The liquid line has a built in orifice tube. It would surprise me that high suction pressure would cause pinhole leaks in the lines.
They are usually built to handle many times more pressure than the normal operating pressure. However, there are a few things that cause high suction pressures: 1 high load on evaporator, 2 too much refrigerant, 3 large amount of non-condensables in refrigerant and 4 bad compressor. It is normal for suction pressure to be higher when the system is first started and get lower as the cabin temperature get's lower.
Most auto AC systems are charge by refirgerant weight, not by pressure. Incorrect charging of the system can lead to high suction and discharge pressure. Non-condensables in the AC system is caused by improper evacuation.
The valves in the compressor will sometimes leak allowing high pressure gas back into the suction line. Thread Tools. BB code is On. Smilies are On. Trackbacks are On. Pingbacks are On. Refbacks are On. Forum Rules. All times are GMT It should be possible to simply pull the tube out of the evaporator through the hole in the evaporator case.
Step 3: Replace the O-rings. Whenever an air conditioning line is disconnected, the O rings should be replaced with new ones. O-rings should be soaked in the appropriate refrigerant oil before use. Just put some oil in a small dish and throw all your O-rings in it before you start disconnecting the valve, and they will be ready for use by the time you need them. Slip them carefully onto the disconnected lines.
Step 4 Reconnect the expansion valve. Carefully re-connect the lines to the expansion valve and install the fasteners. Gently push the capillary tube back into the evaporator case through the hole where it came out. It should be a straight shot. If your system uses an orifice tube instead of an expansion valve, most of the procedures are nearly the same, the difference is that the orifice tube is located Inside the line going to the evaporator. Step 1: Locate the orifice tube. The orifice tube will be inside the high-pressure line to the evaporator.
Most orifice tube systems have the evaporator under the hood or cowl, Find where the line steps up in size just before a joint. The orifice tube should be in there. Step 2: Open the line. Once you break the connection, you should see a plastic tab inside the line. The extraction tool can be inserted into the pipe, and by turning it will engage tabs on the orifice tube that are present to enable removal.
Notice if the screen is damaged or clogged with debris. If so, there may be damage elsewhere in the system. Smear some refrigerant oil on the o rings and insert the new orifice tube into the line. The new orifice tube should have an arrow on it that should go in pointing toward the evaporator. Put new O rings on the line and re-connect the line. Recharging the AC system is a procedure best left to trained personnel. It requires specialized equipment and the performance of the system can vary widely depending on weather it is done correctly.
Installing exactly the right amount of refrigerant and oil is critical which can only be done with the proper equipment. Additionally, in some states you have to be a certified technician in order to buy refrigerant. For those reasons, it is strongly recommended that you have a professional recharge the system. This article originally appeared on YourMechanic. Autoblog is partnering with YourMechanic to bring many of the repair and maintenance services you need right to you.
It should be possible to simply pull the tube out of the evaporator through the hole in the evaporator case. Step 3: Replace the O-rings. Whenever an air conditioning line is disconnected, the O rings should be replaced with new ones. O-rings should be soaked in the appropriate refrigerant oil before use.
Just put some oil in a small dish and throw all your O-rings in it before you start disconnecting the valve, and they will be ready for use by the time you need them.
Slip them carefully onto the disconnected lines. Step 4 Reconnect the expansion valve. Carefully re-connect the lines to the expansion valve and install the fasteners. Gently push the capillary tube back into the evaporator case through the hole where it came out. It should be a straight shot. If your system uses an orifice tube instead of an expansion valve, most of the procedures are nearly the same, the difference is that the orifice tube is located Inside the line going to the evaporator.
Step 1: Locate the orifice tube. The orifice tube will be inside the high-pressure line to the evaporator. Most orifice tube systems have the evaporator under the hood or cowl, Find where the line steps up in size just before a joint. The orifice tube should be in there. Step 2: Open the line. Once you break the connection, you should see a plastic tab inside the line.
The extraction tool can be inserted into the pipe, and by turning it will engage tabs on the orifice tube that are present to enable removal. Notice if the screen is damaged or clogged with debris. If so, there may be damage elsewhere in the system. Smear some refrigerant oil on the o rings and insert the new orifice tube into the line. The new orifice tube should have an arrow on it that should go in pointing toward the evaporator.
Put new O rings on the line and re-connect the line. Recharging the AC system is a procedure best left to trained personnel. It requires specialized equipment and the performance of the system can vary widely depending on weather it is done correctly. Installing exactly the right amount of refrigerant and oil is critical which can only be done with the proper equipment.
Additionally, in some states you have to be a certified technician in order to buy refrigerant. For those reasons, it is strongly recommended that you have a professional recharge the system. The most popular service booked by readers of this article is Car AC Repair.
Our certified mobile mechanics perform over services, including diagnostics, brakes, oil changes, scheduled mileage maintenances, and will come to you with all necessary parts and tools. Our certified mobile mechanics make house calls in over 2, U. Fast, free online quotes for your car repair. Car AC Repair Cost. Service Location.
This is important for two reasons: One, because recovering contaminated refrigerant will not only damage the equipment, it will spread the damage like a virus to every car that is later hooked up to that equipment.
Part 3 of 4: Replace an orifice tube If your system uses an orifice tube instead of an expansion valve, most of the procedures are nearly the same, the difference is that the orifice tube is located Inside the line going to the evaporator.
Home Car AC Repair. The statements expressed above are only for informational purposes and should be independently verified.
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