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I bet no one can figure this out

unctarheels9876 on Sat March 27, 2010 2:22 PM User is offline

Year: 1994
Make: Chevy
Model: Camaro
Engine Size: 3.4 v6
Refrigerant Type: r134
Pressure Low: 0
Pressure High: dontknow

Okay so my compressor kicks on and i start putting refrigerant in. I keep going and going and going but theres no pressure. Then i turn it off and i have lots of pressure. I figured something was clogged but i replaced the lines and drier. Then i blew through the evaporator it wasn't clogged either. Then i took off the line that comes out of my condenser and air is flowing through it too. Why do i have no pressure on my low side when the compressor is on but i have a lot when its off?
Please please help. I live in Orlando and I had to go through last summer without a/c and it was HELL
I don't want to do that again

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Dontwannabehot

Dougflas on Sat March 27, 2010 5:12 PM User is offline

Txv

Edited: Sat March 27, 2010 at 5:17 PM by Dougflas

Chick on Sat March 27, 2010 5:57 PM User is offlineView users profile

You do need to use high side gauges too, sounds like you didn't pull a vacuum either?? you don't say, so thats a guess, my vote is on the TXV also, but you need both pressures while charging.. Did you add sealer? More information is needed..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

unctarheels9876 on Sat March 27, 2010 7:17 PM User is offline

I know i need to buy a high side gauge too. Ill run up to autozone tomorrow and see if i can get on. I have a vacuum that can be used only with an air compressor but i don't have an air compressor. But even if i did i have no idea how to use it. Those directions are so confusing.
So what you're thinking is that the txv is stopping the refrigerant from flowing through? When i checked my evaporator I left the txv on so i was blowing through the txv and evaporator and the air was flowing through easily. Sorry about the lack of info i only know the basics of an A/C system

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Dontwannabehot

Edited: Sat March 27, 2010 at 7:23 PM by unctarheels9876

Dougflas on Sat March 27, 2010 8:29 PM User is offline

The vacuum pump that runs on an air compressor is only good as a small boat anchor. You may be able to borrow/rent a set of gauges and vacuum pump from Autozone. If you don't pull a proper vacuum, you can have moisture in the system and that will freeze up thus causing your symptom.

iceman2555 on Sat March 27, 2010 9:17 PM User is offlineView users profile

I was tempted to write a very caustic reply to this post...."I bet no one can figure this out.....!!!!" but then my new found tolerances took over and I with held.
However, from the information supplied.....you are probably correct...No one can figure this out....a strong suggestion...acquire the correct and necessary tools/equipment to service the system. Get it evacuated....get it charged properly and then re-post your information. Obtain a very good service manual.... read it....it will help.
The vac pump operated by air is as useless as ...well...it is simply useless.
There is a very good possibility that there is simply air and an insufficient amount of refrigerant in the system to allow the system to operate. Blowing air thru an evap/TXV is a very good way to contaminate a TXV.....and produce a possible restriction.
Noticed there was no mention of why the system failed previously. This would also be great info....and what parts were replaced and how the system was prepared for the new (?) parts.

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

unctarheels9876 on Sun March 28, 2010 1:20 AM User is offline

Haha i put that as the title just to try and get as many people as possible to read it. It went bad when i changed out my radiator. I had to take out the condenser as well and after that the compressor wouldn't kick on. About 9 months later i went to a mechanic that my dad is friends with and he vacuumed the lines and charged it and it still didn't work. Then he put a wire in where the relay goes (bypassing the relay) and it worked. The relay worked fine. We used a few different relays that all worked and the compressor didn't kick on until the relay was bypassed. But by then the compressor had gone so long without refrigerant that it would lock up. So i replaced it with a used one from the junkyard that kicks on and thats when i had the pressure issues. That was at the end of last summer and now i have begun working on it again but now my compressor doesn't kick on. So I'm gonna go get another one and then i guess rent a vacuum and recharge it. Unless the life story of my A/C has given anyone another idea.
I only replaced the compressor, drier and the hoses. I don't know much about preparing parts before i put them on. I would just clean them up as best i could before putting them on.

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Dontwannabehot

Edited: Sun March 28, 2010 at 1:24 AM by unctarheels9876

Chick on Sun March 28, 2010 9:10 AM User is offlineView users profile

The reason it's not coming on could be a code set which won't allow it to come on.. But you do need to start all over.. you need to change the expansion valve, clear codes and start all over.. Charging the system with air in it is a bad idea, it's not going to work, and will ruin the new compressor, if you don't have the tools, bring it to a qualified repair facility and have them charge it, cheaper in the long run.. Or buy/rent the proper tools and then you can do it yourself, there are NO shortcuts to AC repair...Do it right, you'll do it once..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

unctarheels9876 on Sun March 28, 2010 12:37 PM User is offline

I figured it was probably somewhere in the computer. Do i need an expensive computer to clear the codes? And how do I go about properly installing the new compressor?

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Dontwannabehot

unctarheels9876 on Tue March 30, 2010 12:33 AM User is offline

Will a code pop up on an obd1 scanner?

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Dontwannabehot

unctarheels9876 on Tue March 30, 2010 12:52 AM User is offline

And would this work for pumping out the air?
Ebay links prohibited on this forum. Moderator

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Dontwannabehot

Edited: Tue March 30, 2010 at 11:13 AM by Automotive Air Conditioning Information Moderator

Dougflas on Tue March 30, 2010 5:01 AM User is offline

Quote
Originally posted by: unctarheels9876
And would this work for pumping out the air?

Ebay links prohibited on this forum. Moderator

That pump will work. You are not pumping out air. You are placing the system into a vacuum stage that will boil off moisture. You may want to purchase the manual that this site sells. You'll be light years ahead so you can obtain the knowledge you need to complete this task. You may want to check this site for tools and equip. They have a starter kit that will get you going.



Edited: Tue March 30, 2010 at 11:13 AM by Automotive Air Conditioning Information Moderator

unctarheels9876 on Tue March 30, 2010 10:47 PM User is offline

okay cool
if theres a code keeping my compressor from coming on will it come up on a code reader?

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Dontwannabehot

mk378 on Wed March 31, 2010 9:18 AM User is offline

In general with GM cars of that era, the lockout could be reset simply by disconnecting the car battery for a while with the key off. But the lockout code stuff was on the CCOT systems. A TXV car like yours probably doesn't have it. I suspect all the refrigerant leaked out over the winter, which was detected by the pressure switch or sensor, and that's why it won't engage now. So the first thing to do would be to hook up your gauge manifold and see if there is any pressure. Or there is some other electrical problem. Anyway with a blown compressor you very likely have a lot of debris in the system particularly the condenser, and merely slapping on another compressor won't last. Every other part needs to be cleaned up or replaced or the debris are just going to cycle around and ruin the new compressor.

unctarheels9876 on Wed March 31, 2010 9:30 AM User is offline

oooh okay
how do i clean out the condensor and all the other parts?

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Dontwannabehot

HECAT on Thu April 01, 2010 7:21 AM User is offline

For a better understanding on how to flush; read the tech paper in my signature.

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