Question about 1990 Chevrolet Suburban

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Ac not cold replaced compressor

All new ac parts and added 2 cans r134 but still no cold air

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  • jessagee74 Jun 25, 2009

    compressor comes on, but did not to vacum, how is that done, is it to late to do it or can i relieve the pressure and start over

  • jessagee74 Jun 25, 2009




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134 is not an ozone depleter. if it were you wouldn't be able to buy without a universal epa certification. you cant reuse it either if its been mixed with air. yes you can vent it and start over. or just go to an automotive ac specialist.

Posted on Aug 29, 2009

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First the a/c system need to be put into a vacuum before you add r134. how much r134 does you system need? too much or too little will both get you warm air. does the compressor come on? air in the system will get you warm air too.

good luck

Posted on Jun 25, 2009

  • Aaron Murchison
    Aaron Murchison Jun 25, 2009

    it's against the law to vent r134 to the atmoshere because it breaks down ozone. you need an a/c machine to put the system into a vacuum anyway so they might as well collect what's in there and reuse it at the same time.



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1 Answer

Ac doesn't blows cold air.

Low on r134 or whatever it uses. First check that your ac compressor clutch is engaging if it does than its just low in most cases. Otherwise ur compressor clutch may not be working.

May 01, 2017 | AC Cars & Trucks

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I have a 2007 tahoe , this morning the ac was working fine and blowing cold air ,now that I turn on the ac it only blows hot air ...what can I do to get it fix ?

You could check to see if the compressor is running.. Thats the way things break.. they just stop working.. Take the car to an A/C shop and get an estimate to fix it.. Play dumb and let them tell you what is wrong. They will tell you what is wrong.. Might try 2 or more shops and see if they all tell you the same thing.. Might be as simple as the switch.. of maybe a Compressor or a compressor clutch.. If the compressor needs to be replace.. there is the compressor, dryer, expansion valve, flushing the system and replacing the R134. NOT CHEAP..

May 26, 2014 | Cars & Trucks

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My 2001 sienna air conditioner is blowing some cold air but could be colder. Can I just replace freon?

A lot of your local parts stores sale a hand held device that you pull the trigger on with it hooked to you ac line and it will tell you if it is low or ok or over charged. It comes with a can of R134 and I think it was around $40 but it is well worth it so you don't over fill andlock up your AC pump

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2 Answers

How many pounds of r134 and how much oil ozs.

somewhere around 1.6 pounds (1lb.14ounces) of R134a if system is evacuated and 3 ounces of oil with new compressor.
keep pressure on the low side around 34-37psi & it should blow snow. Below are normal car AC pressure readings with 134A.
  • Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
  • Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI –
  • Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor.
DIY recharge kit:
With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold – STOP don’t overcharge the system.
Thank you for using fixya and be safe.

Jul 19, 2010 | 1994 Chevrolet S-10 Blazer

1 Answer

A/c hot!

Possibly. Make sure you didn't overfill it. It will not work if there is too much R134 in the system.

If starting from scratch. Turn engine on with AC on Max. Add 1 can first, and the compressor should start to cycle and the air should begin to cool. Add the next and the compressor should run almost consistently. You should get cold air by then and you have enough R134 in it to work well. If that doesn't cure you, then you will have to trust their diagnosis.

REMEMBER. Do not hold the can upside down. Instead, keep switching the can from the 10 o'clock position to 2 o'clock and back. Holding it upside down will also lock up the A/C, as it is being filled with liquid, instead of gas. Liquid does not compress.

Jun 10, 2010 | 2006 Chevrolet Aveo

1 Answer

My air conditioner is putting out cold air for a few minutes then it's warm for 5 minutes and then it's getting cold again? I had the compressor changed by a mechanic who wasn;t sure how much freon it...

OK, the requirement of Freon is 2 for the Cold/Hot problem, a little info first; the PCM controls the AC clutch (adjusts the IAC, Idle Air Control valve to speed up the idle when turning on the AC unit, and slows down the idle after turning off the AC unit), also the PCM controls the relay that cycles the AC clutch. My experience has been that the relay is "going South". This bad boy is in the fuse block in the engine compartment by the Air Filter box. The relay is an inexpensive item, and if you live where the AC unit is used frequently, I would recommend it being replaced every 3-5 years. Be sure to check with the mechanic to make sure he properly recharged the system, and if so, try these ideas.

Jan 18, 2010 | 1996 Saturn SL

1 Answer

My air con does not deliver cold air. I had it diagnosed by an air con specialist who said the compressor had an open circuit fault and needed to be replaced. My local garage replaced the compressor at the...

to hear things like this really bugs me why would any mechanic replace a parts not knowing that is the problem and call them self a mechanic. Going to give you the best run down as I can think of, and at least we know now you have a new compressor and we can leave that out as the problem.
1 check for leaks, If no pressure your compressor will not run. a dye can be added when charged the
system to see any leaks may exist by using black light.
2 check pressure switch & pressostat making sure is not faulty, if it faulty, the switch will not sense
any pressure to kick the compressor on.
3. check AC fuse, making sure is not blown, if blown no power to ac switch
4. check AC relay, making sure is good relay, bad relay compressor will not work or kick on.
5. Make sure your have no moisture or air in the system, system will not operate up to 100% if any
of those items exist in the system, best way to charged the system is to vacum the system out
first removing any moister and air in the systems, keep in mind, air is 02 can convert into
moister/water molecules if its cold enough.
6. expansion valve faulty, this unit usually goes out like compressor do. it sense the temperature,
regulate refrigerant flow to evaporator. everything may run and operate correctly, if this unit goes
bad it will restrict refrigerant flow cycle and evaporator will not get cold.
I would replace number 6, eventhough if its not bad, it need to be place regardless because of the year of your vechicle, cost 5 bucks. Note: My guess, when you push the ac button do you hear the compressor kick on, if not my guess would be 1 and 2. replace.. If your compressor is running than it would be no. 6 and make sure you have lots of feon in the systems. good luck, hope that help some.

Jul 10, 2009 | 1998 Volvo V70

1 Answer

AC does not work

Check the fuse for the A/C and try refilling the A/C with R134. You can buy the re charge kit at Auto Zone or Wal Mart, almost any Auto parts store. If the system is low on R134 the A/C compressor will not activate to keep it from burning out.
Try checking the fuse first then re charge the system with a can 12oz of R134. Just keep in mind not to over charge the system. Just follow the instruction and you'll be fine.
Keep me posted, be glad to help out.

May 31, 2009 | 2004 Chevrolet Silverado 2500HD

2 Answers

Air cond.

When you start putting the freon in the compressor should kick on and then start pulling it in. Yes it will cycle, as long as all the lights aren't flashing on the temp control.

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1 Answer

I have charger the air condition an sitt will not get cold

I am the original owner of a 1998 Ford Escort SE wagon. The summer of 2008 I had problems with my A/C system - the first A/C problem on this vehicle. Be careful that you do not over-charge your R134-A system.
1. Check that the A/C Compressor Clutch engages and drives the compressor properly (via the
serpentine drive belt and proper engine idling speed, A/C switched "on" etc.). If the A/C
compressor clutch doesn't engage and drive the compressor you will not be able to charge the
system to the correct refrigerant capacity and operating pressures.
2. You should be familiar with and have the proper tools to test & troubleshoot your auto's A/C
system. Test gauge(s), hose & connector's will be needed.

If the A/C compressor clutch does not engage the compressor, then you will need to troubleshoot the electrical system and components related to your auto's A/C system. This can be time consuming and requires more skill and information (accurate electrical schematics, etc.).

My problem:
1. A/C clutch didn't energize and engage.
2. System slightly low on R134-A, about a 7 oz. charge was needed after all was taken care of.

1. Electrical problem in the electronic controls for the A/C system. The "Contant Contol Relay
Module" (Ford part no. 3S4Z-12B577-BA, RELAY) had to be replaced. Sometimes Ford calls
this "black box" unit an "Integrated Control Relay Module". The location of this "black box" on my vehicle is under the engine intake air filter housing - replacement cost (new) is about $230;
(used) about $35.
2. Charged the required amount of R134-A into the system via the proper test gauge and related
Please note: I have experience and training in mechanical (including refrigeration systems) and electrical systems.

Apr 25, 2009 | Ford Escort Cars & Trucks

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