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Replaced AC Condenser and Evacuated System.. Holds negative pressure but when adding the freon after the oil all the freon doesnt seem to empty out of the can. And noticed that the Compressor hasnt engaged.

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When you add the freon turn the can upside down and it will push the oil and freon out of the can. If you have it up it sends freon but no oil.
You also may need more freon before the compressor will kick in.

Posted on Jul 19, 2009

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Sometimes if you get a pieces of wire strip both ends so coppper is showing and you jump the postive and negitive wires on the compressure's wire conector with the wire you striped while vehicle is running it will make the system turn on

Posted on Jul 19, 2009

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SOURCE: Replaced AC Condenser and Evacuated

compressor needs time to circulate the refrigerant and for the refrigernt to heat up and cycle through the low pressure hi pressure side compressor will kick on and off and the only thing you will notice is the rpms or load on the vehicle will increase

Posted on Jul 19, 2009

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1 Answer

Condenser fan not engaging when A/C turned on. All fuses and relays look fine. Tested fan with eternal power and it runs.


Possibly low on refrigerant. When system is low on freon, it does not build up enough high side pressure to engage the condenser fan . When pressure is high enough. a high side pressure switch kicks on the cond. fan to maintain high side pressure. Have the system evacuated and recharged to proper level. A system dye can be added to check for any possible leaks.

Feb 01, 2014 | 2004 Isuzu Rodeo

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Replaced AC Condenser and Evacuated System.. Holds negative pressure but when adding the freon after the oil all the freon doesnt seem to empty out of the can. And noticed that the Compressor hasnt...


The car has a specific amount of Refrigerant in the lines and does need time to warm up to begin the cycle on and off so make sure you have the proper amount of refrigerant and give the compressor time to kick in

Jul 19, 2009 | Dodge Dakota Cars & Trucks

1 Answer

2008 legacy air conditioner was blowing cool air but not cold I added one can 134a on low pressure side with motor running ac on high cold now it only blows hot air


I highly recommend that you get it checked by a professional. You may have a restriction in your system, or the system is way overcharged. In either of these cases, the possibility of high pressure causing lines or hoses to burst and possible severe damage to your vehicle, like a destroyed compressor, is very likely.

Also, check the can that you added freon from. Many of the small cans of freon sold at the local parts retailers have several ounces of "oil charge" in them. Many times, when these cans are used to fill the system, the system ends up saturated with too much oil, which can also cause dangerously high head pressures, which can result in severe damage to your vehicle. In these cases, the system must be evacuated and flushed out to reduce the amount of oil in the system before it will cool properly.

Jun 14, 2012 | 1995 Subaru Legacy

1 Answer

2002 Tahoe with rear air. How much freon does the a.c. system hold?


Hi
It holds 3.0 pounds when completely evacuated. Be sure to use R134a refrigerant with oil added, it is needed in the system for lubrication.

Please vote if this helped! Thanks, Mike

Jun 12, 2011 | 2002 Chevrolet Tahoe

1 Answer

Evacuated system but ac will not run when recharging.


When you evacuated the system, did you also vacuum it so that it has and holds 30 In/v? If it is not under vacuum, you may have to over ride the low pressure bypass by bridging the wiring to get the clutch to engage, but after you have added about 24 oz. of 134a I would think it should cycle-don't forget you also need to add about 6 Oz of PAG oil if you did really vacuum it out.

May 31, 2011 | 2005 Dodge Grand Caravan

1 Answer

Hi, I have 2000 Toyota Sienna, after using the AC for some minutes its cut off and never cool again till I switch it off and on it later. I just replace the condenser and re-fill the gas. What could be...


The catalytic converter has no bearing on your air conditioning system. If the compressor is shutting off, it is because of inadequate freon, or air and moisture in the system. When you replaced the condenser, the dryer should have been replaced with a new one. The system should have been completely evacuated of any old freon and fresh freon and oil put back in the system. If the a/c guy didn't change the dryer, then the system has been contaminated with whatever was accumulated inside the old one. If your catalytic converter is bad, the computer will trigger trouble code and the check engine light will come on. Have ethe computer scanned for trouble codes.

Jan 14, 2011 | 1998 Toyota Sienna

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

Replaced AC Condenser and Evacuated System.. Holds negative pressure but when adding the freon after the oil all the freon doesnt seem to empty out of the can. And noticed that the Compressor hasnt...


compressor needs time to circulate the refrigerant and for the refrigernt to heat up and cycle through the low pressure hi pressure side compressor will kick on and off and the only thing you will notice is the rpms or load on the vehicle will increase

Jul 19, 2009 | Dodge Dakota Cars & Trucks

1 Answer

2002 Saturn not cooling


well you cant just put refrigerant into a system. 1st you had a broken line . so the compressor probally pumped all its oil out and you lost the gas. 2 after such an incident you have to have the system evacuated to remove all the air out of the lines and system. if there is any air or moisture in there it will not run right due to freezing and without oil in there you will destry your pump . i suggest that you take it to a garage and get it evacuated be fore you proceed. then you can refill it. also on your vechile it should tell you how much goes in there like 1lb 6oz and there is an amount written on the can so go by that. putting more in there will do more harm then good and cause alot of headaches and sweating. good luck have a good day

May 06, 2009 | 2002 Saturn L-Series

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