For the last few months I am having A/C problem on my Suburban, I thought it need freon got ir recharged it worked for few days and then it quit. I took to a A/C certified mechanic and they thought it was leak but could not find a leak, they recharged it and told me to run it and now it is doing it again. Sometimes it works great blows cold air and today it quit even thought it was working this morning. It also blows cold air from the vents when it works even though the A/C is off and now it blowing hot air when everything is off...Need Help ..Thanks
Unfortunately, the A/C systems on the GMT400 (92-99) GM SUV's were not particularly reliable. A fuse may have blown (unlikely), compresser may be bad, the condensor could be out, or the entire system may need replacement.
My advice? Take it to a different mechanic, or a dealer.
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If you're talking about a/c,it can't even be done unless it's by a shop.If your complete a/c has been updated within the last 15 years then it can be done.Pre-1995 used R-12 freon.1995 and after use R-134a freon.The R-12 requires a special permit just to buy,sell,use,or dispose of.The systems are non-compatible.The R-134a may fit the old filler,but it will not provide any cooling whatsoever.Sorry man.Greg
If the compressor will run turn it on and let it run for a few minutes, the line that gets cold is the low pressure side, this is usually the one closest to the firewall. The reason that they are 6 inches apart is that they are on opposite sides of the orfice tube, hence one is high pressure and one is low.
there is a line from under the hood freon manifold that runs under the vehicle to the rear evaporator and being under the vehicle it gets corroded and the freon escapes,you need to find the bad spot and go to an auto parts dealer and buy a "line-section" repair kit,then replace,then take it to a certified tech to evacuate the system and recharge it
The valve will be under your hood, on a line that runs from your AC pump, and it will have a blue cap on it. It's about three times as big as a tire valve cap. It sounds like you should let someone else do it.
Its a leak ...probably concealed like in an evap housing or rear air unit and lines (if it has that). Prob at this juncture I would remove all the freon and bring system into a vaccuum with a pump and see if it will hold vaccum for an extended period of time. A bad leak will not hold srong vacuum very long and much cheaper than wasting expensive and enviromental un0friendly refrigerants.
It sounds simple enough that you need to recharge your A/C unit. They can stop functioning properly after winter's end especially if they were not used. You should be able to get a recharge kit from your local auto parts store. Your Suburban should use the newer R142a refrigerant.
I ran into this problem with my 95GMC about two months ago. It was intermitten and then hard failed. I changed out the switch that is operated by the brake pedal with operates your brake lights and allows you to shift into gear. $9 later the problem was solved