Ac problem had compressor tested today and has full freon. ac fuse is good and so is the relay..It all started with the ac fuse blowing about three weeks ago. mechanic replaced fuse and it blew again. Replaced relay and over sized the fuse from 7.5 to a 10. worked fine and blew cold till today when compressor went out again. Checked fuse and this time it did not blow.had relay checked and it is still good. had compressor checked and it is full. Mechanic says it must be an electrical problem...what else electrical could it be...is there something i can look for on the compressor electrical line. Would I be looking for a broken or exposed wire... any suggestions. thank you.

SOURCE: 99 Kia Sportage, 2wd, automatic, 4 cylinder. The

a/c control unit/module seems to be defective!!!!! because its the one that switches on the compressor!

SOURCE: My a/c is not blowing cold air.

The compressor probably isn't kicking on beacuse it is low on freon. It won't take freon when you try because the compressor needs to be running to draw it in. Sounds like a catch 22 doesn't it? There is a low pressure switch either in the filter/drier, or on the low pressure line. If you unplug the switch and hook a jumper between the two pins, the compressor should kick on, allowing you to add freon. Hope this helps...

SOURCE: no cold air coming out, checked fuse all working,

That's exactly the problem. But the fault could very well be the electronic relay module that activates the clutch.

Before you go buying a clutch first check both the dash switch and the relay to ensure they're not the far less expensive problem.

Rich Norman

• 502 Answers
• Posted on Aug 24, 2009

SOURCE: 2003 Kia Sedona, A/C stopped blowing cold air without any warning

do a pressure test. You may have lost freon to the point where it will not let the compressor come on. If you do not have any gages or access to a gage, buy one of the cans of freon that has the low pressure gage attached. Make sure you get the one that has 134A with sealer. The pressure should be about 100psi not running and go down to about 60 when it is running. IF you have a slow leak and the system is low, the compressor will not come on. If you get very low or no pressure when you hook up the can, don't waste your money, have the system checked for the leak. You must vacuum the system down to 30 inches of vacuum before refilling if it is empty, and it does not good to fill it if it is just going to come back out.

Hope this helps
Rich

Testimonial: "Thank you for the quick response."

SOURCE: A/C is blowing hot air. Freon is full, compressor

Not sure how you know if the freon is full without the unit running. There are a number of switches which can keep your A/C from coming on. There is a low pressure switch which is usually located on the larger line and sometimes located on a silver cannister (called an accumulator) which is the low side of a compressor circuit. There is also a high pressure cutout which is usually located on the back of the compressor unit. Both of these switches can be jumpered out to see if they are the reason for the compressor not working. You remove the two wire connector to either switch and place a small jumper wire between the two wires on the connector block. The other reason my be a low idle cutout switch and this will also usually be located near on on the compressor. You can also test it the same way as the other switches. If it is the low pressure switch then of course you will need to add freon which you can purchase from any auto parts store. They usually come with instructions and all the equipment needed to add in freon. If it is high pressure, then some of the freon should be recovered from the system by a technician. If is the low idle cutout then you will have to take it to a mechanic to understand why it is idling so low. Hope this helps.