Question about 1999 Chevrolet Blazer

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A/c warm low and high side pressures wrong

1999 chevy blazer with a 4.3l v6 i replaced evaperator vaccumed sysrem when i add freon compressor clutch engaes low side pressure 65 - high side pressure 75 system seems to only take a small amount of freon not a full charge

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  • Anonymous Mar 14, 2014

    high side pressure low on ac system

  • Anonymous Mar 27, 2014

    vaccumed a/c system hooked gauges up put r135a back in low side 15psi high side starts out good but line gets really hot after a bit 350+ psi the more Freon put in the higher the psi goes on high side

  • Anonymous Mar 30, 2014

    Freon was over full, fuse and relay check good compressor cycled for about 2 seconds once. Where are the low pressure cut in switch located

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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

  • woodystowing&garage
    woodystowing&garage Dec 01, 2013

    were is the vaccum at on my bazer

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1989 s 10 blazer won't take freon has 55 psi on low side while filling with comp. On only 20 psi high side where should I look for prob.


Sounds like the fittings are reversed.
With the compressor running, the low side should drop below zero then climb to 60 or 80 psi as you add freon.
You would need to jumper the low pressure switch to engage the compressor clutch to add freon. The compressor must be running.

Mar 22, 2015 | Cars & Trucks

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My 1999 chevy venture just had a compressor replaced and ac charged. It was working for 3 weeks, and now is blowing warm air??


it may be a slow leak in the system or it may have ait in the lines go under the hood there will be two valves a high and a low side test both and see if you have any freon if so it may be air in the line or even a bad comprssor clutch but not likely

Aug 25, 2011 | 1999 Chevrolet Venture

3 Answers

A/c on 97 chevy blazer v6 will not stay on unless I hot wire it and then it still blows hot air. what might be the next thing i check or do to find the problem?


It is probably low on freon. The low pressure switch will turn it off to protect the compressor because it needs the freon to circulate the oil. Hot-wiring it defeats the purpose of the low pressure switch and runs the compressor without oil. If you have not already destroyed your compressor by hot-wiring it, you can probably get it working better by charging the system.

Jun 01, 2011 | 1997 Chevrolet Blazer

1 Answer

A/C turned warm and got a loud clicking noise from under the engine. Small amount of initial visible smoke and smell. Noise goes away when A/C turned off. Is it the A/C clutch? Can that be replaced...


Hello, It can be the clutch but you need to test the residual pressure in the system as is. The clicking sound indicates the clutch is being switched off and on by the pressure switches. The smoke and smell can be the Freon escaping from a hole in the lines. Or the last gasp of the Freon created ice deposits which melted on the exhaust pipes and is now gone.

A quick explanation of the pressure switches and clicks. You have both a low and high pressure cutoff switch, the ideal pressure is theoretically in the middle of these 2 pressures and kepts the clutch running the longest. With too much Freon the pressure gets too high and the high pressure switch cuts off the clutch; with too little Freon the low pressure switch cuts off the clutch.

You need a tool to test pressure. The low pressure switch is on the freon line close to the black oblong cylinder. If you unplug the wire to this switch and make a U shaped coated jumper wire, you can make the clutch engage by inserting the wire into the connector while the engine is running. Do this for less than a minute if you are not prepared to add Freon, then remove the jumper.

You now know the problem is low pressure if the clutch turns on. Remember to have the dash controls set for the A/C. If the clutch did not engage, check your fuses, then blame your clutch.

Many of the autoparts stores have tool loaner programs. Check with the parts store for the A/C clutch and what tool is needed to change it. There is some room under the hood of a Grand Marquis and it may be possible to replace the clutch without removing the compressor or lines.

If the problem is low pressure and not the clutch, you must find the leak. Get a can of Freon with leak detector, jump the low pressure switch and add the Freon to the oblong tank by the Firewall.
Then repair the problem identified and purge and recharge the system. The autoparts stores loan out the Vacuum dryers.

May 04, 2011 | 1997 Mercury Grand Marquis

1 Answer

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

2 Answers

My 99 s10 blazer has ac problems. i tried to fill the refrigerant and the psi bounces between 55 and 20, it starts at 20 the builds to 55, then the clutch kicks on and the psi drops back dowm to 20. this...


I'm assuming that's the high side pressure reading. It sounds like you don't have enough refrigerant in there still. Depending on outside temperature the high should be around 130-150 and the low side between 25 - 30 or so with the compressor clutch engaged. Once you connect the can to the low side you'll have to start the car and turn the a/c on to get more in there until the pressure readings are correct.

Jun 21, 2010 | 1999 Chevrolet Blazer

2 Answers

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.

Jun 05, 2010 | 1999 Chevrolet Blazer

1 Answer

Have a 1999 Chevy Silverado V6. A/C is running warm. Tried to add R134, but still no change. The A/C clutch is cycling every 5 to 6 seconds. Replaced the cycle switch did not change anything. Any...


do you have gauges hooked to vehicle to read a/c pressures?? it is cycling because low side is dropping too low. this is because we aer low in freon or there is a blockage. need to be able to read pressures as just adding freon if you have a blockage can cause compressor to blow the lines off it. a blockage would most likely come from the orifice to stopped up. but if this is plugged up then we need to find out where the debris came from to block it.

May 24, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

On my 2003 Chevy Silverado, the A/C compressor won't kick on. Just blows out warm/hot air.


The ac system may need freon added,if the system is low,or out of freon,it will not allow the ac compressor to come on.

Apr 11, 2010 | 2003 Chevrolet Silverado 2500HD

2 Answers

1999 Chevy Blazer A/C Question


kavalbe: Servicing the A/C is sometimes not as simple as adding some freon. Ideally, it requires both high and low side gauges to monitor pressures when charging a system. Additionally, many systems today don't us anywhere the amount of freon that the old sytems did consequently it is not uncommon to find cars coming into shops with the complaint of A/C systems not cooling and all we find wrong is that the customer had over charged the system.
Your vehicle depending on whether it has Automatic Air or not has two different capacity specifications.
Automatic A/C (2 lbs ) Manual (1 lb 1.14 oz )

Unless you have a means of measuring the amount going in, it is difficult to charge the manual system accurately.
In my shop, I always empty the system, pull it into a vacuum and then set my machine for the exact amount.
When the system is being emptied, I will record the amount which had been recovered to let the customer know if they have over charged or under charged the system.
The pressures will tell if there is a problem with the orifice tube or compressor or other problems.
This may be a situation where you may either need to invest in a set on manifold gauges to let me or someone here know how the system is reading, OR bring it into a shop and at least have them diagnose the problem to find out if it is something over your head.

May 02, 2009 | 1999 Chevrolet Blazer

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