
lower) Is this the automatic or manual a/c system? Any more info will be helpful for me to
assist you.
VISITOR:
Thanks for your quick response.
There is air flow from the defrost, lower and the back air vents. The dash vents seem to be
the only area without airflow. Not sure what you mean by "the automatic or manual a/c".
Sorry.
Thanks.
JK:
The automatic system controls air temp and delivery automatically, the manual system you
must control yourself. Sounds like you have a problem with the mode actuator. Sometimes
this happens after a battery is replaced, or after trying to jump start. Fist thing to do that
usually works is perform a reset and calibration of the mode doors and control head.
With the key off, remove the HVAC B, and the HCAV 1 fuses from the rear fuse block under
the second row seats. Wait for at least 1 minute. Re-install fuses, start truck and do not
touch a/c control head for 2 minutes. Shut off truck, re-start and check for normal operation.
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A few other Chevy questions.
2003 Chevy Trailblazer 4.2
Warning lights = ABS
Checked codes, none. Took of wheels and brakes and rotors looked fine. Replaced hub of one wheel a few
months ago, not same noise as before though.
Question = I few weeks ago, my ABS light went on. Then about a week after that I started getting what
sounded like a scratching noise ( I thought was brakes but wasn't). Starting last night, I turned left and it
sounded and felt like my axle was broke or something, horrible thumping noise. It stopped after a few
minutes, so drove a little more and about an hour later it started thumping again.
Warning lights = ABS
Checked codes, none. Took of wheels and brakes and rotors looked fine. Replaced hub of one wheel a few
months ago, not same noise as before though.
Question = I few weeks ago, my ABS light went on. Then about a week after that I started getting what
sounded like a scratching noise ( I thought was brakes but wasn't). Starting last night, I turned left and it
sounded and felt like my axle was broke or something, horrible thumping noise. It stopped after a few
minutes, so drove a little more and about an hour later it started thumping again.
Answer: If the ABS light is on, then you do have codes stored in the
computer. You may not have a scanner that is capable of reading ABS
codes, and that's why it shows no codes. The noise you describe is
probably another hub bearing. And most likely, that's the reason for
the ABS light. You may want to get it checked out by a professional or
someone that has a proper scanner. Sometimes hubs do go bad
without setting a code too, so it's possible you have a couple different
problems. Since the brakes are fine, you can look a little deeper by
turning each wheel independently while you have it jacked up and
listen for noise and also check for looseness of the hubs and
suspension components and axles. Definitely needs some looking at.
computer. You may not have a scanner that is capable of reading ABS
codes, and that's why it shows no codes. The noise you describe is
probably another hub bearing. And most likely, that's the reason for
the ABS light. You may want to get it checked out by a professional or
someone that has a proper scanner. Sometimes hubs do go bad
without setting a code too, so it's possible you have a couple different
problems. Since the brakes are fine, you can look a little deeper by
turning each wheel independently while you have it jacked up and
listen for noise and also check for looseness of the hubs and
suspension components and axles. Definitely needs some looking at.
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