Question about 1999 Chevrolet Blazer

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I just changed my air condition system

I CAN NOT FIND WHERE MY ORIFICE TUBE IS LOCATED ON MY 1999 CHEVY BLAZER LS 4.3 2DR

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On pass side underhood you will see reciever/drier(large line goes to it,Then you will see small ac line by it,disconnect small line, orfice tube is inside it.

Posted on Jun 19, 2009

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Have you looked behind the grille?

Posted on Jun 19, 2009

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I have a compressor that works for air conditioning. The fan also works too. But the light inside still is flashing. Theres something thats causing the gas not to circulate.


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Where is orifice tube located in the a/c system


Hi, Orifice tubes are located in the high pressure line where it goes into the evaporator (close to firewall) or the condenser ( close to radiator) or in the line itself. I believe in my jimmy (about the same as a blazer) it was near the firewall where the high pressure line unscrews. Unscrew the line (think its a large coupler) and it should be inside there. Clean the cavity of any dirt or debris well and note the direction of the old orifice for installation.
Please rate this answer......Thanks! Mike

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What is the purpose, and what is the proper location of the orifice tube in the air conditioning system on my 1991 chevy silverado?


The orifice tube restricts the flow of refrigerant to the evaporator. This restriction allows high pressure liquid freon to change into low pressure freon before entering the evaporator. The orifice tube is located inside the hose running between the condenser and the evaporator. You'll need an orifice tube removal kit if you are looking to remove it.

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We are trying to either get a diagram for an 2002 chevy impalas ac system,or the location of the orifice tube.please help.


It is located inside the condensor tube running to the evaporator.

Here are the removal/installation instructions as per alldata:

TOOLS REQUIRED

J 39400-A Halogen Leak Detector
J 26549-E Orifice Tube Remover

REMOVAL PROCEDURE
-Recover the refrigerant. Refer to Refrigerant Recovery and Recharging.
-Remove the air cleaner assembly.
-Remove the vacuum brake booster.
-Remove the condenser tube.
-Use J 26549-E in order to remove the expansion orifice tube. IMPORTANT: DO NOT use any solvents or chemicals to clean the porous plastic inlet filter of the expansion orifice tube.
-Inspect the expansion orifice tube for the following conditions and clean or replace with a new tube as indicated:
-Broken plastic frame (1); replace the tube.
Inlet filter (3) damaged or plugged with fine gritty material; replace the tube.
Inlet filter (3) coated with metal chips, flakes, or slivers; remove the coating with low pressure shop air ONLY and reuse if the filter is cleaned satisfactorily. Do NOT reuse the O-ring seals (2).

INSTALLATION PROCEDURE

IMPORTANT: Lubricate the new O-ring seals (2) with mineral base 525 viscosity refrigerant oil.
If you reuse the orifice tube, install new O-ring seals (2).
Carefully grasp the edge of the expansion orifice tube (1) without touching the inlet filter (3) and insert the expansion tube into the condenser tube until fully seated.
-Install the condenser tube.
-Install the vacuum brake booster.
-Install the air cleaner assembly.
-Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.
-Leak test the fittings of the component using J 39400-A.

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2 Answers

1999 ford e250 ac is not woking. I tried recharge refragerant. It wasn't low. What do I look next?


Try draining the system and removing the orifice tube and cleaning itIt is located in the liquid line going into the firewall,remove the quick connector nut,and it is in the swelled area of the line,use needle nose pliers to remove,and install the orifice tube.Please rate if this is helpful.

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