Question about 1999 Buick Century

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'99 bUICK CENTURY A/C blows warm air

I'm trying to replace orifice tube on the liquid line, looks like I need to remove the brake booster to get access to the fittings, how do you get the booster off. There are no nuts inside the car and I can only see one on the outside and can't even get to it, or is there some other way to get to it?

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There are nuts inside the car, they are covered up by the sound deadner, have the manual in front of me, 4 studs go inside the car and on those are four nuts.

Posted on Jun 28, 2009


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2 Answers

What is a liquid line on a auto ac system?


If you are not somewhat mechanically inclined you should let a professional do this as the AC coolant will be released. You will have to re-charge the system upon completion. Here are some quotes from on-line mechanics to give you a better idea what you are looking for. The Orifice tube can be determined as faulty when your AC doesn\'t cool properly in the summer or heat well in the winter. Often you will smell antifreeze inside your car\'s interior.

"It\'s buried pretty good. It\'s in the liquid line that runs along the left inner fender well, under the brake booster. If you look closely at the line, you will see a connection and dimples in the line where the tube is located." Quote from ASE: Wrenchtech Aug 2011.

The liquid line is located in the area of the abs pump.

"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," below is an example of 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." ---Dennis Weid

The tool comes as a single apparatus or you can get the kit. Here are some examples of manufacturers who make these parts. I have removed the sales information because there are literally hundreds of choices out there including your local parts stores:

Mastercool 92311 Deluxe Orifice Tube Repair Kit This 5 piece universal kit will remove and install any style orifice tube.

Another suggestion comes from Ronnie Bennett Sr.: "The orifice tube will be on the small line joining the evaporator, the ac line will be swelled where the orifice tube is at, you may not see it, but use needle nose pliers to remove it, and to install it."

But I would look at YouTube for a better understanding of what you are looking for, how it works and how to remove and replace it, so try this site to start with and look further. You\'ll be surprised the amount of data available and a video is worth a zillion words.


If you haven\'t seen pictures of the part, this is what it looks like:


May 04, 2014 | 1998 Chevrolet Lumina

2 Answers

HArd brake pedal and low stopping power after changing brake booster

look between master cylinder and brake booster if the little pin is there in the middle. you definitely have a booster problems or vacuum
hope it helps

Mar 23, 2014 | 1999 Buick Century

1 Answer

Where is the orifice tube located to put a new one in?

The orifice tube is located inside the liquid line where it connects to the condenser. This line is located on the passenger side of the car and has the low side charge port on it. this line unscrews right where the orifice tube is located... Hope this helps

Sep 08, 2012 | 1992 Buick LeSabre

1 Answer

1993 buick century orifice tube

The orifice is located at the inlet tube to the evaporator core on the firewall, just suction the system out and remove the pressure line to the evap core, it is right there.

Aug 09, 2012 | 1993 Buick Century

1 Answer

1999 Buick Century Custom _ Brake Problem My 99 Century has little to no assist and it makes an air hissing sound when depressing the brake pedal. I think that this means that I have a faulty brake...

nope you have to replace them.when brake booster diaphram leaks you cant plug them.i have bought one at salvage yard in good shape.until i got a new one.get your brake booster from inside salvage yard where they stock them inside out the weather.dont take any brake booster off old outside cars been in all kinds bad weather. there vacuum diaphram probably dried up will leak also.

Jun 11, 2011 | 1999 Buick Century

1 Answer

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:


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

-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).


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.

Aug 20, 2010 | 2002 Chevrolet Impala

1 Answer

1996 Buick Regal air conditioning

I think you may have a clogged orifice tube (possible compressor failure starting) this can be checked with a system pressure test.
When an expansion valve or block fails, always replace the drier. Also flush the condenser and liquid lines.

May 03, 2009 | 1996 Buick Regal Olympic Gold

1 Answer

Location of the oricie tube

I followed the liquid line from the evaporator , back towards the condenser & quickly lost it it behind the power brake vacuum booster . The line was cold , with the A/C running .

I followed the liquid line forward , from the high pressure service port , towards the evaporator . I lost the line under the ABS module / assembly .The line was warm .

The orifice tube had to be some where in between , under the other stuff .

I finally found a crude picture of this entire liquid line . I could see , in the picture , where the orifice tube was .

I bought a little round mirroe on a telescoping handel . With it and a flashlight I finally could see the V orifice tube . It is tucked away to the right of the vacuum brake booster ( looking straight at the booster ) in the corner formed bu the fire wall , fender and wheel well .

It is going to be a huge pain to get to .

Thanks ,

Jul 15, 2008 | 2002 Buick Century

1 Answer

Orifice Tube - 2002 Buick Century

Some are in the inlet to the evaporator and some could be in the condenser line. You can get a new orifice tube on autozone for $5 - 20,16301861/shopping/partTypeResultSet.htm

Jul 14, 2008 | 2002 Buick Century

2 Answers

99 Buick Century wheels

There's a little rust making the wheel stick to the rotor. Just give it a kick to the tire and it'll break it loose.

Jun 14, 2008 | 1999 Buick Century

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