I recharged my a/c in my Jimmy a few months ago and it worked great. now it started blowing hot air and the pump is cycling. I put the gauge on it and it jumps fron good charge to over charge and blows hot air. Is something cloged? I can't aford to take it to a shop and would like to fix it myself if possible. were do I start?
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The first thing to do would be go to your local auto parts store and buy an air conditioning recharge kit. Provided your vehicle isn't too old, they sell recharge kits that require no tools.
If their is a leak anywhere while you recharge, you will know.
Try recharging the air conditioning first, it is very simple and the kits come with simple instructions.
If there are no leaks, your A\C will blow cold air again. As for the pressure, if it continues to slightly blow air you may be looking at a new air compressor unit or a vaccum line. A new unit will run you anywhere from $200-$2000 dollars plus labor depending on the vehicle.
If the recharge works, at least you will have slightly blowing cold air rather than hot and you can continue that way until the unit fails.
I have a 2007 kia rondo.Ac was working,parked it for a year,ac wasnt working,recharged,the ac,it worked for a month,an started again,blowing hot ai.If you let it set for hour would start working...then after a few days it would only work early morning,if you dont turn ac of,then it stop working,I see the clutch isnt kicking in,ir you try an put freeon in it soon as you start putting it in it would kick on.An its full of freeon.
When recharging the ac you need to recover the old refridgerent. That means you have to take out all the old 134 and replace with new 134. On the engine sticker under the hood should tell you how many pounds of 134 it takes. When put in the 134 make sure your ac is on high.
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.