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2001 Chevy Blazer LT air conditioner not giving cold air, freon pressure is good I just filled it, Clutch is good I can hear it, Pipes are not sweating or cold? Could this be the air computer and if so where can I locate that. Thx Dennis

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Posted on Jan 02, 2017

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SOURCE: a/c warm low and high side pressures wrong

it could be one of 2 things.
you didn't vaccum it all the way or there is b clog in the system. next time u flush it run about 1/8 cup of rubbing alcohol through it . then push clean air through it. then refill it. if that doesnt work replace the seals on the compressorlow and high side lines/manifold.

Posted on Jan 05, 2009

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SOURCE: 88' s-10 blazer w/ 4.3 lt, oil pressure switch?

Look at back of engine on drivers side of distributor, screwed into block.

Posted on Jul 02, 2009

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SOURCE: 2000 chevy truck 5.3 liter. air conditioner works

After the clutch disengages ( when it's not suppose to )check the voltage on the + output terminal on the clutch relay, (inside the fuse box under the hood) if you have voltage there, check the voltage at the clutch, if you have voltage there too, its the clutch. The clutch gets worn and will engage when cool,but fails after heat builds up. Check this by tapping the face of the clutch with the ac on, if it's simply a worn clutch it will likely engage for a while.

Posted on Jun 14, 2010

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A/c clutch on 1994 chevy blazer won't engage

There is a low pressure switch on or near the drier that can be jumped, it is also a common problem with them.

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What causes my 2001 chevy tahoe to have ice on the air conditioner lines

It's actually normal for condensation to turn to ice on the a/c components at certain times. This is a good thing that the a/c is getting that cold. Some systems don't get that cold. It can become a problem if the evaporator gets clogged with ice, though, and air cannot circulate through the louvers.

Could be overcharged with freon or the high pressure or low pressure switch isn't working right.

Aug 17, 2010 | 2001 Chevrolet Tahoe

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Air conditioner not cold

Do you hear a clicking sound with a/c on, coming from under the hood, if so that's a sign that the a/c system is low on freon, some time when freon is to low the a/c compr won't come on at all, the system has a low pressure switch that won't let the compr come, so the compr won't get damage due to low on freon, have it service (recharge) and have them put some dye in there also, that way they will be able to check for leaks, freon don't wast, there has to be a leak some where's, that's the reason for the dye, if it's a very small leak, they might not be able to find it then, but when it happens again, with a UV light they will be able to look for the stain from the dye, and that's where the leak is at.

Jul 07, 2010 | 2006 Honda Odyssey

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96 chevy blazer not blowing out cold air only 70 deg.freon full clutch engage and disengages

Have you checked the low side and high side pressures? The compressor might be bad. Does one line to the compressor get cold and the line coming out get hot?

Jul 02, 2010 | 1996 Chevrolet Blazer

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2001 Volvo S80 2.9L air conditioner stops cooling after about 15 to 20 mins

This could be one of many problems so it's probably best checked by someone with the correct tools and knowledge.

That being said,

With your engine cold, open your hood and start your car. Check to see if your cooling fan is engaged, take note of its speed if it is. Then turn on your AC and listen for the compressor clutch to engage. once you hear it, check to see that your cooling fan is blowing, if it wasn't before. The fan should be on and in high speed whenever your AC is on, whether the engine is hot or not. If it is not, then the reason for losing cold air is that, due to the lack of being properly cooled, your freon pressure is getting too high and is causing the compressor to turn off.

If the fan is blowing as it should be, you may have a faulty compressor or the clutch on it may need to be shimmed.

Another culprit could be that your system is low on freon or the switch that senses the pressure is faulty.

And yet another culprit could be a faulty relay that is overheating and shorting out.

Sorry I couldn't give you a difinitive answer as to what the problem is, but without diagnosing it myself, this is the best I give you.

Good luck!!

Jun 15, 2010 | 2001 Volvo S80

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No cold air

Turn the a/c on to high blow fan, select full cold, open the hood with the engine running, the compressor has a clutch attached to the front of it and runs off the a/c fan belt, it will unmistakebly cycle if the system is working properly, you will see it cycle on and off and you will also hear it clicking on and off each time it cycles.
I suggest you start with those tests first and if you see the compressor is not cycling you are probably in need for a recharge of 134a freon which you can do yourself.
First look at the a/c lines and try to locate the sight glass incorporated into one of the thin(high pressure lines)small glass site that is a about 1/4-3/8 inch in diameter, its purpose is to let you know if the system is full charged or if it is partially chrged by means of allowing you to see air bubbles passing through the sight glass only if the compressor is cycling/working, the parts stores all carry the low pressure feed hose attachments and the proper freon to install to bring your vehuicle up to the cold desired from your a/c vents.
Each can of 134a is one pound, the system empty holds 2 3/4 pounds, buy one can of freon + oil Charge and install, one can of freon + leak detector and install and one can of freon + sealer.
If you are over filling the system through the (LOW) side only the system has a check valve that will blow off the excess and will probably scare the heck out of you as well. Please do all work with the engine running, a/c on fulkl cold high fan and eye and hand protection.
The leak detector may take a few hours to show traces of a slow leak, usually it is a colored die that is set into the freon can and must travel throughout the system to find its way to the leak, if the system has a fast leak it will spew out rather quickly, and hopefully if it is a slow leak the can with the leak stop in it may be enough to seal the leak, giving you enough time to save up for the actual repair needed to fix the leak.
Remember to always charge through the low side(wider hose and fitting) as the high side can cause serious harm to you as its high pressures can enter the freon can and cause it to explode.
A loose a/c fan belt causing the problem will be easy to detect as it will really be loose and probably noisey (squealing)when the compressor is on, if so adjust and or replace belt.

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1 Answer

Hi there... About 2 months ago my air conditioning was blowing hot air while air con was on cold Hyundai replaced the compressor after numerous phone calls & second opinions now my air compressor is...

I can tell you general principles about A/C but have not worked on a Hyundai. If the A/C lines under the hood and directly from the black cylinder tank are frosted or sweating, you have Freon circulating.

There are 2 cutoff switches in all systems. A low pressure and high pressure cutoff. The ideal amount of Freon is in the middle of these 2 pressure points.
In this way the compressor clutch will stay engaged the longest and keep the Freon circulating the longest. This is the way you get COLD air.

There are ways to measure the pressure and to find leaks. You can sometimes loan tools from Autozone or Oreillys for a deposit. Before blaming another electrical problem for the lack of COLD air you should test the pressure of the Freon left in the system. If you are within 90 days or 3000 miles, most minimum warranties cover the parts. With factory warranty it should go farther.

In answer to your electrical concern, yes there is another system controlling the A/C. The ductwork has either vacuum operated or electrically operated doors (flaps) under the dash. These "doors" blend the airflow by mixing cold and hot air to give you the temperature you want. If you want all COLD you keep the heater door shut and so on.

So you look at these areas separately first. Under the hood is the Freon pressure good? Pipes sweating? Compressor clutch on steady? And if everything under the hood is good, then you look inside the car at the ductwork.

I hope this helps you.

May 19, 2010 | Cars & Trucks

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What would make the AC clutch turn on an off repeatedly, approximately every 4 seconds on an 99 chevy Suburban 5.7L 4x4 LT? Only blows out hot air

low freon soumds to me.. jump out the low pressure cut out switch near the dryer...or jump clutch relay in the distribution center. with clutch ingauged hook up guages to check low and high side pressures... also easy trick go to auto store get a can of 134a freon with hose and add the can the clutch should stay inguaged longer and longer as you fill the sytem... with clutch inguaged rev motor up to 1500 the guage on the hose should be around 35 to 40 pounds if low add more

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That "thing" is part of the compressor clutch. When it’s spinning the clutch is engaged, when it stops the compressor is off. If it’s constantly cycling, you probably don’t have enough freon in the system. But remember, however the gas escaped before, it will escape again, unless you fix the leak.

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