Question about 2007 Chevrolet Cobalt Coupe

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My A/C is pretty warm even when i switch it to the cold side. I tried putting Freon in it but im having trouble find the low-pressure service port. Last time my dad tried putting it in (without me knowing) the right side of my car made a scratchy noise and on the bottom, it started to leak coolant. Please help!!

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Locate the Low Pressure Side port quick connect valve. You can find this under the hood of the car. It is near the air conditioner evaporator toward the front of the engine. The Low Pressure Side port will have a cap marked L or Low. Remove the cap and put it in a safe place.
Connect the refill hose to the connector on the Low Pressure Side of the air conditioning system to add R134 refrigerant. The Low Pressure Side connector will be larger than the High Pressure Side connector will so the refill hose will fit properly only on the Low Pressure Side.

Open the valve slowly on the refill hose to allow the Freon to enter the air conditioning system. In most cases, you will have to hold the can upright. You may need to add more than one can of refrigerant.
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Jul 08, 2010


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Freon was low, the clutch would not stay in very long while trying to add the freon, I continued to put the freon in at a slow pace,after about 18 oz. the clutch did kick in and stayed in through out the...

Sounds like the freon was pretty low.The pressure readings are pretty low indicating possibly a weak compressor or freon is still low. Does this have rear ac as well?l You probably should have evacutated the system and put it into a vacuum. A very useful tool would be to inject a uv dye oil charge into the system and let it run with the ac still cycling which can still be done prior to evacuation.If there any leaks present the dye will seep out the leak and be easily detectable with a uv light.

Jun 14, 2011 | 1997 Chevrolet Suburban

1 Answer

AC won't cool, clutch continuosly snaps on and off.

The first step is : check if the car is lower in freon.
because when the system is low . the cycling switch turn off the compressor when the pressure goes lower that 25 psi.
Get a Can of freon and charge for the LOW side service port.

But if you note that the system is full on freon.
make a BY PASS on the CYCLING Switch.
Is located on the Filter dryer.( acunmulator)
and see if the a/c is cold enought.

OK.. I hope this help on your problem...

Jul 26, 2008 | Ford F-350 Cars & Trucks

1 Answer

I have a chevy venture 1998. I put freon 134a in the low valve near the radiator in the front of the van. It blows cold air in the back of the van but not in the front. Is there another valve to put freon...

No ,there is not another valve . One low side service port an one high side service port . An only one A/C compressor . Under the hood in the engine compartment there are A/C lines going into the firewall . These go to the front Evaparator unit . With the vehicle running an A/C on do this line's (pipes) get cold ? If yes , your problem is probably the temp. actuator . Control's how hot or cold the air coming from the vent's get . If stuck half way , hot an cold air combine to make warm air . Replacing some of these actuators can require the dash to be removed . Your best bet ,take it to a qualified repair shop .

Oct 25, 2017 | 1999 Chevrolet Venture

1 Answer

My air condition is not blowing cold air

best diagnostic method is dual head gauges. balanced pressure between low and high side in the off position is aroung 90 lbs. running low pressure is 20-40 lbs and high pressure 160-200, is the compressior not coming on? does it stay on, or click on and off. either might mean the freon level is low. try unplugging the low pressure switch on the low side supply line and shorting the pigtail wires together with a paper clip. does the compressor stay on now? if so and the air is warm or cool, freon is low. if the air is cold that switch is bad. if compressor still won't come on the list of possibilities grows longer: compressor, comp fan clutch, AC relay, restriction at several places... repair shop time...

Sep 04, 2010 | 1991 Buick Riviera

2 Answers

Im looking for the low pressure port on a 96 ford taurus ?????

Oh, that's an easy one. The low pressure side is made up of larger diameter tubing than the high pressure side (aluminum tubing) that holds the refrigerant.

Also, the low pressure side always gets cold when working properly with the a/c on. The cold low pressure side piping will develop condensation on a hot day.

Sometimes the low pressure port is located on a post that sticks up and has a blue or black cap on it, similar to schrader valve but different.

The quick connector connects to the hose found in an r134a kit that may have a 12 oz. can of r134a for bumping up the amount of freon in your system (sometimes cars leak this gas slowly through o-rings).

Good luck to you on this.

Jul 09, 2010 | 1996 Ford Taurus

2 Answers


sounds like the a/c is not fully charged, have the system serviced by pulling the freon out and pull a vaccum on the system and recharging with proper amount of freon. this should fix the problem. if when fully charged and this happens either the high pressure switch or low pressure switch could be bad.

Aug 24, 2009 | 2000 Acura TL

2 Answers

After approx 40 min of highway driving the AC stops blowing cold

The frosting of the line is normal. Did you use a gauge set when charging the unit? AND, most important, Did you evacuate the system before putting in the freon? Very important.What was your final low side reading and your final high side reading?

Jun 02, 2009 | 2003 Hyundai Santa Fe

2 Answers

Looking for low pressure port for servicing Freon in A/C system for 1998 Chevrolet Suburban. There are 2 ports on top of compressor. Which is the low side and which is the high side?

The ports on my 2005 silverado are on the same line,which is very confusing but, in between the two ports is the metering device (orifice) which changes the high pressure gas into a low pressure gas.The two ports are of a different size,with the low pressure being the smaller of the two. You can put your hand on the line, on each side of the metering device connection and the high side will be hot and the low side will be cold

Apr 19, 2009 | Chevrolet Suburban 1500 Cars & Trucks

2 Answers

2000 buick lesabre 3800 has warm air blowing out two driver side vents in A/C mode, but the two passenger side vents are blowing cold. any suggestions?

I had same problem on 2000 Lesabre blowing cold on passenger and warm on driver. I fixed it by adding more freon even though it had 28 pounds of preasure. Now it works great!

Jul 30, 2008 | 2001 Buick LeSabre

1 Answer

Need to add Freon

There are two A/C service ports located somewhere in the system, one on the high side (larger port) and one on the low side (smaller port)

They are located in different areas depending on the vehicle, and there is no general location I can give you.

Start from the compressor (belt driven on the engine) and follow your lines, they should be somewhere on the A/C lines or accumulator/dryer (big aluminum canister near the firewall) and are (usually, if they were not left off) capped. Twist the caps off and inside is a "Schrader-type" valve (like the valves on tires). These are the service ports.

Just for reference, there are 2 different sizes of A/C lines on any vehicle, the small ones are the high pressure side (liquid side)(lines which get hot during operation) and the larger ones are low pressure side (vapor side) (lines which get cold during operation).

The system runs a small line from the compressor (on the engine) to the condensor (in front of the radiator), a small line from the condensor, through the orifice tube to the evaporator (inside the cab heater box) then a larger line out of the evaporator, through the accumulator/dryer, back to the compressor.

Jun 21, 2008 | 2002 Suzuki Vitara

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