Orifice tube - Help!!!
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Freshman User
Joined: Sep 2004
Posts: 26
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From: Alabama
Orifice tube - Help!!!
I have a 92 F150 and am in the process of converting to 134a. I am replacing the compressor, filter-dryer and orifice tube, if I can find the orfice tube. I have a Haynes manual, but it is no help. Exactly where is the orifice tube located??
I have read where it is on the entry or hight side of the condensor, before the coolant enters the condensor. If so, how do I get to it??
Any help from you or another forum buddy will be appreciated.
Thanks,
Chuck<!-- / message -->
I have read where it is on the entry or hight side of the condensor, before the coolant enters the condensor. If so, how do I get to it??
Any help from you or another forum buddy will be appreciated.
Thanks,
Chuck<!-- / message -->
Posting Guru
Joined: Jan 2002
Posts: 1,346
Likes: 8
From: Baltimore
The orfice tube is inside the hard metal line at the junction where a garter spring type connector is used to hold the two tubes together.
You use a special tool that spreads the garter spring and then you pull the lines apart. (The tool is also used to remove fuel lines). Most parts stores sell the tool. I think it's called a garter spring remover. Comes in a set with different size spring removers.
The orfice is located inside the tube going towards the firewall. Some people use a long drywall screw to extract the old orfice. If you look at the replacement orfice tube you'll notice it has two small nubs on it. They make a tool that hooks on to the two nubs so you can pull the orfice out.
You use a special tool that spreads the garter spring and then you pull the lines apart. (The tool is also used to remove fuel lines). Most parts stores sell the tool. I think it's called a garter spring remover. Comes in a set with different size spring removers.
The orfice is located inside the tube going towards the firewall. Some people use a long drywall screw to extract the old orfice. If you look at the replacement orfice tube you'll notice it has two small nubs on it. They make a tool that hooks on to the two nubs so you can pull the orfice out.
Last edited by F150xlt; Sep 4, 2004 at 12:37 AM.
Thread Starter
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Freshman User
Joined: Sep 2004
Posts: 26
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From: Alabama
Hardscrabble,
Thanks for the info. Bought the hose removal tool at Autozone and it came apart easily. I could not get the gummed up orifice tube out with the orifice tube removal tool, but I screwed a 4" sheetrock screw into the old orifice tube and was able to get it out.
Now the problem?? The orifice tube was completely clogged with a very black goo. (Probably why my compressor failed??). I have now decided to replace my condensor as I am afraid that it may have "black death" in it. The suction hose is dry and looks ok and not coated, but it is also black inside. Same for the liquid line.
Questions: (1) Does my evaporator have an expansion valve, or does the orifice tube handle this chore? (2) Should I flush the evaporator? (3) Is it safe to flush the hoses? Both hoses connected to the compressor have mufflers in the lines.
Any help appreciated!
Thanks for the info. Bought the hose removal tool at Autozone and it came apart easily. I could not get the gummed up orifice tube out with the orifice tube removal tool, but I screwed a 4" sheetrock screw into the old orifice tube and was able to get it out.
Now the problem?? The orifice tube was completely clogged with a very black goo. (Probably why my compressor failed??). I have now decided to replace my condensor as I am afraid that it may have "black death" in it. The suction hose is dry and looks ok and not coated, but it is also black inside. Same for the liquid line.
Questions: (1) Does my evaporator have an expansion valve, or does the orifice tube handle this chore? (2) Should I flush the evaporator? (3) Is it safe to flush the hoses? Both hoses connected to the compressor have mufflers in the lines.
Any help appreciated!
New User
Joined: Jan 2003
Posts: 15
Likes: 0
From: Ellijay GA
You do not have a expansion valve, the orifice tube takes its place.I would flush every thing out good (not with water).Also you should replace the accumulator too.you should flush it with freon and then pull three evacuations on the system.
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Elder User
Joined: Dec 2003
Posts: 655
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From: Miami
The orifice tube screen is there for exactly what it did, stop all the crap from clogging it and continuing to go through the system. A little piece of advice on flushing the system, or a couple pieces. First replace all the "o" rings a coat them with new PAG oil compatible with 134A. Second you can use brake cleaner for flushing. It evaporates and leaves no residue, and cleans incredibly. You can buy store brand for 99cents a can. Dis-connect the hoses going into the condenser (coil in front of radiator) spray the brake cleaner in the passenger side outlet (liquid line) then blow out using prefferibly dry nitrogen, but compressed air will work (not reccomened) if you have driers on the air system and pull a good vacuum. You want to blow out the opposite of the direction of flow the system operates. Do it on the evap as well, but leave the accumalator (big round thing on the evap outlet) off.
Al
Al
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