Question about 2006 Kia Sorento

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My a/c is not blowing cold air. The compressor does not kick on when I turn the a/c on. I have tried adding freon to it but it does not allow any freon to enter the system. I have checked all the fuses and they are all good. I have tried switching the relays to make sure that the relay wasn't bad. How can I fix this?

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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...

Posted on Jul 14, 2009

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My lincoln mark lt pickup won't blow cool air


My lincoln had the same issue, first it was the A/C compressor (original). I replaced it with another one (used) and worked for 1 month. Then back to hot air. "A/C experts" told me the compressor was out again. I took it to a Mexican auto shop, old building where the guy works alone and to my surprise...HE FOUND THE PROBLEM!! There was no freon leaks, the lines were freezing cold inside the motor, checked freon>>full. He then checked the filter. This filter is on the end of the line where it is crimped that allows the freon to flow thru. Im no mechanic so explaining what it is, forgive me. I can only show you...the line is silver ad in front of you by the radiator, and its the same tube that goes to where you plug it to add freon. There is a filter that was clogged up and prevented the freon from flowing. He removed all the freon, vacuumed out the system/line, and replaced the filter for less that $3.00. Added freon and his cost was $80.00. Thank God for honest people who work hard for a living. I buy the parts, he replaces and I continue to give him my business. Other expensive auto shops with fancy buildings/prices My Lincoln Mark LT now blows arctic cold air!!!

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1 Answer

We tried adding freon to our 98 Montero AC unit but when we attempt to it says the it is at full pressure and will not let us add any but it is only blowing hot air with the ac on, so we do not think it...


Hi, if you have full pressure (40-50 PSI on low pressure side with engine running A/C set to maximum and blowing) you have enough pressure, but there is air in the system which degrades the refrigerant leading to no cold air. To remedy this, you must completely discarge the system and refil with new R134a which has the compressor/system oil added to it.
To discharge the system, shut off motor, attach your filler hose to low pressure valve and allow system to drain. (squeeze handle if you have that type filler hose) Allow it to drain until no sound of escaping air is present. Be careful not to have the end of hose facing you or others, wear gloves and have some shop rags laid down, pointing nozzle toward rags, that stuff can damage paint and skin and may be cold when escaping. After system has completely drained, start the refil process with engine running, A/C on maximum, blower on full. After about 1/2 of the first can of R134a or 1 full can, your compressor should kick on. Continue refilling with 3-4 cans total (about 3 LBS total) until you have a reading of 45 or so PSI. After each can, allow refrigerent to cycle through the system about 3 minutes to obtain an accuret pressure reading. Pressure is relavent to outside temperature also, optimumly the ambient air temp. outside vehicle should be between 72 and 80 degrees F. for proper reading. That should get you blowing cold air again!
Please rate this answer! Thanks, Mike

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1 Answer

A/C will not blow cold. I tryed adding refridge


It will take it a while ,until the compressor starts staying engaged long enough to **** the freon in faster.

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2 Answers

If my air conditioner still blows air does it just


did you put some freon in it? Freon should be installed by a skill professional or at the least someone who knows what they are doing.

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1 Answer

My air condition want' blow out cold air i try


If your car is more than a few years old, it probably has a leak or a worn compressor. You can add too much freon for the system. It needs to be vacuumed down to a negative pressure before adding freon, and then checked for compressor function and leaks. You may need to take it in to a reputable shop.

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1 Answer

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sounds like not enough freon or orfas valve is clogged. but most likely it is low on freon

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Could be the expansion valve. That's what allows the temperature to actually drop in the system - the contents of the AC system are under pressure, and are at a certain temperature. When the freon goes through the expansion valve, the pressure drops suddenly and dramatically, which "flash chills" the freon, allowing the air to blow cold. If it fails, you may get lukewarm air from the AC despite everything else working. Also though, check to see whether the AC evaporator fan (underhood) is working - on some cars, if it doesn't turn on, the compressor won't be run enough to cool the air.

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