Problem with my 2004 CHEVY TRAILBLAZER
Inline 6 cyl. 4200
question = I just WANNA KNOW WHERE THE EXACT LOCATION OF THE A/C LOW  
PRESSURE REFILL LINE IS TO ADD MORE R134 FREON IN.  

IS IT NEAR THE FIRE WALL OR RADIATOR SUPPORT?

DOES IT HAVE A BLUE OR BLACK CAP?

THIS IS MY GF'S CAR BUT SHES IN ANOTHER STATE RIGHT NOW WITH THE CAR  
SO THIS IS WHY I'm ASKING SO I CAN HELP HER FIND IT.
JK:
The low pressure A/C freon port is on the accumulator.
The accumulator is the aluminum cylinder looking part under the hood on
the passenger side, near the firewall.
My 2001 Chevy Venture van a/c Blows Warm
The air conditioner is blowing warm air. I need to know where the high and low side
pressure service fittings are so that I can add freon
Grand Am No Heat from Vent Antifreeze Not Low or Overheating
The gauge on the dash works.
The engine gets hot, and the car has not over heated. Is my problem...
The primary function of the heater and A/C system, also know as HVAC,
is to provide air temperature comfort inside your car or truck.
All system have mainly the same components:

Compressor
Evaporator Core
Condenser
Freon, Hoses and Lines
Control Head
Heater Core
Temperature / Mode doors
and a number of other hoses, lines, fittings, valves, motors or actuators and sensors.

All of todays newer cars and trucks are electronically controlled by the control head.
This is the panel in the dash that you use to change all functions.
This panel sends signals to the temperature and mode door motors / actuators to
direct air flow and change the temperature of the incoming air. Signals to the
Powertrain Control Module (PCM), or Body Control Module (BCM), and then to the
compressor to turn it on if all parameters are met. These parameters include many
different things such as outside temp, engine temp, throttle position, engine speed,
and many others. Any one of these things can prevent A/C compressor engagement.
My 2006 Chevrolet Equinox Vents Only Blow Hot
I cannot change the heater A/C vents from warm to cold on my Equinox. Will change
from vent to floor and defrost. Is it temperature door motor that i can repair myself...
See Pictures Here