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Username Post: Orifice tube location        (Topic#262927)
Forum Newbie
Posts: 1

Reg: 05-13-11
05-13-11 09:03 PM - Post#2089813    

I have a 1998 Chevy K1500. I've replaced the compressor, a/c hoses, and accumulator. I need to replace the orifice tube. Problem is I can't seem to find where it is. I have checked the bottom line of the evaporator..not there, I've check both evaporator lines...nothing. Any ideas?

This truck was wrecked and rebuilt. It is possible that this part was left out.

Where should it go?


Low priced Genuine GM Auto Parts
Posts: 26442
Age: 44
Loc: Texas
Reg: 08-01-03
05-14-11 05:16 AM - Post#2089861    
    In response to shortcircuitky

Welcome to the forum,

Since about mid-year 1991, the orifice will be in the lower line on the condenser, so you'll have to remove the grille to access it.

Early 1991-back to 1988, it was in the lower line off the evaporator.

94 C2500LD / 97 Suburban LS1 / 06 300C SRT8 / 06 Magnum SRT8
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Subject Matter Expert - Senior Member
Posts: 3239
Loc: Twin Cities, Minnesota, U...
Reg: 04-25-04
05-14-11 05:53 AM - Post#2089872    
    In response to shortcircuitky
For those of you that are wondering why you are not getting replies to your thread:

Did you give the model, year, engine, fuel system type, and transmission information?

If the it has been altered from stock let us know about that too.

Super Senior Member
Posts: 3604
Loc: Central Arkansas
Reg: 04-28-02
05-15-11 05:20 AM - Post#2090221    
    In response to Chevytech

That would be it alright. Those sneaky engineers removed it from the "normal" location nearer the firewall and hid it behind the grille.
69 Chevy step
06 GMC ccsb Z71
00 GMC excab Z71
All GM...'nuff said!
JR Nation

Forum Newbie
Posts: 4

Reg: 09-14-11
09-14-11 06:02 PM - Post#2137337    
    In response to someotherguy

I have a 97 Sierra and after trying to locate and replace the orifice tube, I couldn't find one in the lines connecting to the condensor. I was going to put one in anyway but the one they sold me didn't fit. After investigating some more I realized that someone had put a pancake style filter/orifice? inline from the condensor to the evaporator. The reason I am confused is because I'm trying to fix my ac and my gauges are saying that I'm not getting enough pressure (high side) and I had put 8 oz of pag oil in my compressor before evacuating/recharge. I did notice oil wanting to come out of the high side ports when installing. Maybe the line is clogged at the pancake?

Frequent Contributor
Posts: 1011
Loc: Fort Worth, TX
Reg: 11-27-06
09-15-11 09:14 AM - Post#2137486    
    In response to Bonsai

The orifice tube is in a slightly bulged section of the line at the threaded connection to the condensor. Once you break the fitting you will see the end of it. Do yourself a big favor and borrow from the parts store or buy a puller/installer tool. The new ones are hard to push in most of the time and you will end up mashing the end of it pushing it in. Make sure to coat the o-rings with PAG first.

8oz seems like a lot of oil to add unless the system was empty of it before. If it is wanting to leak out when you hook up your gauges you may have a tad too much oil in there.
98 C1500 Silverado extended cab 5.7 auto 2wd Fort Worth, TX.

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