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The orifice tube is located at the firewall, INSIDE the refrigerant line, where the end of the flex line connects to the metal pipe which, in turn, connects to the evaporator coil inside the air exchanger.
best advice is the method i would use to located the orifice tube in the 2000 chevy venture. check the automotive repair book section in your local library. Most libraries have repair manuals on their automotive shelf section. find the a/c manual for your year and model car. make a copy of the page that has the information you need. you will need to make a copy because the library will not let those manuals be checked out. you might want to google for the location of the orifice tube location. I hope this helps.
It is located inside the air conditioning hose where it connects to the evaporator, some are replaceable some you have to buy the whole hose when it goes bad.
The orifice tube is located inside the low pressure line, usually just before the evaporator. DO NOT forget to measure and replace the oil that you get in the dryer, as a percentage of total system capacity for oil. It is special oil.
the fixed orifice is located in the inlet tube to the evaporator core, this is where the small high pressure AC line from the compressor connects to the tube sticking out of the engine firewall, u will most likely need a special tool to remove it, here is a web link to the tool, don't damage the evaporator core by trying to remove the orifice tube without this if it is stuck down in the tube.
the orfice tube is locate in the line between condenser and evaporator. near the spring lock coupling. you must unbolt the cruise servo and overflow bottle, reposition them out of way and you will see the line connection..the orfice is inside line near that uniion. the ac system must be evacuated prior to removal, and recharged afterwards..
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