Chevy 2003 Trail Blazer ls
question = When i turn on my a/c and let it idle the rpm dips way below 1 and almost shuts off until i
rev it up again but if i let it sit there it shuts off, it does the same thing when i turn on the heat, other
than that the engine is fine, but only when the a/c and heat get turned on it starts to die, i just
changed out my battery as well so i have a new battery, also with that my power buttons on my
door don't work from time to time, and i wonder if they are related to each other.
Answer:
OK. This is a very common problem when there is
carbon in the throttle body bore and plate.
Suggest a good cleaning. The throttle body is the front top of engine that the air cleaner duct hooks
up to. Remove the duct, open the throttle blade, spray some carburetor or carbon cleaner from any
parts store all around the bore and plate. Then spray some on a rag- not a paper towel, and wipe
all around the bore and plate. Re-install duct and start the engine. It will run rough for a few second.
Rev it up a few times to "Clear it out". Then take for a short ride doing a few hard accelerations.
Shut truck off for 2-3 minutes, then start ans let idle. After this, the idle should be fine." The window
problem may be in the switch itself. If this is the problem, a new switch would need to be
programmed after replacement.


2004 Chevrolet Trailblazer cylinders.
Warning lights: service. Repairs for this problem = changed battery.
Question = I start the engine, when a turn the air conditioner on the rpm dips or the engine
shuts off. The idle don't stay normal.
Answer:
The problem you are experiencing is very normal for these vehicles. What is happening is that there is
an airflow restriction at the throttle body due to carbon build up. This occurs over the years as a result
of bad gasoline, hard driving, lack of maintenance, etc. What you need to do is remove the air ducting
to the throttle body and then with a good solvent based cleaner, clean the throttle body very good
including the throttle blade and all inside the throttle opening.

Most auto parts stores have a good cleaner for this purpose. You really have to get in there good and
clean extremely well to solve this issue. If you have compressed air, that be a help too in drying out the
throttle body after cleaning. Once it is clean, reinstall all the ducting, reconnect any sensors, etc, and
start the vehicle. If you got any cleaner inside the intake it will burn off almost immediately, but can
cause the vehicle to run rough for a minute. Once the vehicle has reached operating temperature,
take it for a short drive. This is required so that the computer can 'relearn' a new idle speed. After that,
you should be able to use your air conditioning, defroster, etc, without any problems at all.


2005 Chevy Trailblazer 4.2L
Repairs for this problem = air intake temperature sensor and throttle body clean.
Question = Tune up the truck replaced everything back i had to disconnect the resonator and connect it
back to reach spark plugs when i start it runs smoothly but when i turn on the ac rpms run low, engine
shakes, stalls, then powers up and stalls again then finally dies with the fan still blowing.  I took it to
check battery and alternator i got a diagnostic and no warnings popped out everything was good so no
idea what is wrong why does it die after i turn on the ac?
Answer:
It is stalling out when you turn the A/C on due to the engine not getting enough air when
the idle raises to compensate for the air compressor kicking on. This is almost always fixed
by cleaning the throttle body. If you already did this, you didn't do a good enough job. You
have to really get in there and clean around and behind the throttle plate. Any little carbon
left behind will still cause issues. You should take the air intake off again and re-clean the
throttle body really good with a product called 'brake clean'. After reassembly, start the
vehicle and rev it up to burn out any excess cleaner, and then take it for a drive. It will take
a little bit for the vehicle to re-learn the idle again, but it will be fixed after that.
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Chevy Trailblazer Dies Out With A/C On At Idle