Question about 1996 Cadillac DeVille

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Replaced ac compressor,dryer,orifice tube, evacted and charged 134A system on 1996 Deville. AC blows cold until computer shuts it down. Can reset by disconnecting battery but it shuts down again especially when it's hot out.

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As you have charged the system with 134a refrigerant.But did you checked for any leakage of refrigerant in the system. Ac stops running on hot conditions this indicates few possibilities. Check the refrigerant level in the compressor of car ac.If its low then car will compressor will overheat and stops running. Also check the coolant level.If its low then it needs to be full.Also check if there any leak of the coolant.Get the ac pressure test done.It can be done at any local car garage.This will confirm whether there is refrigerant or coolant leak in the system causing the ac to stop after sometime.If coolant and refrigerant all checked OK.Then the thermostat needs to be checked.When the car temperature reaches certain temp the cooling fan turn on and cools the thermostat.But if the cooling fan stopping after ac turns off then thermostat needs to be checked.Also connect the fan connections to car battery and check if the fan is running directly.Check the voltage at fan terminals.It should show exact 12 volt.If less then that then fan is faulty and needs replacement.If fan tested OK then thermostat needs to be checked and replaced.Also check the coolant temperature sensor.If this sensor is not working then this will make the vehicle overheat and this will stop the ac and it stops running.---------- Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Aug 07, 2010

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How do i locate the failing part for ac not working


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Im working on a1988 Cadilac deville , replaced ac compressor , accumlator , orfus tube . i also vaccumed the system , reset computer . started car filled with 134a . worked fine till i drove for bout 1mi ....


Your have a low refrigerant level. Econ staying on and service ac will stay on too. Sounds like you didnt put enough r134a in the system. How much r134a did you add? Capacity is 38 ounces(thats
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My ac was blowing fine and cold until my ac compressor went out. i bought a used ac compressor wit new dryer/accumulater, and orfice tube. i had that for awhile and i replaced it again because the air...


If the car was retro fitted with R134a this was a common problem. There was a low side pressure sensor that needs to be changed. R134a runs different pressures than the r12.. When you go down the road the condenser cools off the system and the pressure drops below the minimum pressure. You need to make sure that the system is fully charged, not just cold to the feel. Both pipes coming out of the firewall need to be the same temp. this makes sure that the evaporator is flooded.
I hope this helped. Re-post if you need more info. Have a nice day and good luck.

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There's not really a diagram for the actual removal and installation. A good repair manual might list steps like these: First, your system needs to be purged of the freon. Next, unplug the AC clutch/pulley assembly at the front of the compressor. Remove the belt, then the AC lines on the compressor (usually in the back), then unbolt the AC from any mounting bracket(s) and remove. To avoid having to press on and off the clutch/pulley assembly you might want to make sure you're buying a complete compressor assembly. Read and follow those directions concerning oil for the compressor. After installing the new AC, reconnect the lines with new "O" rings. Most if not all compressor manufacturers will not honor any warranty unless you change out your orifice tube (also called an expansion valve) and accumulator (aka the dryer) at the same time. Recharge the system with the appropriate amount and type of freon, most likely R-134a.

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any charge port will evac the system
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adding oil is not necessary as there is enough in the replacement compressor
run the vacuum pump for a couple of hours and then lock of the system to see it it holds vacuum

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Air compressor wont come on to to put in 134a


The AC compressor does not have to be running to charge the AC system, and the low pressure switch will even prevent the AC compressor from operating until there is sufficient pressure to operate the AC compressor without damaging it.

Start the engine and turn on the AC, then charge the system with the R-134a and as soon as there is enough pressure built up to trip the low pressure switch off, the AC compressor clutch should then engage and then finish charging the AC system.

May 31, 2010 | 1997 Cadillac DeVille

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My ac does not blow cold in my 97 cadillac deville but it does blow just not cold and its n ot the fuse what can i do?


You probably have leaked out your freon after so much time. Try adding some more Freon if it doesnt stay charged you may have bigger issues.

Jul 08, 2009 | 1997 Cadillac DeVille

1 Answer

What do I have to do to change the a/c compressor are there any special procedures or can I take the old one off put the new one on and then charge the system with coolant I have a 1996 oldsmobile delta...


if old compressor fail your air condition has to be discharge at dealership or a garage that does ac repair.then the ac lines has to be flushed out before putting on new one. because old one when it fails clutch lock up or compressor fail.small metal particles get in line.stop up orifice tube.you will have to replace orifice tube the accumalator .you will need vacuum pump to pump down air conditioner .to get moisture out of system.you will need a manifold gauge set for air conditioner.ac tools are expensive.it would be cheaper to buy compressor - accumulator - orifice tube. take it to a good air conditioner mechanics.let him put parts on and pump down system.then charge it up.because buying tools to get ac going .is going to cost $475.00 thats the vacuum pump price.you can buy a cheaper vacuum pump that works from air from a regular air compressor you pump tires up with.manifold gauge set causes from $100.00 up to $300.00 for a good set.another thing you have to be familiar with working on air conditioners you put too much R-134 in system you will damage compressor or get seriously hurt.

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