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Air conditioner is blowing cold then it gets humid

Tiny
NICI&RICKY
  • MEMBER
  • 2009 KIA SPECTRA
  • 1.8L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 173,000 MILES
The air conditioner started blowing humid air at a stop and then the car started overheating. The cooling system was replaced about 1,000 miles ago not sure why it would do that. Also after I noticed the car was overheating I turned of the air conditioner and put the heater on, the temperature leveled off while the heater was on and slowly driving around in the parking lot.
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Wednesday, July 27th, 2016 AT 7:48 PM

4 Replies

Tiny
FREEMBA
  • MECHANIC
  • 1,152 POSTS
Turn on the air conditioner and open the hood to see if the cooling fans are running. If they are not, this will result in the air conditioner not cooling and the engine overheating. Let me know the results. Thanks.
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Wednesday, July 27th, 2016 AT 7:58 PM
Tiny
NICI&RICKY
  • MEMBER
  • 2 POSTS
The fans are working and I let the car sit for twenty four hours, I checked the coolant and it was surprisingly low, the cooling system was done maybe a little over a thousand miles ago. There are no leaks of coolant anywhere and the coolant looks fine. I checked the oil dipstick for coolant and it is clean. We can drive the car without it overheating but we have to top the coolant off everyday. I am lost here.

Thanks.
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Saturday, July 30th, 2016 AT 10:44 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Just to add this one the heavily overlooked cause of coolant loss and overheating. Is a bad radiator cap not holding the correct pressure. You will loose coolant and causes over heating. A lot of the time you won't even see the coolant leak. You can try replacing the radiator cap they are cheap. If that does not work it is best to do a coolant pressure test you could have a slow leak that you never see on the ground. Also there is coolant dye which you can use a dye light to find leaks.
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Sunday, July 31st, 2016 AT 3:46 PM
Tiny
FREEMBA
  • MECHANIC
  • 1,152 POSTS
Have a cooling system pressure test done. This "invisible" type leak is often the water pump. Many times it will only leak when the engine is at higher than idle rpm. So when driving it will leak, but idling there is no leak.
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Tuesday, August 9th, 2016 AT 4:23 PM

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