A/C ORIFICE TUBE LOCATION. please help!! - S-10 Forum
 
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post #1 of 21 Old 04-22-2008, 11:34 AM Thread Starter
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Exclamation A/C ORIFICE TUBE LOCATION. please help!!

I'm at school right now doing my a/c lab, and I wanted to replace my orifice tube, but it's not where I thought it would be. I thought it would be near the condenser under the battery tray. It's a 96 GMC Sonoma, X engine, 4x4.

PLEASE HELP!

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post #2 of 21 Old 04-22-2008, 11:34 AM Thread Starter
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Re: A/C ORIFICE TUBE LOCATION. please help!!

Mitchell on demand has been no help, also....
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post #3 of 21 Old 04-22-2008, 11:43 AM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

My '98 only has 2 joints in the HP line. 1 under the battery and 1 at the condenser inlet. Got to be one of the 2. I would've expected under the battery too. If it's not there then it has to be at the condenser inlet.

Good luck!
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post #4 of 21 Old 04-22-2008, 11:44 AM Thread Starter
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Re: A/C ORIFICE TUBE LOCATION. please help!!

it's not in either of the two lines coming from the condenser, and I just found it's in the evaporator....
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post #5 of 21 Old 04-22-2008, 11:48 AM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

HOLY COW! I meant to say evap. and put cond. instead. So sorry! Hope I didn't cause you any extra work.
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post #6 of 21 Old 04-22-2008, 01:05 PM Thread Starter
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Re: A/C ORIFICE TUBE LOCATION. please help!!

it's cool, man, the condenser was where I looked first. But now I know it's at the evaporater.... still a PITA
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post #7 of 21 Old 04-22-2008, 01:09 PM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

That's good!

Good luck in school!
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post #8 of 21 Old 04-22-2008, 10:19 PM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

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Originally Posted by RickRock View Post
it's cool, man, the condenser was where I looked first. But now I know it's at the evaporater.... still a PITA
Where is the evaporator? Is it behind the black plastic under the hood? Or is it behind the dash. I'm going to replace my orifice tube when I rebuild my A/C and would like to know where it is beforehand.


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post #9 of 21 Old 04-22-2008, 11:46 PM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

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Where is the evaporator? Is it behind the black plastic under the hood? Or is it behind the dash. I'm going to replace my orifice tube when I rebuild my A/C and would like to know where it is beforehand.
It's behind the black plastic. Got that aluminum cylinder (accumulator - drier) hanging off of it.
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post #10 of 21 Old 04-23-2008, 12:25 AM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

So do I have to remove the black plastic?


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post #11 of 21 Old 04-23-2008, 09:53 AM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

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So do I have to remove the black plastic?
No. The orifice tube is located in the high pressure line where the line enters the evaporator.

There are 2 tubes on the evap.: a 3/4" line at the top with the aluminum cylinder (accumulator - drier), and a 3/8" line at the bottom. The orifice tube is located in the 3/8" line at the tubing joint where it enters the evap.

Be sure to replace the accumulator - drier anytime you open the system too.
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post #12 of 21 Old 04-23-2008, 10:04 AM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

Quote:
Originally Posted by Yogi View Post
No. The orifice tube is located in the high pressure line where the line enters the evaporator.

There are 2 tubes on the evap.: a 3/4" line at the top with the aluminum cylinder (accumulator - drier), and a 3/8" line at the bottom. The orifice tube is located in the 3/8" line at the tubing joint where it enters the evap.

Be sure to replace the accumulator - drier anytime you open the system too.
Got it, thanks. I actually ordered those parts last weekend and they should be here today (including a new drier). A replacement orifice tube was only $2.


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post #13 of 21 Old 04-23-2008, 10:06 AM
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Re: A/C ORIFICE TUBE LOCATION. please help!!



Is that it^^? Where the brass fitting is going into the black plastic?


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post #14 of 21 Old 04-23-2008, 10:12 AM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

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Is that it^^? Where the brass fitting is going into the black plastic?
Yes, that's it. Not very accessible, huh! Good luck on getting it out!
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post #15 of 21 Old 06-08-2008, 12:18 PM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

what size are the bolts to get it apart?
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post #16 of 21 Old 06-08-2008, 12:22 PM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

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what size are the bolts to get it apart?
All the GMs I have seen with that are 32mm and.......I want to say 24mm.
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post #17 of 21 Old 06-08-2008, 12:27 PM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

Thanks
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post #18 of 21 Old 06-08-2008, 10:11 PM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

Yeah, that sounds right. To get the orifice tube out take a pair of needle nosed pliers and stick it in there, pinch, and pull out.


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post #19 of 21 Old 06-08-2008, 10:19 PM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

heres a tip, take the drier off of the evaporator. you will have more working room. also if its too hard to get both wrenches in there, you can use a 6in. cresent wrench. I had to change them on a 96 blazer and a 98 s10 both 4.3s

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post #20 of 21 Old 06-08-2008, 11:35 PM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

While room was limited.. I didn't really have a problem getting a 10" crescent wrench down there with enough room to break it loose.


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post #21 of 21 Old 06-09-2008, 12:20 AM
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Re: A/C ORIFICE TUBE LOCATION. please help!!

thanks..im going to take it out one day this week.
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