Question about 1994 Chevrolet Camaro

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Air conditining not working properly, changed evspansion valve, drier, presure switch, showes30 lbs low presure, 200 high ,cools at first then quits, blows hot, drier gets hot and low side lines warm compresor never goes off even with out pressure .

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  • ebzeminor Jun 25, 2009

    this model has an expansion valve, not aware of oriface tube, also have black residue in system, trace amount.

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Check your orifice tube if its plugged up it will give you a high reading.

Posted on Jun 24, 2009

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1994 nissan pu 4x4 3.0 v6 air conditioning problem is cooling some. Low side 60 lbs of pressure: cooling on highway. At idle 60 lbs needle shakes somewhat. Was at one time cooling good this summer....


What is the high side reading? That's too high for low side maybe overcharged. Plugged expansion valve (no orifice tube) will cause low to neg psi low side.

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Can you please tell me where the AC high and low presure sensors are located on a 08 cts Caddilac


check for two switches into the top of the receiver/drier unit . They will have 2 wires to each one

May 12, 2014 | Cars & Trucks

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I have a 2006 mitsubishi lancer. The a/c works intermittently. Works the least the hotter the day gets. The presures are 25 low side & 145 high side @ idle. What are the proper pressures ? I beleive...


Those pressures are OK and within specs. I would suspect the cooling issue lies with the air temperature control blend door actuator and or the blend door sticking in the ducting due to warpage.

Jul 26, 2017 | 2003 Mitsubishi Lancer

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The a/c has a restriction & will not allow the Refrigerant to charge up. Can you tell me if this sounds like a metering device problem, or a drier blockage, or both?


this sound from expansion valve , befor refrigarator . this valve for balance presure between high/low presure lines . the drier should replace (more laod to compresor ) leve the vehicle for 20min and check persure high/ low mustnot big difrent

Jul 06, 2011 | 2000 Volkswagen Beetle

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My AC wont blow cold. As soon as I put freon in it, it blows cold for about an hour, then hot again. My friend told me that the orifice tube in his car needed to be replaced because it was convertine the...


Sounds like you might have a leak. If you charge the system and works for a time ,(hour, week, year) and then quits it sounds like perhaps the freon is leaking out somewhere. Freon does not ever get converted to air. Freon is in several states of existance while it is in your system. It is a high presure liquid, high presure gas, low presure liquid, and a low presure gas, but it is still always freon.
The valve your friend is talking about is called an expansion valve. What it does is to take the high presure "liquid" freon and allows it to pass into a low presure zone called an evaporator at a regulated rate. When you take freon at a liquid state high presure condition and expose it to a low presure environment it "evaporates" ( thus the name evaporator) and it gets very cold when it does this. This is where the cold air you feel coming out of the vents is made.
But the freon is in an enclosed system. By this, I mean it is never exposed to air, moisure (water), or anything else. I goes through all of these changes while inside this enclosed system.
Therefore, if the enclosed system is good then the amount of freon inside it will not change. If the amount of freon doesn't change then adding more will only make things worse.
I would suggest having the system checked with a hologen leak detector and/or system dye to find the leaks. Remember, if you have to add freon, then the freon that was there before must have escaped from somewhere.
Find a reputable shop to check the system for leaks. If it is leaking bad enough to run low in a hour it should be an easy to find leak.

Apr 13, 2011 | Chevrolet Cobalt Cars & Trucks

1 Answer

My air condition is not blowing cold air


best diagnostic method is dual head gauges. balanced pressure between low and high side in the off position is aroung 90 lbs. running low pressure is 20-40 lbs and high pressure 160-200, is the compressior not coming on? does it stay on, or click on and off. either might mean the freon level is low. try unplugging the low pressure switch on the low side supply line and shorting the pigtail wires together with a paper clip. does the compressor stay on now? if so and the air is warm or cool, freon is low. if the air is cold that switch is bad. if compressor still won't come on the list of possibilities grows longer: compressor, comp fan clutch, AC relay, restriction at several places... repair shop time...

Sep 04, 2010 | 1991 Buick Riviera

1 Answer

Hey I am haveing a problem with My 2500HD ac system. I have changed The Condensor, evaporator, and the Compressor. I have charged it to the correct levels. It blows cool air, but it doesn't get cold....


Did you change the Receiver/ Drier and the Orfice Tube/ Expansion Valve? The Receiver/ Drier takes moisture out of the system and the Orfice Tube/ Expansion Valve controls the Hot/ Cold air. If that is bad it may not be opening or closing fully which would not let your A/C get as cool as it supposed to.

Jun 25, 2010 | 2005 GMC Sierra 2500HD 4WD

2 Answers

My air conditioner won't blow cold air. It just blows air.


Hello I'm a M.B. tech. 1st you need to know why the freon is low. Hopefully it just needs to be serviced. There is a component located in the lf of the engine compartment called a receiver drier. It soaks up the moisture in the freon so the gases can work the way they are supposed to. On this unit there should be 2 switches(I believe they were combined into one switch in 98. 1 switch is a temp switch that operates your electric fans, the other is a compressor cutoff switch. Assuming the compressor is not coming on-take a fused wire and bridge the 2 contacts- If the compressor does not come on at all there is another problem(it is not low on freon. On the condenser there is a high side port(it is the bigger of the 2)By the brake master Cyl.(lf of the engine compartment thereshould be a smaller low side valve in line with the fuel cooler hose. Usually you can hook up a machine to the low port and **** freon in through that port. Assuming you do not have a refrigerant machine. It is very self explanatory on the bottle of r 134a refrigerant which can be purchased at your local auto supply store. I would start with 1 lbs. and add dye with the freon in case there is a big leak. If the system is overcharged it will not cool properly. I believe the system capacity is approx. 2 lbs. Add a few ounces after the first pound until a/c system is cooling properly and the electric fans are also coming on when the system gets to high. If you get a can with a good Gage set on it you should see the high side between 150 and 2000 psi(fan coming on at max. press.) also the low side should read about 35. It is about the temp of the evaporator which is i=located in the dash and the blower blows through this component out through the vents. Hopefully I have been helpful.

May 28, 2009 | 1997 Mercedes-Benz C-Class

1 Answer

Air conditioner doesn't work


problems yes low high and high low are usually caused by faulty defective clutch coil or defective thermostat...electrical issues can be cycling switch pressure switches ambient air sensor or fin switch ( evap temp sensor)
Mechanically it could be clutch,or compressor the symptoms are not good... srry hit me back if you got some manual gauges and wanna run pressure test diagnostics..

May 08, 2009 | 1997 Infiniti.5 J30

1 Answer

A/c problem


Why did you change compressor? If for failure, or even just changed because not cold, did you flush out entire system? Compressor failure can lead to a clog in the high pressure line. The low pressure line will usually become very cold-may even ice up- but the receiver/dryer will not be very cold to touch. Monitor your head pressure and make sure your pulling less than 25 lbs. on low side 75 F ambient. High side should not exceed 300 lbs.
Charge weights should also be exact as overcharge has same results as undercharge-hot air. If all is good under hood and head pressures o.k., look for debris build up on evaporator core in air box under dash, clean as required. Also make sure blend door is closing properly and heat is not staying on.

Hope this helps.

Jun 12, 2008 | 2001 Ford Windstar

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