1996 Toyota Tacoma Logo

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Anonymous
Anonymous Posted on May 07, 2017
Answered

When doing an Evac of the AC system where do you hook up the vacuum pump to the high side or low side fitting. The vehicle has to not be running also, right? I just replaced the AC compressor, the accumulator, the orifice tube, I flushed the system before installing the new parts, and I added the oil, now all that's left is evacuating the system, making sure it doesn't have any leaks and that it holds pressure, and then recharging the system. But I need to know where to hook up the vacuum pump. The system is a R-134a 1996 Toyota Tacoma.

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Bill Boyd

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  • Toyota Master 53,816 Answers
  • Posted on May 07, 2017
Bill Boyd
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Any charge port will evac the system
the compressor will not be running
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

5 Related Answers

shaggyrat

Christophe Thompson

  • 1224 Answers
  • Posted on May 20, 2008

SOURCE: air condition

Check the cooling system, particularly the radiator to make sure it is not partially plugged. Additionally, check the radiator fan for proper operation. If the engine temperature is running way above normal, some of the heat is transferred to the air-conditioning condenser, which causes the air-conditioner to lose efficiency. As for your question about a "limiter" switch, there is a high-pressure switch in the air-conditioning system that cuts the compressor out when the pressure gets too high.

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Anonymous

  • 23 Answers
  • Posted on Oct 03, 2008

SOURCE: location of orifice tube in 2004 ford taurus

orfice should be located on the accumulator, where the large line connects.

emissionwiz

Marvin

  • 85242 Answers
  • Posted on Jan 20, 2009

SOURCE: Replacing Accumulator in 1993 GMC

the orfice tube goes in the high pressure line, that is the small line near the accumulator, disconnect that line and the orfice is in the accumulator inlet tube, u may need an extra long nosed needle nose pliers to extract it.

Anonymous

  • 64 Answers
  • Posted on Mar 28, 2009

SOURCE: Orifice Tube for 2000 Impala

Does it have crimp marks on the tube about 3 inches from the fitting?If so,that's where the orifice tube is.Most of the time,you simply disconnect the fitting,pull out the orifice tube & install a new one.Tip:if it has a lot of black junk on it,flush the system or you will end up having the same problem again very soon.Good luck,
ChevRev

lilmikew99

michael

  • 122 Answers
  • Posted on May 11, 2009

SOURCE: Need location of Low and High pressure ports for Air Conditioner

it will be in the line itself, the larger line, it will look like an inflater for a tire,should have a black plastic cap on it

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I have a 2004 Mountaineer and it has two ports for the AC system as far as i can tell. I have a refil guage and hose for adding 134a and it should only fit the low pressure side but when i hook it up it...
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I have replaced my ac compressor w/ a new one and two reconditioned compressors and they have all gone bad within a month. 1996 izuzu rodeo
When the A/C compressor was replaced and recharged, was the system vacuumed and the accumulator and orifice tube (expansion valve) replaced too. Also was the right amount R134a in the system to run properly??
To diagnose problems, an A/C manifold gauge set is needed to read high and low side pressure readings. Avoid adding refrigerant with a simple charging kit like the ones sold at parts stores. Don’t add any stop leak, this can cause problems in the compressor, expansion valve or condenser.

 Keep in mind that using an A/C gauge set and seeing BOTH high and low side readings can help in diagnosing the problem when you know what to look for. First, on a 134A system the high and low side service ports are different sizes. AC gauge sets have color coded hoses, the blue color coded hose has a connection that fits on the low side service port and the red hose has a connection that will only fit onto the high side. The yellow hose won’t hook up to anything if just checking the readings; it can be used to connect to a vacuum pump or attached to a refrigerant can or tank.
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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. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system. And actually the best way to insure the proper charge is in a system, is to use an AC machine to recover the R134a and then evacuate and recharge the system with the correct amount. Most cars have the specified amount on a decal under the hood.
Both low and high side readings are lower than normal, this indicates a cars AC system is low on refrigerant and is under-charged. If both low and high side readings are too high, this indicates an overcharged system - too much refrigerant. This also can indicate that the condenser fan is not working, is too slow or the car is overheating and heat is transferring from the radiator to the condenser. 
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When the compressor clutch is definitely engaged and the low side is high and the high side is low, the most likely cause is that the compressor is failing - it is not pumping sufficiently. Rarely an AC clutch could be slipping but usually this will be accompanied with a squeal or chirp.
I hope this will help you understand why the comprssor failed, Keep me posted, be glad to help you get your A/C running 100% again. 
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Jul 07, 2009 • 1996 Isuzu Rodeo
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Ac wont get cold after adding refrigerant
To diagnose problems, an A/C manifold gauge set is needed to read high and low side pressure readings. Avoid adding refrigerant with a simple charging kit like the ones sold at parts stores. Don’t add any stop leak, this can cause problems in the compressor, expansion valve or condenser.
Keep in mind that using an A/C gauge set and seeing BOTH high and low side readings can help in diagnosing the problem when you know what to look for. First, on a 134A system the high and low side service ports are different sizes. AC gauge sets have color coded hoses, the blue color coded hose has a connection that fits on the low side service port and the red hose has a connection that will only fit onto the high side. The yellow hose won’t hook up to anything if just checking the readings; it can be used to connect to a vacuum pump or attached to a refrigerant can or tank.
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 - Note that on many Chrysler products a normal reading on the low side may be 15-25 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.
Both low and high side readings are lower than normal, this indicates a cars AC system is low on refrigerant and is under-charged. If both low and high side readings are too high, this indicates an overcharged system - too much refrigerant. This also can indicate that the condenser fan is not working, is too slow or the car is overheating and heat is transferring from the radiator to the condenser.
When the low side goes so low that it’s reading shows it is in a vacuum, the most likely cause is a bad expansion valve or blocked orifice tube. Another possibility is a restricted condenser. Blocked condensers are not as common as they used to be but if a compressor fails and comes apart inside the remnants can end up in the condenser causing it to restrict the flow of refrigerant. 
When the compressor clutch is definitely engaged and the low side is high and the high side is low, the most likely cause is that the compressor is failing - it is not pumping sufficiently. Rarely an AC clutch could be slipping but usually this will be accompanied with a squeal or chirp.
Hope this helps. If the compressor did come on and pulled the R134a in to the system, you may still be low or you may be over charged. With out any pressure readings it's had for me to say what is the problem. You could also have a bad orifice tube ( expansion valve) Good luck and hope this helps. 
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Jul 03, 2009 • 1998 Ford Windstar
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95 Deville - Low Refridgerant/AC Comp. off
To diagnose problems, an A/C manifold gauge set is needed to read high and low side pressure readings. Avoid adding refrigerant with a simple charging kit like the ones sold at parts stores. Don’t add any stop leak, this can cause problems in the compressor, expansion valve or condenser.
Keep in mind that using an A/C gauge set and seeing BOTH high and low side readings can help in diagnosing the problem when you know what to look for. First, on a 134A system the high and low side service ports are different sizes. AC gauge sets have color coded hoses, the blue color coded hose has a connection that fits on the low side service port and the red hose has a connection that will only fit onto the high side. The yellow hose won’t hook up to anything if just checking the readings; it can be used to connect to a vacuum pump or attached to a refrigerant can or tank.
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 - Note that on many Chrysler products a normal reading on the low side may be 15-25 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.
Both low and high side readings are lower than normal, this indicates a cars AC system is low on refrigerant and is under-charged.
 If both low and high side readings are too high, this indicates an overcharged system - too much refrigerant. This also can indicate that the condenser fan is not working, is too slow or the car is overheating and heat is transferring from the radiator to the condenser.
Good luck and hope this helps, keep me posted be glad to answer any question you may have. And yes the A/C system on your car uses R143a and there is a A/C pressure switch along the low pressure line or on the accumulator, it looks like a oil pressure sensor with a two wire lead cliped on it. 
Read full answer
Jul 02, 2009 • 1995 Cadillac DeVille
1helpful
2answers

AC Wont charge after replacing components
whenever the ac system has been opened it should be hooked up to a vacuum pump designed to evacuate the ac system of any foreign debris and oil etc and after should be able to hold a vacuum to show that there are in fact no leaks then if all is ok at this point you can then charge your ac with the proper freon specified for you car when the pressure reaches satisfactory level the ac compressor will then cycle on you should not bypass the low pressure switch
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