A/C, low pressure port location

Tiny
RYANS0725
  • MEMBER
  • 2008 CHEVROLET COBALT
  • 2.4L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 146,000 MILES
I bought the kit to recharge my A/C unit but I cannot seem to locate the low pressure port.
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Sunday, August 2nd, 2015 AT 11:42 AM

12 Replies

Tiny
WRENCHTECH
  • EXPERT
Hello,

Here is a guide and a video to show you where the low side port is:

https://youtu.be/ON2dYcmXIAw

and

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

Please let us know if you need anything else to get the problem fixed.

Cheers
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Sunday, August 2nd, 2015 AT 1:42 PM
Tiny
SAMMS21
  • MEMBER
  • 2007 CHEVROLET COBALT
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 92,000 MILES
Should I add the oil and the refrigerant to the low pressure valve and does it matter which goes in first
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Thursday, August 9th, 2018 AT 5:29 PM (Merged)
Tiny
SAMMS21
  • MEMBER
  • 2007 CHEVROLET COBALT
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 92,000 MILES
I recently replaced a cracked A/C refrigerant hose on my car, I am pretty sure all the refrigerant leaked out. I know how to recharge the system but I am not sure if I should add oil charge with the refrigerant. Any advice is greatly appreciated. Thank you!
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Thursday, August 9th, 2018 AT 5:29 PM (Merged)
Tiny
SATURNTECH9
  • EXPERT
If you lost a hose I would put about 2ozs of oil in with the charge.
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Thursday, August 9th, 2018 AT 5:29 PM (Merged)
Tiny
SAMMS21
  • MEMBER
Should I add the oil first? And does it go into the low pressure valve also?
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Thursday, August 9th, 2018 AT 5:29 PM (Merged)
Tiny
SATURNTECH9
  • EXPERT
You always charge at the low side. Just get a can that has oil and some charge in it to get the system start with the oil charge first.
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Thursday, August 9th, 2018 AT 5:29 PM (Merged)
Tiny
MICHAELCHARLES992
  • MEMBER
  • 2006 CHEVROLET COBALT
  • 100 MILES
Replaced compressor, condenser, dryer, and expansion valve. System holds 14.5 ounces. Pulled a vacuum, recharged with correct amount, pressures are 30 low side about 160 high side. Liquid line up to condenser is hot but condenser and liquid line to expansion valve remains cool to the touch. Suction line from expansion valve to compressor also room temperature. I am a mechanic for thirty years this one has me stumped. I thought a restriction in the condenser which is why I changed it. This car has the condenser and dryer as one assembly. Temperature at vent is about 80 degrees.
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Thursday, August 9th, 2018 AT 5:29 PM (Merged)
Tiny
RIVERMIKERAT
  • MEMBER
Check the air bleed/blend doors. My bet is one of the doors is not opening to channel the air across the evaporator coil.
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Thursday, August 9th, 2018 AT 5:29 PM (Merged)
Tiny
CHEVYCOB
  • MEMBER
  • 2007 CHEVROLET COBALT
  • 120,000 MILES
I notice a few days ago that the center vent blows significantly less heat (airflow) than it has in the past. Most has diverted to the outside set of vents on the instrument panel. The upper and lower vents seems to be getting the right amount of airflow if they are selected. It is just the center vent does not seem to be blowing much heat (airflow).

I did notice a sound from under the dash about the same time I notice this airflow problem. It seemed like a sound of a flap snapping shut that would divert the airflow to the center vents properly.

Is there anything that is typical on this vehicle I could check? I am still trying to figure out how to get the climate control system loosened from the dash to take a look inside without tearing everything apart to do it.

Thanks for any help you can give me.
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Thursday, August 9th, 2018 AT 5:29 PM (Merged)
Tiny
SATURNTECH9
  • EXPERT
The first thing I would check is the cabin air filter see if it is clogged up.
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Thursday, August 9th, 2018 AT 5:29 PM (Merged)
Tiny
BENITA WARD
  • MEMBER
  • 2006 CHEVROLET COBALT
  • 86,000 MILES
The AC gets cold on the highway (not very cold) but in town it is up and down. It will go cold then hot then cold then hot constantly. Could this be a loose belt? And when I say not very cold I mean not very. Last summer it was very cold. Now it just gets cool.
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Thursday, August 9th, 2018 AT 5:30 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Check to make sure the belt is tight. Also, it could be getting low on Freon. Have that checked. Finally, there are many other issues that can cause this. The most common is the cycle switch that engages the compressor for specific lengths of time. If it is kicking on and off due to a bad switch, the temperature will change often.
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Thursday, August 9th, 2018 AT 5:30 PM (Merged)

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