Question about 2005 Infiniti G35

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Hello ! On 03 G35 we replaced compressor , but after recharge a/c system there is not enough cold , around 16-17'C . The pressure on low side around 50 PSI, High side - 150 PSI. Any idea ? Thank you

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Did you replace the dryer/receiver, evacuate the system and then add the correct oil charge?
Your pressures look too high which will result from over charging and prevent adequate cooling.
Frequently, a failed compressor will release shavings into the system and thsoe will clog the orafice tube requiring replacement.

Recover any R134A and clean and recycle it through the correct equipment. It's worth hiring professionals.

Posted on Jul 02, 2009

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Posted on Jan 02, 2017

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A/C compressor does not kick on...Compressor OK !!!. Thanks Juan


If the refrigerant level is low (or if it is too cold outside), the system pressure will not be high enough to cause the low side pressure switch to turn on the compressor. Check level of refrigerant by making sure there is at least 40 lbs pressure on the low side when the compressor is not running.

Sep 23, 2013 | 2001 Ford Explorer Sport

1 Answer

2007 ford KA blowing hot air


see this causes and fix it. God bless you
Compressor Checks
checkmark.gif Start with the compressor. Does it engage when you turn on the A/C?
If so, the compressor is working and the A/C system probably contains enough refrigerant to make cold air, so the problem is inside the HVAC unit. Replace the motor that controls the blend air door (this is a difficult job and best left to a professional since it involves tearing apart the HVAC unit -- about an 8 to 10 hour job!).
If the compressor does not engage when you turn on the A/C, see if it will run by jumping the compressor clutch wire directly to the battery (use a fused jumper wire). If the compressor works when you jump it, and the A/C blows cold air, the system contains refrigerant and the fault is likely a bad A/C compressor clutch relay or a bad clutch cycling switch or pressure switch.
If the compressor does not engage when you jump it, the problem is a bad compressor clutch.
If the clutch engages but the compressor does not turn (the belt will start to slip and squeal), the compressor is locked up and you need a new compressor.
If the compressor clutch engages and turns the compressor, but the A/C still does not blow cold air, the system is probably low on refrigerant and needs to be recharged.
Refrigerant Checks
checkmark.gif Connect an A/C pressure gauge to the HIGH SIDE service port (located in the high pressure hose that runs between the compressor and the condenser in the front of the engine compartment). The gauge will tell you if there is any pressure in the system. Simply depressing the service fitting valve with a small screwdriver to see if any refrigerant squirts out is NOT an accurate check because it tell you how much pressure is in the system. It may still have some pressure but not enough to trip the low pressure safety switch so the compressor will engage.
If your A/C system is low or out of refrigerant, check for leaks, then have the A/C system vacuum purged to remove air. After the air is out, it can be recharged with the specified amount of refrigerant. It is important to get any air out as this will reduce cooling efficiency and may make the compressor noisy.
A/C System Functional Checks
checkmark.gif If the refrigeration circuit seems to be working (refrigerant in the system, compressor running and building pressure), but there is still no cooling, the problem might be an obstruction in the orifice tube (located in the high pressure hose between the condenser in the front of the radiator, and the evaporator located in the passenger compartment). A blockage here will prevent the refrigerant from entering the evaporator or recirculating through the refrigeration circuit.
If the orifice tube is plugged, the high side pressure reading will be lower than normal, and the low side reading will also be lower than normal because no refrigerant is circulating through the system.
checkmark.gif If the refrigeration circuit seems to be functioning normally (compressor running, frost or condensation on the high pressure line from the condenser to the evaporator), but no cool air is blowing out of the ducts inside the car (and the blower is working), the fault is likely a BLEND AIR door that is stuck in the HEAT position, or possibly a badly clogged cabin air filter that is restricting airflow. Another possibility would be a fault in the automatic climate control system such as a ad interior temperature sensor or control module.

Sep 28, 2012 | 2007 Ford Ka 1.3

1 Answer

Location of low pressure port 1996 pontiac firebird


Hello,
The low pressure port for charging the A/C system is located on the larger aluminum tube coming from the A/C compressor. It is usually located in the tube line near the accumulator. That is an alumninum cylinder about the size of a soda can or slightly larger usually located close to the firewall along the left fender side well. It will have a plastic screw on cap on it, usually stamped with an "L" on top. Your recharge hose will only connect to the low pressure side, the high pressure port is a different size valve for safety reasons. You can only get an accurate pressure reading with the engine running and A/C running at max cold. blower on high speed, after about 5 minutes of A/C operation. Temperature outside will also have an effect on the pressure reading, optimum ambient air temperature of 70-80 degrees farenheit. Directions for recharge are on your R134a refill kit, but the system does require 20-30 PSI for the compressor to kick on. If your compressor is engaging while you are refilling, you can probably do it successfully. If your pressure is extremely low and compressor does not kick on, you most likely have a leak in the system which will have to be found and fixed before you can charge the system......Mike

Jun 24, 2011 | 1996 Pontiac Firebird

1 Answer

Where can I find the low port to recharge my AC on my 2000 chevy blazer


The low pressure port on an AC system is between the evaporator and the compressor. The evaporator is the cooling coil in the dash. I believe you will find an accumulator just on the "out" side of the evaporator. The accumulator is a round aluminum container about 4 in. in diameter and about 7 in tall. It has a tube from the evaporator going in near the top, a tube/hose going from the accum. to the compressor and probably a pressure switch and a charging port. All these items are located around the top of the accumulator. That charging port is the low pressure, (suction side of the compressor). Don't over charge. Use just enough to get cold air from the system. I doubt this system has a sight glass in the tube near the condensor, but if it does, put in just enough refrigerant to where you no longer see bubles going past the sight glass. If this is a cronic leak, you must have the leak repaired. It is aginst the law to recharge AC systems without repairing the leak.

Thanks for using FixYa. Good luck.

May 31, 2011 | 2000 Chevrolet Blazer

1 Answer

Do you recharge air conditioner on upper port or lower port


you always recharge on the suction side near the compressor. wear safty goggles!!!!This is the largest line and it will have a pin valve on the line for charging.Look for a sight glass ,it will be on the high pressure line near the dryer assy,a much smaller hose-line it will also have a pin type valve like a tire valve,the site glass is used to see if you are near full charge while recharging,buy observing bubbles.. if the unit is cooling the low side or line for charging will be cold,dripping with condensation on a hot day,and frosty on a cold day.if the system is low it will be warm and dry. but if it is low enough to be less than 50 psi the compressor will not opperate.

Sep 01, 2010 | 1994 Jeep Grand Cherokee

3 Answers

I have a 1994 chevy c1500 with a 305 motor. when i turn on the A/C the clutch engages/disengages continuously but no cold air. Any ideas?


Your A/C system may be running low on R134a.
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.
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.
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 freon 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.
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. Also be sure not to overlook the obvious, like a loose belt
Note: The line going from the compressor to the condenser is the discharge line – it is normal for it to be very hot to the touch. The other line going from the drier or accumulator to the compressor is normally colder. The liquid line can be hot up to the point an orifice tube is in place. Just remember that LOW Pressure = COLD and HIGH Pressure = HOT.
If you do want to recharge the system your self, make sure you do not over charge and use the thermometer at the vent and when it's cold enough, turn off the valve from the recharge line and disconnect from the low pressure service port. Good luck

Nov 04, 2009 | 1994 Chevrolet C1500

2 Answers

99 Toyota Tacoma a/c reads high pressure on low pressure side


Does the compressor run?
Low side could be high without a running compressor.

A running compressor?
The expansion valve itself is about $50 and bolts in.
You will have to remove the 134a gas before installing a replacement expansion valve and vacuum the system before recharging.

Sep 07, 2009 | 1999 Toyota Tacoma PreRunner

2 Answers

AC not cooling for 97 Passat TDI


A/c should be charged on the low side while engine is running. Make sure high side valve is turned off. Low side reading should be around 32-35 psi at idle high side should not go above 250. I hope this helps,good luck

Aug 01, 2009 | 1999 Volkswagen Passat

1 Answer

I have a 1997 Cadillac STS and the A/C doesn't blow cold very often.. The compressor will run for about 5 seconds bringing the low side pressure down from ~95 psi to ~40 psi then it shuts off for about a...


sounds more like the low pressure switch try that first u dont have to drain system for that,,,if it doesnt work they are two refridgerent temp sensors, u have to drain system first but u need to replace both so u know u have both coverd and dont have to go back in to system

Jun 28, 2009 | 1997 Cadillac Seville

2 Answers

AC has stopped blowing cold air. Compressor is working. Where is the recharge valve located?


There are two A/C refrigerant lines. The small line is your high pressure line and the larger line is your low pressure line.
Start at the fire wall and follow the "large " low pressure line to the compressor. The low pressure charge port will be some where on that line.
DO NOT try to recharge on the high pressure side ( small line )
Good luck, let me know.
Regards,

Apr 26, 2009 | 2001 Saturn L-Series

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