AC Line into block

[sethturbo]

93 chevy k2500 5.7 6 lug r12 system

Hi,
So i just purchased some envirosafe r12 online and plan on trying to recharge my truck that hasn’t had ac since i bought it . Just doing a basic run over of the ac system i can see a few things wrong already. The super thick line that comes out of the firewall and into the block has a lot of corrosion where the fitting is. so i need to know the name of that line to replace it cause i assume it has something to do with the ac. Second thing is it looks as if my lines to my condenser have been modified? just need to know what the next step is in righting the previous owners wrongs .

Please help Thankyou!

Pictured: line out of firewall with corrosion on block end , Lines running into what i think is the compressor

 

[movietvet]

The first line is a heater hose coolant line/hose. Where it comes out of the firewall, is the heater core. The other lines/hoses are transmission cooling lines and that is an add on transmission cooler in the front.

That heater hose/coolant line quick connects in to a fitting at the block/intake. Those are notorious for corroding so badly that they break. IMO, with your obvious lack of knowledge about a/c-engine cooling-transmission systems, it is best that you leave the work to someone trained and knowledgeable. Don't take this wrong, just accept that you lack knowledge and need training.

 

[sethturbo]

The first line is a heater hose coolant line/hose. Where it comes out of the firewall, is the heater core. The other lines/hoses are transmission cooling lines and that is an add on transmission cooler in the front.

That heater hose/coolant line quick connects in to a fitting at the block/intake. Those are notorious for corroding so badly that they break. IMO, with your obvious lack of knowledge about a/c-engine cooling-transmission systems, it is best that you leave the work to someone trained and knowledgeable. Don't take this wrong, just accept that you lack knowledge and need training.

I’m not oblivious about the lines. I’ve owned this truck for about a year know and have redone its front end, brakes. and a few interior components along with some motor upkeep and preventative maintenance. I had previously thought it was a trans cooler but got over that thought due to thinking only the 4l80s came with trans coolers. admittedly i should have taken a closer look at the lines but it definitely looked like those two lines should be plugged into the radiator with the two outlets there. i’m not gonna replace the heater line as of now. So the only ac lines on our trucks are the two that come in a set from the compressor? looking into buying new lines when i put new refrigerant in.

 

[sethturbo]

The first line is a heater hose coolant line/hose. Where it comes out of the firewall, is the heater core. The other lines/hoses are transmission cooling lines and that is an add on transmission cooler in the front.

That heater hose/coolant line quick connects in to a fitting at the block/intake. Those are notorious for corroding so badly that they break. IMO, with your obvious lack of knowledge about a/c-engine cooling-transmission systems, it is best that you leave the work to someone trained and knowledgeable. Don't take this wrong, just accept that you lack knowledge and need training.

Definitely not 100 percent on knowing all the lines on this truck yet. definitely have things to learn. but i mean it’s a obs the ac is probably the most complicated thing on it. I have a chevy colorado which i normally work on so the obs seems so simple in comparison

 

[jd33173]

The first line is a heater hose coolant line/hose. Where it comes out of the firewall, is the heater core. The other lines/hoses are transmission cooling lines and that is an add on transmission cooler in the front.

That heater hose/coolant line quick connects in to a fitting at the block/intake. Those are notorious for corroding so badly that they break. IMO, with your obvious lack of knowledge about a/c-engine cooling-transmission systems, it is best that you leave the work to someone trained and knowledgeable. Don't take this wrong, just accept that you lack knowledge and need training.

Dude is asking about his ac on his truck. Plenty of info here and plenty of people to help figure stuff out.

 

[east302]

So the only ac lines on our trucks are the two that come in a set from the compressor? looking into buying new lines when i put new refrigerant in.

There’s also one from the condenser to the evaporator. Here’s the system schematic.

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The 93 GM manuals can be downloaded here for free and have all of the details on the system:

88-98 Service Manuals

Over the years I have collected a bunch of GM service literature. Links to PDF Scans of service and STG manuals and a links to the Parts manuals. You'll need the FREE Adobe Acrobat reader to open these files. Get it directly from Adobe here {http://get.adobe.com/reader/} If you're not...

www.gmt400.com

The accumulator should be replaced when the system is open, so heads up that its connection to the evaporator at the firewall may be seized. If it twists and breaks the line, you’ll need a new evaporator. Same for the evap inlet fitting.

That generally means that you’re pulling the dash to get to it. On the plus side, you can then replace the leaking dampers and reseal the air box.

 

[GoToGuy]

Get the service manual and read up AC , learn a little about the system and the operating parts first. Does it have R134 conversion fittings? How long has it not been operational? Do you why it's not working? Have you ever brought a dead system back to life? Leak, check, vacuum down , reservoir? The Factory service manual is available in the sticky above, link to PDF for your year download.

 

[sethturbo]

Get the service manual and read up AC , learn a little about the system and the operating parts first. Does it have R134 conversion fittings? How long has it not been operational? Do you why it's not working? Have you ever brought a dead system back to life? Leak, check, vacuum down , reservoir? The Factory service manual is available in the sticky above, link to PDF for your year download.

First time messing with ac. No clue how long it’s been down. i’m the third owner and i know the second owner bashed it a bit. r12. in terms of fitting i don’t think so everything looks stock and the compressor says r12 so i figure its that. I’ll read up on the manual before i attempt anything. thankyou

 

[GoToGuy]

That's because 93 was the last year with factory R12. 94 and up are factory R134. Compressor doesn't care about refrigerant, but you must use lube oil that is compatible with refrigerant you use. Using the service manual , gets you ahead of the game. As you said your new to this, avoid guessing.

 

[movietvet]

Dude is asking about his ac on his truck. Plenty of info here and plenty of people to help figure stuff out.

Every one of my answers was to address what was obvious in the pics. My recommendations was to keep someone from opening a possibly pressurized system.