Need to recharge the ac coolant. Bought can with gauge but which black cap do I remove to use the fill? AC is on passenger side back by firewall, cylindrical shapped object, in an upright postition, with black cap on side of top or on silver line to the right and toward the front but coming off this cylinder, CORRECT?
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Re: Need to recharge the ac coolant. Bought can with
It will not hurt anything if you attempt the pressure side.The vacuum side should be on the left if you're standing in front of the car with the hood open.You want the car running and a/c on.You should be able to hear it "taking".Good luck.
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Most likely your system just needs to be charged with r134a coolant. You can do it yourself. Just head down to the local auto parts store and buy a can of coolant that comes with a hose and gauge attached and then locate you low pressure port on you system. It is typically located on the passenger side between the radiator and the firewall on a silver tube. Don't worry you can't make a mistake as the coupler will only fit the low pressure side. When you locate it remove the cap and hook up gauge and can. Start the car and turn the AC to mac cold and highest fan speed. Then open the gauge depending on ambient temperature out side your gauge should read between 35-45 psi. The gauge should also be color coordinated as long as you don't fill until the gauge is in the red. Your good. Then close the gauge, remove it from the low pressure port and replace the cap on the port. (When the coolant is flowing into your system the can should turn quite cold and maybe even have some frost on it. No worries that is normal).
The coolant used in ACs has very small molecules and no system remains tight enough to prevent loss. You probably only need to recharge it if it has not been opened.
You can buy a kit with pressure gauge, coolant, connection hoses and instructions for <$25 US in auto parts stores. Make sure though that your system uses R134 coolant (especially if it is older) otherwise you may need a conversion kit to install first.
check the coolant in the radiator. Once the car is up to temp (engine running), squeeze the top radiator hose, if it is cold, then you have an airlock. Let the engine cool, remove radiator cap and run the engine for 20 minutes, topping up the coolant when it lowers.
The AC might need recharged at the same time with Freon.
#1) First determine where the Leak is Located Use a Leak detector from your Local Parts Store.
#2) The Leak could be a A/C High or Low Presure Line.or could be a Rubber O-Ring Mainly Where your Lines are Conected to the A/C Compressor.
#3) Anytime a A/C System Has a Leak ,Fix the Leak 1st then you Need to Evacute the System By using a Vacum Tool.
#4) You probely don't have this-Almost any Repair Shop has the Right Equiptment.
#5) Assuming th Leak has been found and Repaired and the System Vacumed Down.
#6) To Recharge your System if your doing this.You'll need to buy R-34 Make Sure it Has a Gauge on it.Also Your A/C System wil need to Have The Refrigent Rechare NOTE: also it will need Oil put ack into the System.
#7) You Can buy the R-34 With the Oil in the Same Rechagre Can=With Gauge.
#8) Locate your Low Side Line Look at the Lines Coming from the Firewall and Trace the Lines and You Will see a Plastic Cap With a (L) on it This is your Low Sideor (suction side)
#9) Remove the Cap you'll see what looks like a Valve Core to Air your Tires up.
#10 Start your Enging Turn your A/C on High or Maximum Cool and the Fan on High. The R-34 has a Quick Connect on the Hose ,JUst pull it back nwhile Putting it on your Low Side Recharge Valve.Be Sure you Shake the Can before connecting it.
#11) After Connected Turn Can Upside Down Shaking it as The System is Recharging.
#12) Watch the Gauge on the R-34 Don't Over fill it,Stay with in The Green on the Gauge.
#13) Remove connector from the Coolant Line and You Should Have Cold Air Providing everything else on your A/C System is Working Properly>
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YOU NEED A R-134 GAUGE SET TO CHECK LOW PRESSURE SIDE AND HIGH PRESSURE SIDE.YOU ALSO CAN BUY A LITTLE CHEAPER GAUGE TO CHECK YOUR AC LOW BLUE SIDE AND HIGH RED SIDE AT ANY AUTO ZONE OR ADVANCE AUTO PARTS.WHAT YOU DO WHEN YOU GET YOUR GAUGE SET HOOK GAUGE TO LOW PRESSURE SIDE BLUE CAP PORT AND GAUGE TO HIGH SIDE PRESSURE RED CAP PORT.YOU CRANK CAR UP GET IT OPERATING TEMPERATURE.THEN TURN AC ON HIGH COOL LET RUN 3 TO 4 MINUTES.CHECK LOW SIDE GAUGE READING SHOULD BE 28 - 32 PSI. HIGH PRESSURE SIDE GAUGE SHOULD 199 - 228 PSI. THATS NORMAL CHARGE. SEE YOU CANT JUST RECHARGE AC SYSTEM UNTIL YOU CHECK IT FIRST YOU WILL DAMAGE SYSTEM .NOW YOU CAN GO TO AUTO ZONE PARTS BUY A CHARGE CAN WITH GAUGE AND HOSE.ATTACH TO IT.YOU NEED MORE THAN ONE CAN.WARNING MAKE COMPRESSOR IS RUNNING WHEN YOU TURN ON AC .BECAUSE IF COMPRESSOR NOT RUNNING CHECK FUSE AND AC COMPRESSOR RELAY.IF BOTH OKAY.YOU COULD HAVE OPEN CLUTCH COIL A FAULTY LOW PRESSURE SWITCH WILL CAUSE AC NOT TO WORK. IF LOW PRESSURE GAUGE BLUE SIDE PRESSURE IS 28 OR 30 YOU DONT NEED A CHARGE.PROBLEM SOME WHERE ELSE.BE SURE TO WEAR SAFETY GLASSES WHEN WORKING ON AC SYSTEM.
You'll need to find the hi-side fitting, it will be in the some diameter line coming out of the compressor, usually will have a red or black cap. Auto Zone sells recharge kit. Get the one with the gauge so you can see what the pressure is. You don't want to overfill it.
You can only attach the the recharge hose from the kit to the low side ( A/C service port) and the cap should be blue with a leter L on it. Good luck and follow the instruction and don't over charge the system. With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold - STOP don’t overcharge the system. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system. And actually the best way to insure the proper charge is in a system, is to use an AC machine to recover the R134a and then evacuate and recharge the system with the correct amount. Most cars have the specified amount on a decal under the hood. Good luck and hope this helps.
the smaller cap, is where it is refilled at, that is the low side, the container will only fit on one of the openings, if fluid or air sound happens and doesnt stop for the neck on the ac recharge bottle then you are not on the right spot. but normally the caps are set as black and blue, but look for the smaller cap, if they dont look different before you do anything remove the caps, put the openings on the caps back to back to each other and look close you will see a difference in the cap size... the smaller is where you need to conect the recharger up to... my guess would be the cap by the cylinder is the smaller... I dont know unless I could see it... hope this helps...