Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Chevy
This answer was rated:

This is regarding the 1990 K1500 383 stroker FAST EZ efi 2.0

project. Where/how is the AC...
This is regarding the 1990 K1500 383 stroker FAST EZ efi 2.0 project. Where/how is the AC orifice tube installed?
Show More
Show Less
Ask Your Own Chevy Question
Answered in 48 minutes by:
8/20/2017
kalamykid
kalamykid, Shop Owner/ Tech
Category: Chevy
Satisfied Customers: 4,642
Experience: I HAVE OWNED MY OWN SHOP FOR OVER THREE YEARS. I HAVE THE TOOLS AND SOFTWARE TO ANSWERE ALMOST ANY Q
Verified

The oriface tube is in the high side line at the evaporator core. You have to remove the high side line from the evap core and look into the line of the evap core. It should be right there a the top of the line. When you put the new oriface tube in, the end that has the orings on it goes into the evap core first.

Ask Your Own Chevy Question
K. Wiggins
K. Wiggins, ASE Certified Technician
Category: Chevy
Satisfied Customers: 3,068
Experience: ASE Certified Technician, Associates Degree in Automotive Technology, 15+ years in the trade
Verified

Hello and thanks for requesting me. On this model the orifice tube is NOT located at the evaporator core. It's at the line coming from the condenser.

You'll need to remove the passenger side parking light assembly and grille, then you can access it. A picture here shows which line. Let me know If I can help further.

Ask Your Own Chevy Question

Correct, black end into tube. Put a little pag oil on the oring and slide it in until the end is just below the surface, you'll feel it bottom out on the crimp in the line.

Ask Your Own Chevy Question

Also make sure to put 2oz of your pag oil into the new condensor. Total system capacity is 6oz. I usually do 2 in condenser, 1 in drier, 1 in evaporator and 2 in compressor

Ask Your Own Chevy Question
Customer reply replied 3 months ago
Is it directional? Does flat surface of oriface tube align with anything?

No, only orientation that matters is the long part with screen

Ask Your Own Chevy Question
Customer reply replied 3 months ago
I have a 1990 K1500 Silverado that I have been using as a donor truck for my project truck. My project truck did not come with factor AC, the donor truck did. I removed the entire hvac box, with blower motor, heater core, evaporator core etc, installed it into my project truck. When I went to install a new evaporator core, one of the lines was soldered incorrectly, would not fit like it should have. Before, I took the donor truck apart, I was driving it, and know that the AC worked great, with no issues. I had to get this part of the project completed. Installed the donor vehicle's evaporator core back into place knowing that there were no issues with it. The picture that I sent is of the donor vehicle's condenser. It is built differently than the new one that I am installing and the picture that you sent. Would the donor vehicle's oriface tube be located in the same position in the high side line as the the new one that I am installing? Would it be in the evaporator core that is now installed in my project truck? I don't believe that it is in the evaporator core.

I can't see a crimp in that one, but if you have no orifice in the used evap core and the tube in the new condenser it will work properly. On these it's always going to be in the small diameter line running from condenser to evaporator. The give a way is a crimp or indention in the line a few inches past the fitting.

Ask Your Own Chevy Question
Customer reply replied 3 months ago
Good call on the crimp. It wasn't in the evaporator core or in that section on line at the condensor. On the donor truck, the high side line that goes from the condenser to the evaporator is 2 piece. There is a crimp in the line near the fittings, about the midpoint if it were a 1 piece line. It was there at the crimp. This will still work correct? The new condensor would have the black end going in first pointing down towards the condensor. The donor truck's oriface is pointing in the opposite direction, with the black end with the screeen pointing towards the evaporator core. Will that matter? I have a new high side line, not sure if it's 1 piece or 2 piece. If it is one piece will I need to use the donor truck's high side line and install the oriface tube in the same location or install the oriface tube in the new condensor as we previously discussed? Can the new oriface tube be installed in the condensor in the direction the we previously discussed and the new line?

The donor truck must of been built before oct 31 of 89, that's when they went to the newer design like the new condensor you bought.

If you have to use the donor trucks line and condenser you'll have to put it in that line. From what I see it doesn't look like the new condenser would work with the donor truck line. (angle of the condenser outlets.

Whenever you replace an orifice tube it always goes long screen side towards the condenser. Under that screen is the orifice that turns the refrigerant from liquid to a gas to enter the evap core.

I hope that makes sense. HERE is a diagram of how the flow works

Ask Your Own Chevy Question
Customer reply replied 3 months ago
I don't have to use the donor truck's condensor and line. I do need to use the installed evaporator core. Will the evaporator core work with the new condensor if use the new, not the donor truck's line?

Thread wise it should work. May have to need the line some if it's off. I don't think they changed evap design so everything should work with new line and condenser.

K. Wiggins
K. Wiggins, ASE Certified Technician
Category: Chevy
Satisfied Customers: 3,068
Experience: ASE Certified Technician, Associates Degree in Automotive Technology, 15+ years in the trade
Verified
K. Wiggins and 87 other Chevy Specialists are ready to help you
Ask your own question now
Customer reply replied 3 months ago
That it the line with the crimp. The oriface tube points towards the evaporator core. That seems like it would indicate that the flow is reversed. However the evaporator core has a larger diameter tube (for low pressure) on the top, and a smaller diameter tube on the bottom (for high pressure). The orientation of the evaporator core seems correct, like it should flow in the right direction. Why would the AC work if the oriface tube points in the opposite direction?
Customer reply replied 3 months ago
That's the R front tire with the line pointing in the direction that it was removed. The line with the fitting and schrader valve just to the inside of the tire is where they fasten.
Customer reply replied 3 months ago
I just checked the new evaporator core that was built incorrectly. It came with a new oriface tube. That means that the new evaporator core is supposed to have the oriface tube installed into it. The oriface tube would be pointing in the same direction as the donor truck's setup.

OK, so does the new condenser and line work with donor evap?

Ask Your Own Chevy Question

I'll be back in about 30-45 minutes.

Ask Your Own Chevy Question
Customer reply replied 3 months ago
I haven't installed the condensor yet, but I am sure that I could get either the new line or the donor truck's line fit. Without the oriface tube, both the new and the donor truck's line should function the same. They are both lines. The engine does not run yet, so there is no way to check if everything works together right now. I do need to get the front of the truck together to get it to the exhaust shop. That's why I need to figure out if the new condensor will work with the evaporator core.
Customer reply replied 3 months ago
I will get the condenser w/o oriface tube, if it is needed to make this work. That is the condenser that is in the donor truck. I could use the donor truck line, if I needed to. I am still concerned that the oriface tube would be installed in the opposite direction of your diagram. I am 100% sure, positive, that the AC in the donor truck worked with the black screen part of the oriface tube pointed towards the evaporator core.

Thanks for your patience. I can confirm the ac will work with the tube either way. I would recommend installing it long end toward condenser for the filter effect of the screen though.

Ask Your Own Chevy Question
Customer reply replied 3 months ago
I understand the filter screen theory. That does make sense. However, in this situation, do you think it would be best to get a similar condenser w/o oriface tube, like the picture that I sent, because I am using the evaporator core from the donor truck, and that I know that the AC worked great with the oriface tube long end pointed towards the evaporator core. I am basically using the entire AC system from the donor truck. I am not sure if I used the condenser that had the oriface tube with the pointed towards it, that it would work.

Yes, I would go ahead and get the one that matched the other truck. That way you also know the compressor hose assembly will bolt up as well.

Ask Your Own Chevy Question
Customer reply replied 3 months ago
Are the oriface tubes the same or diffferent depending on what direction that they face? I know that they aren't much, but I think that I am just going to pull out the oriface tube and clean it. Can they be cleaned and reinstalled with a new o-ring? Can they be cleaned with brake parts cleaner?
Customer reply replied 3 months ago
I would need the evaporator mounting correct?
Customer reply replied 3 months ago
I would need the evaporator mounting correct? Thank you.

Yes, the evap mounting (white one) is the one you want.

Ask Your Own Chevy Question

Confirmation via GM TSB

Ask Your Own Chevy Question

PN mentioned here at rock auto. Nothing wrong with RA's house brand wither, I use them often.

Ask Your Own Chevy Question

^either

Ask Your Own Chevy Question
Customer reply replied 3 months ago
I just pulled the oriface tube out of the donor truck's line, placed it on the tire. That is the orientation of it in the tube. It is installed with the short end into the tube first. The screen end towards the condenser. I still need the condenser w/o oriface tube, and would need the condenser mounting correct?

Correct

Ask Your Own Chevy Question

That's definitely how it should be.

Ask Your Own Chevy Question
Customer reply replied 3 months ago
Do you have the part number for that oriface tube?
p>
Ask Your Own Chevy Question
Ask Your Own Chevy Question
Customer reply replied 3 months ago
That looks like evaporator mounting one. Now that we know that the screen faces the condenser, I would need a condenser mounting with a black screen end correct?

I'm basing it off this tsb which calls for that part #

Ask Your Own Chevy Question
Customer reply replied 3 months ago
one

155151 looks to match the one you showed on the tire. Both that and the black and white one have the same orifice size of .072. There's a very small diameter difference as seen HERE and HERE

Ask Your Own Chevy Question
Customer reply replied 3 months ago
Is the 155151 what I need then, regardless whether it is black or white. What I am installing is a 1st design setup correct?

Correct, this is 1st design with orifice in liquid line. 2nd design is the orifice right in the condenser outlet.

Ask Your Own Chevy Question
Customer reply replied 3 months ago
I bought a new second design condenser, compressor lines, high side line to evaporator core, accumulator. I checked the fittings for both the donor truck's and new second design lines from condenser to evaporator core. They are identical. I didn't measure them with a micrometer, but the second design installed, threaded into the evaporator core just like the first design does. Now that we have established that both the first and second design setup both have the oriface tube with the screen pointing towards the condenser, I should be good to use the second design condenser, oriface tube and lines correct?
Customer reply replied 3 months ago
I checked everything for fit. It matches up.

Great, you are good to go then on using the second design.

Ask Your Own Chevy Question
Ask K. Wiggins Your Own Question
K. Wiggins
K. Wiggins
K. Wiggins, ASE Certified Technician
Category: Chevy
Satisfied Customers: 3,068
3,068 Satisfied Customers
Experience: ASE Certified Technician, Associates Degree in Automotive Technology, 15+ years in the trade

K. Wiggins is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,287 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,322 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,865 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,916 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,721 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
Blower motor doesn't run on my sons 2005 chevy Pick up.
blower motor doesn't run on my sons 2005 chevy Pick up … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,101 satisfied customers
I have replaced the blower motor, the blower motor relay and
I have replaced the blower motor, the blower motor relay and resistor and still have no air flowing out of vents … read more
Jaybird61
Jaybird61
Master Automotive Mechanic
2,084 satisfied customers
Engine light on" clean exhaust filter continue to dric. Ve
engine light on " clean exhaust filter continue to dric … read more
BOBBYSS
BOBBYSS
TECHNICIAN/ADVISOR
Associate Degree
8,343 satisfied customers
My son needs to replace his heater core but I have a
My son needs to replace his heater core but I have a question normally when your heater core leaks or goes out it leaks on the inside of the car well the leak is on the outside of the engine is that n… read more
GM Bob
GM Bob
Automobile Technician
High School or GED
995 satisfied customers
The blower motor is not coming on at all checked the blower
The blower motor is not coming on at all checked the blower motor and it is working … read more
Jared D
Jared D
Shop Supervisor
Bachelor\u0027s
3 satisfied customers
Engine makes a noise like a spark knock or an exhaust leak
Engine makes a noise like a spark knock or an exhaust leak from the right side of the engine during acceleration, this doenst happen all the time but it seems to run better when it doesnt make the noi… read more
Dodge expert
Dodge expert
ASE MASTER TECH, REPAIR FACILITY OWNER
High School or GED
3,636 satisfied customers
I just replaced my blower motor resistor and put in a
Hi , I just replaced my blower motor resistor and put in a pigtail spliced into the factory harness . there was no blower on high position 5 / this is the second time I have done this . now got every … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
The heater blower motor doesn't work. I checked fuses so I
the heater blower motor doesn't work. I checked fuses so I know that tyhat is not it. … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
The rear blower motor is not working and was wondering if
The rear blower motor is not working and was wondering if there was a separate fuse panel for the back of the vehicle. … read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
The air conditioner blower motor does not work. I have
The air conditioner blower motor does not work. I have replaced the resistor and the speed rheostat. With any mode and speed setting I get 12 volts to the blower plug, but neither the old nor the new … read more
Randall
Randall
Auto Technician / Consultant
Vocational, Technical or Trade Scho
69 satisfied customers
My heater core has been disconnected and I would like to
Hi my heater core has been disconnected and I would like to reattach the hoses … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,322 satisfied customers
I had a new heater core installed in my 99 Blazer - i only
I had a new heater core installed in my 99 Blazer - i only get hot air when it set to 82 degrees other wise i only get cold air … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,122 satisfied customers
Coolant leak passenger side heater core box. Not sure how
and the guy didn't tell me when I should top up and gas jockey put concentrate instead of dexcool … read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
Blower Motor is not working. Just replaced the motor
Blower Motor is not working. Just replaced the motor resistor . … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,122 satisfied customers
Blower motor isn't working on my 2008 Chevy Trailblazer
blower motor isn't working on my 2008 Chevy Trailblazer changed the blower resistor and it worked for a short time but quit. Checked for power to blower motor but none found power from climate control… read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,322 satisfied customers
Blower motor doe's not fuction. There is very low voltage at
blower motor doe's not fuction. There is very low voltage at blower motor connector not the 12 V there should be. 2005 model … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Blower motor. Changed resistor. found that motor will work
Blower motor. Changed resistor. found that motor will work if I wiggle the connector at the motor itself. Think it is just a bad connection? … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Heater core failed, it's leaking into the passenger side
I haven't fixed it yet. It happened yesterday after my AC quit. I live in Louisiana so not having AC is tough … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,101 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x