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Re: My 2000xk8 Jag air conditon is blowing hot air . I...
Most probably you have a leak some where.
What you can do is have it checked proffessionally , or if you like to do it your self :
Pressure fill the AC with AIR and you can use any air pump that will fit the lines.
After filling the air (up to 300, not more han that) you can get some water with soap , and put soap over the AC lines and seals and corners in the engine compartment. if any leak you will see soap bubles.
If nothing shows there then you have a problem with the cooling tank , radiator inside the dash and you need to check that.
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
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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.
HI you have a expansion valve at the rear evaperator that has gone bad and has to be replaced and a/c will need to be recharge.Hope this helps,if it does please rate my post.Thank You for using fixya,iluv2fish...Ray..
More likely the recharge blew a o-ring and you have a leak. When your Cavalier was blowing hot air and a recharge fixed it that means it was low on freon which lets o-rings dry out, go back to the shop and have them leak test it. They use a pressurized dye to find the problem. If it's blowing it's not the cooling fan relay, they may have meant compressor relay but I'd have a leak test done first it's not expensive and easier that chasing unknown possibilities.