A/C help '93 Suburban plz

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April 6th, 2010, 6:51 AM

VanGo

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A/C help '93 Suburban plz

Does anyone know where the orifice tube is on a '93 C1500 Suburban with dual air? I want to know if the tube screen is contaminated or not. The PO handed me a used replacement compressor and said the A/C wasn't working. The system is discharged - I didn't ask how.
Thanks,
Justin

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April 7th, 2010, 9:40 AM

VanGo

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Found the info on another site and located my orifice tube. It's much smaller than I expected, a little like a pencil.

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ontVertAlignInTxbx/> <w:Word11KerningPairs/> <w:CachedColBalance/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> <m:mathPr> <m:mathFont m:val="Cambria Math"/> <m:brkBin m:val="before"/> <m:brkBinSub m:val="--"/> <m:smallFrac m:val="off"/> <m:dispDef/> <m:lMargin m:val="0"/> <m:rMargin m:val="0"/> <m:defJc m:val="centerGroup"/> <m:wrapIndent m:val="1440"/> <m:intLim m:val="subSup"/> <m:naryLim m:val="undOvr"/> </m:mathPr></w:WordDocument> </xml><![endif]--><style>  </style> ORIFICE TUBE REPLACEMENT
Removal ("C" & "K" Series)
1) Discharge A/C system, using approved recovery/recycling equipment. On models equipped with front A/C system only, remove front grille. Using a backup wrench, loosen condenser-to-evaporator (liquid) line fitting at condenser and disconnect line.
2) On models equipped with rear A/C system, loosen condenser to-evaporator (liquid) line fitting between junction block and evaporator. If necessary, remove air cleaner assembly.
3) On all models, remove and discard fitting "O" ring. Using Orifice Tube Remover/Installer (J-26549-E), remove orifice tube from liquid line. If difficulty is encountered during removal of a plugged or restricted orifice tube, remove as much residue as possible.
4) Using a heat gun or hair dryer, carefully apply heat 1/4" from dimples on liquid line. Be careful not to overheat line. If A/C pressure switch is located near orifice tube, remove switch to protect it from heat.
5) While heat is being applied, grip orifice tube using orifice tube remover/installer. Use a turning motion along with a push-pull motion to loosen and remove orifice tube.
Installation
1) Clean liquid line fitting with NEW refrigerant oil. Coat inside of liquid line and NEW "O" ring with NEW refrigerant oil. Lubricate NEW orifice tube and "O" ring with refrigerant oil and insert them into liquid line. Insert longer orifice tube screen (inlet end) into condenser outlet line first, toward condenser.
2) Tighten liquid line fitting to 18 ft. lbs. (24 N.m). To complete installation, reverse removal procedure. Evacuate, charge and test system for proper operation.

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