Question about 1999 Chevrolet Blazer
The air does not cool....already replaced clutch control switch, has plenty of refrigerant R134a, still no cool air, my husband and i disagree on whether the compressor comes on or not.....and when it was cooler outside heater gave no heat out....blower seems to work fine....OPEN for suggestions or info.....1999 Chevy Blazer s-10 size 4.3 ltr
Visually check to see if the compressor is coming on .The pully will free spin all the time.When the compressor engages you will her a click then the you will see the clutch start turning on the compressor. Normal operation would too see the clutch enagage for a few seconds then stop. The heat is separate from the a/c aside from the controls.The antifreeze level can affect the heat. A very common issue on the blazer is the heater core getting plugged with corrosion.Back flushing the heater core and verying the antifreeze level is good may resolve the heating issue.If it continues with no heat the thermostat may be bad.
Posted on Jun 05, 2010
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.
Posted on Jun 05, 2010
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Posted on Jan 02, 2017
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