High pressure in the air condition system on the low side port. Went to recharge the system on a 2002 Pontiac Sunfire as it's not very cold when the air condition is on.
Intial pressure on the low side was very high. In the red on the gage provided by Duracool. So...I opened the vavle and empitied the system of the existing agent.
This A/C system can hold 1.5 lbs of R-134a and I only put 1 can of 17 ounces in when the gage went into the red immediately. I opened the valve and release more R-134a until the pressure was acceptable.
I added a leak fix and lubricant to the system and again it went into the red.
I opened the valve and released more gas until the pressure was acceptable.
Meanwhile, during this entire process I had a Temp. gage inserted into a vent. The temp would not go below 70 F. Later on when I took the vehicle for a drive, the temp would not go below 90F...it actually got warmer!?!?!?
Reading online, I think I might need to replace the compressor.
What else should I be looking at?
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Re: Air Condition not very cold.
The pressure on the low side it not very meaningful by itself. What matters is the difference between the high and low. The low normally can be up to 120 psi or so, and the high side can be twice that. But when the AC is running, the low side should drop to less than when it is off. But there could be lots of reasons for it not being very cold. The pump clutch could be failing to engage. The release valve should be not opening. The air flaps could be letting heater air in instead of cold. The AC condenser fan fan or relay could be bad. Etc.
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1Start the recharging process with any left over freon you may still have. Open the Civic's hood and attach the kit to the Civic's low side port. Then, set the kit onto a place in the engine compartment where nothing can move or shift once the engine has been cranked.
2Start the Civic and let the engine run until it reaches its normal operational temperature.
Single Pressure Gauges for Indl., Commercial & Specialty Uses
3Turn on the airconditioning to its coldest and hardest-blowing settings. Place a thermometer into one of the Civic's air conditioning vents and monitor how the temperature drops. Once the air conditioning's temperature reaches a level, constant degree, remove the thermometer.
4Open all four doors on the Civic. This will allow any colder air generated to escape, and this will keep the Civic's air conditioning for accidentally cycling off while you recharge the refrigerant levels.
5Turn the recharging kit's valve all the way down and let the refrigerant charge into the Civic's air conditioning periodically, shut the valve and look at the kit's gauge. This will allow you to monitor the recharging process. Allow at least one minute to elapse between refrigerant charges into the system.
6Shut the valve of the canister, once it has become depleted. Disconnect the kit from the low side port.
7Detach the hose, gauge, and valve from the empty canister and attach them to a new canister of refrigerant. Reattach the kit's hose to the Civic's low side port and continue recharging the system, allowing a minute between individual charges. The can itself can potentially grow very cold and hard to hold, even with gloves. Should this happen, wrap the can in a towel warmed in water. Ring out excess water before wrapping the canister.
8Place you thermometer into one of the Civic's air conditioning ducts. Keep an eye on the falling temperature within the Civic's air conditioning system. The system is charged when the temperature hits 40 degrees. Also, within the engine compartment, the Civic's air conditioning aluminum tubing become uniformly cold.
9Shut the recharging kit's valve and remove the kit from the low side port, once the system has been successfully recharged. Shut down the Civic's air conditioning, turn the engine off, and remove your key from the Civic's ignition. Also, shut all the doors
Replacing the heater core in a Pontiac Sunfire is a very difficult and complex process. The heater core is kept within the car's heating/air conditioning module behind the instrument panel. So many other parts have to be drained and removed from the car
to reach the heating/air conditioning unit that you may be better off
leaving this to a professional mechanic--especially one licensed to work
on air conditioning units. Things You'll Need:
Air conditioning reclaimer
Hose clamp pliers
Recharge service hose
Removing the Core
Make sure the car is cool, the front wheels are facing
forward and the ignition switch is off. Drain the engine coolant by
removing the drain plug at the radiator and letting the coolant pour
into a clean container, then do the same at the engine block's drain
plug. Recover the refrigerant by connecting an air conditioning
reclaimer to the system high and low side fittings as its instructions
Disconnect the evaporator lines to the evaporator by
removing its bolt and disconnect the heater hoses from the core by
loosening the hose clamps with clamp pliers. Remove the drain tube from
the evaporator case. Disconnect the negative battery cable.
Remove all the trim covers and panels from the
instrument panel; some of these are screwed on and some require a flat
bladed tool. Remove all air distribution ducts from the panel, the air
bags, the steering wheel, the radio, the tilt and washer levers and all
electrical connectors, then unscrew and remove the instrument panel from
the car. Unbolt the cross vehicle beam, remove its wiring harness and remove the beam.
Remove the air outlet in the floor. Disconnect the
wiring harness for the heater/air conditioner and the electrical
connectors at the blower's motor and resistor.
Remove the heater/air conditioning module by removing
its attaching bolts and the assembly screw. Remove the heater cover case
by removing its heat stakes and screws and remove the heater core.
Install the replacement core into the heater/air
conditioner module, then re-connect the heater core cover case. Install
the assembly in the vehicle,
aligning the mounting bracket to the front of the dash slot and
mounting bolt hole. Reconnect the electrical connectors and wiring
harness and install the floor air outlet.
Reinstall the cross vehicle beam and every component of the instrument panel. Reconnect the negative battery cable.
Install the drain tube back on the evaporator case. Connect the hater hoses and the evaporator lines.
Recharge the air conditioner. Connect a can of R134a
refrigerant to the air conditioner's low side service fitting with a
recharge service hose and a high pressure gauge to the high side
fitting. Open the service hose valve while the car runs with the A/C at
the max and let the vapor flow until the gauge reads between 225 and 250
Refill the cooling system at the radiator filler neck. Use fresh coolant if the old liquid is dirty in any way
Hi, determine if your car uses R134 or R12 refrigerant. You will notice screw type connectors on the both the High Pressure Side and Low Pressure Side lines in models using R12 refrigerant. R134 compatible models have quick connect valves on both sides. Models made before 1995 may use the old R12 refrigerant. If this is the case, you must have your Chrysler's air conditioning system retrofitted to use R134 refrigerant. Mixing R12 and R134 refrigerants is dangerous and may cause damage to your vehicle.
Check your air conditioning system pressure using an automotive air conditioning pressure gauge. Keep in mind that in order to get an accurate reading, the air conditioner has be turned on the coldest setting with maximum blowing power.
Remove the Low Pressure Side port valve cap and set it aside. The location of the port varies, but it is usually in front of the engine block. Attach the refill hose to the port on the Low Pressure Side of the air conditioning system. The Low Pressure Side port is smaller the High Pressure Side port. Because the ports are different sizes, the refill kit hose should fit only on the Low Pressure Side port. Additionally, the High Pressure Side port will usually have a red cap or be marked with an H or the word High
Allow the air conditioner to **** the refrigerant out of the can by slowly turning the valve on the refill kit hose. Pay attention to the way you hold the can. Most kits will have you hold the can upright when you recharge the air conditioning system. It may take as long as 10 minutes to empty a single can.
Turn the valve to the off position and remove the refill hose from the port. Recap the port before closing the hood.
Let the air conditioner stay on for at least 30 minutes. This allows the refrigerant to move throughout the entire system.
mcdevito75 here, I think your speaking of the air conditioning, it is charged from the low side, if the compressor will not come on you"ll most likely need freon, the compressoe must be on to check it"s operation.
Go to your local auto parts purchase a a/c charge kit for about $69.00, find the low pressure(suction) fill port, there are two ports in every a/c system one is a low pressure side used primarily to fill a system with freon 123a or the like and it is the larger valve mounted on the line, then there is the dangerous high side valve, this is a smaller diameter valve mounted to a smaller diamet a/c line, this is under extreme pressure so donot attempt to fill this high side with freon as it can backfire on you and cause injury.
The low side fill kit will not fit on the high side port so thank godness for that.
start the vehicle put the a/c on full cold high blow fan speed, start filling the low side with a can of 123a freon+oil additive, which equals one pound of freon and check the inside a/c vents, getting cold? If its perfect then you are done, the system may have a very small slow leak and if it only takes a one pound can to fill it once or twice a year you are ok, if it takes more you may want to add a second pound can of freon 134a containing a dye additive that will work its way into the system and show you where the leaks are by exposing a color once it hits the air coming out of the systems defective seals etc.,also they sell a sealer + freon one pound can that can be used to try to fix the leak without having to get too expensive on the repairs.
A car's air conditioning system only hold like 2 3/4 pounds of freon, so in the event you happen to over fill the system a high pressure blow valve usually mounted on the a/c compressor will purge off the excess, but let me warn you they blow off without any warning and can startle you. Always think safety first, wear protective equipment. Work Smart, Work Safe.
You may have created an over charged condition and at this point the a/c compressor will cut off on high head pressures. This can be verified by installing gauges to the systems high and low side service taps and reading the pressures.An overcharged system will start the compressor briefly but soon cuts off once pressure goes to 350 - 400 lbs on the high side. Acceptable pressures for this system should be no greater than 250 high and low suction should drop to 40-50 psi.You might recover the charge and evacuate the system,then try bringing the charge back to proper level.A sight glass in the reciever drier really helps determining proper fill.Once all bubbles have dissipated from the sight glass during charging ,one should stop at that point to avoid overfilling.Too much freon is worse than a low charge especially in hot ambient conditions....