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When I bought my 1992 Eldorado a year ago the air conditioning didn't work so I don't know the last time it worked.

When I turn the auto climate control on, the readout on the dash says low refigerant compressor off.

I tried filling it up last summer with some refrigerant I bought off of ebay but it didn't work because I don't think I did it right.

I'd like to get this to work without spending $1000 to take it somewhere and have someone do it. How hard is it to diagnose and fix an airconditioning system?
 

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i had the same problem on my 99 eldorado this spring.. it was low on freon so computer wouldn't let compressor engage to add freon.. well my battery just happened to go bad also.. so when i disconnected battery to put new one in,it reset the computer. so i hooked up the gauges and r134 before engaging ac again. and presto when i tried this time compressor engaged and added freon and works great now!!!!!
hope this helps
 

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2007 EXT Supercharged
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you dont have to disconnect the battery...just clear the ac code and it will let it kick in next time you start the car, just be sure to start filling once you push the auto button.
 

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2003 Cadillac Seville STS 73k Miles, '90 Chevy 1500 Reg Cab
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Well first you're going to need a set of gauges, not the single gauge that comes on the easy fill cans, the actual set of manifold gauges with 2 pressure gauges for Hi/Low side and shutoff valves and a fill line. That will allow you to hook up and actually read the Hi/Low side pressures and be sure that it is just low on freon instead of potentially something else. Also not sure what year they started making the switch from R-12 to the more "environmentally friendly" (read as doesn't work as well) refigerants, but if yours is R-12 it could cause some problems as you can't get that stuff anymore with an HVAC license and its about 100 bucks a pound last time I heard. They do make some newer stuff that works for multiple system types, and also some conversion kits to convert an R-12 system to 134a or similar, however those kits require cracking open the system, at which point you also should replace out the dryer, as well as requires a vac out in order to recharge.

In a rather rambling way what I'm getting at is that if you really want to be sure that you're going down the right path for fixing you need a set of manifold gauges to be sure. Now it may be that its just low, and a can of freon will do it, however at this point its hard to tell. Whichever way you go, when you go to charge the system you will need to reset that code so the AC compressor can cycle on, you can't charge without the compressor cycling on and off, and if you do go ahead and get the ready to charge kits at the big box retailer or auto parts store, I would avoid the stuff with "leak stop" or similar names....I don't know the details but all HVAC techs and mechanics I know who work on AC a lot say to stay the hell away from it, all its going to do is cause seal failures in the future and cause longer term, large dollar repairs. If you drop a can in and it fixes the problem temporarily but the error comes up again in a week or two, buy a can with a leak tracer(UV dye) to help pinpoint the leak in the system.
 

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eehhh...

its not quite rocket science.....

i did 5 or 6 conversions before i had a set of gauges.....all worked fine.

The instructions (if followed properly) on the retro fit kit is pretty good and will work most of the time.

My 94 now leaks almost a cans worth a year......no point in fixing it really...

and r-12 is about $25 a pound....not $100

r-134a went way up now....to like $8 a can

dont mix any refrigerants and stay away from ones that can be added to either kind and use the right comp oil for each refrigerant.
 

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My A/c worked fine thru last fall, but nothing on first try this season.
I tried adding a can of 134a. The gauge shows pressure while it seems to be filling, but then goes back to 0, and doesn't want to take the whole can.
The compressor never cycled on. From reading here, maybe I should reset all codes and try again?
Or maybe it really is leaking out as fast as it's going in?
190k miles.
 

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2003 DeVille DTS
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My A/c worked fine thru last fall, but nothing on first try this season.
I tried adding a can of 134a. The gauge shows pressure while it seems to be filling, but then goes back to 0, and doesn't want to take the whole can.
The compressor never cycled on. From reading here, maybe I should reset all codes and try again?
Or maybe it really is leaking out as fast as it's going in?
190k miles.
Update: Unless my ears deceive me, it's leaking out. Assuming it's the compressor seal, how hard to replace the compressor, and what prep/follow up is required? (New A/C Delco available for $391 w/ free shipping.)
 

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White Diamond '03 DHS (with DTS floor shift)
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The compressor is underneath and is no picnic to replace.
 

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kjd, you can buy r134a with a dye in it. That way, you can be sure where the leak is. Yes, you should reset all your ACM codes before adding refrigerant. You have about a minute to add more once you engage the system.
 

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Update: Unless my ears deceive me, it's leaking out. Assuming it's the compressor seal, how hard to replace the compressor, and what prep/follow up is required? (New A/C Delco available for $391 w/ free shipping.)
Don't replace it by your own hire a professional ac repair specialist and replace it from them.They will not charge more for their service but it can reduce the risk of wrong installation of compressor.

Spam link deleted by Ranger :tisk:
 
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