Question-------------------------
Followup To
Question -
I need to know the location of the air conditioning orifice on a 1998 gmc jimmy so that I can replace it. as that is what I have been told is clogged . I bought one but do not know where it is located. thank you
tina
Answer -
OK, But before I reveal where the orfice tube is, Do you have the proper A/C equipment and the technical knowledge to:
1. Do you have the necessary equipment and technical knowledge in order to SAFELY discharge the A/C system ?.
yes i have the necessary tools to do the task but not all the technical knoledge. no i don't know how to flush the system we purchued the truck from a used car lot it has losted two used compressors . now it is down again and i don't think the tube was ever changed thanks for your time and help.
2. You will need a vacuum pump to extract all of the atmospheric air that will get into the A/C system when you replace the tube ?.
3. Do you know how to FLUSH the A/C system of debris that is restricting your orfice tube ?.
4. Most orfice tube restrictions are caused by internal A/C compressor failure and in most cases the A/C compressor will need to be replaced.
Since You did not give much of a question and I have no way of determining your technical expertise I felt this these questions should be asked before you tackle this repair.
The orfice tube is usually located near the receiver/dryer (accumulator). Look for a metal to metal fitting on the small tubing of the metal A/C lines. There you will see 2 small dimples in the small metal line real close to the metal to metal fitting.
If you can't find it and have the ability to e-mail pictures, I can mark and e-mail back the pictures to you.
send your pictures to me at:
meperganfortis@msn.com
Let me know.
autohelp
AnswerNEVER,EVER put a USED A/C compressor on a vehicle unless you absolutely know if the vehicle that it is coming out of still had the system intact (the system is still full of freon) as when the A/C system is discharged and let open to atmospheric air, The refrigerant is highly susceptible to absorbing moisture from the air of which contaminates the refrigerant oil.
Since mso of the compressors are comprised of mostly made aluminum internal components they do not have any internal replacement components and are subsequently replaced vs being repaired.
Many people make the mistake of NOT pouring out the refrigerant oil that is in the replacement compressor and MEASURIZING the amount in order to install NEW refrigerant oil plus ONE ounce extra into the compressor prior to it's installation onto the vehicle.
Since each and every manufacturer's having different styles of A/C systems the amount of refrigerant oil and refrigerant (freon) amounts vary.
This atmospheric air that is absorbed into the refrigerant oil contaminates the oil and upon installation and run, Spreads this contaminated oil into the other components of the A/C system thus causing a high probabilty due to the coldness of the freon whereas the moisture is now spread thru out the entire system causing freezing of the oil thus causing severe pressure problems within the system of which eventually causes compressor failure.
What you need to do is perform a complete system flush at least 2 or 3 times to be sure that you have expelled all of the air and component(s) debris that this present within the entire system due to internal compressor failure whch spreads this debris thru out the system.
What you are going to have to do is:
1. Remove the tube and compressor from the system.
2. Drain out the old oil from the new/used compressor and mount the compressor onto the vehicle and attach all lines using NEW "O" rings that are made for A/C useage as they are made of a different compound from normal "O" rings due to the extreme temperatures at which they must endure during normal A/C operation.
3. Remove the orfice tube and leave it OUT at this time.
4. Tighten all of the A/C lines and flush out the system 2 or 3 times until you no longer see any debris being expelled during the flushing procedures.
5. Install NEW refrigerant oil in the amount specified by the manufacturer for your specific vehicle.
6. Using a vacuum pump for about 10 minutes and extract all of the air from the system.
7. Install a NEW orfice tube and re-evacuate the system for a minimum of 20 minutes and make sure that the system will maintain maximum vacuum as seen via the manifold set (A/C gages) for a minimum of 20 minutes in order to see if you have any leaks. If the vacuum drops off significantly you have a leak somewhere that needs to be fixed and then re-evactuate the system again after the leak is repaired to be sure that you have no additional leaks.
8. Install the correct amount of refrigerant per the manufacturers recommendation and procedure.
This should take care of your problem and put your system at maximum efficiency. However, Sometimes there are debris particles that did not get flushed out during your flushing procedures and any remaining debris will be collected onto the orfice tube at which time the orfice tube may require replacement.
If you are comfortable enough and feel confident enough to perform this delicate repair procedure, Go to it.
HINT: To much or to less amounts of refrigerant oil and or refrigerant beyond the manufacturers recommended amounts will cause an efficiency loss of the A/C system and can cause component failure(s).
let me know.
autohelp
