Air Conditioning Question

Tiny
FFX620
  • MEMBER
  • 2007 HYUNDAI SANTA FE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 30,000 MILES
My air conditioner only blows hot air. I have checked the coolant level and added some to the full mark but it is still blowing hot air?
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Monday, April 12th, 2010 AT 10:03 AM

13 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
The AC doesn't cool from the engine coolant. Have you tried having the system recharged with freon?
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Saturday, May 22nd, 2010 AT 11:16 PM
Tiny
EBARTON
  • MEMBER
Cooling in my AC 2007 Santa Fe does not start up well. I need to have all the windows open and be driving over 35 for it to start. Had this problem less than two years ago and the dealer replaced a starter switch on the AC unit. Why is it happening again so soon? Is there something else wrong with the cooling system? Mileage 36,000 currently.
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Monday, March 19th, 2012 AT 3:14 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
It sounds like it may be low on freon, especially if it starts cooling when at speed

Read these guides, they will help

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon
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Monday, May 6th, 2019 AT 6:57 PM
Tiny
JOELEAN
  • MEMBER
  • 2003 HYUNDAI SANTA FE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
My lights are not changing when I turn on the Ac to the cold air. It only blows out fan air not cold. The lights are showing that it is on cold air not the fan which is running.
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Monday, May 6th, 2019 AT 6:59 PM (Merged)
Tiny
DAVE H
  • EXPERT
Hello,

It sounds like the control unit for the air conditioner is not working. Here is a diagram to help you change the unit out.

Check out the diagrams (Below). Please let us know what happens.

Cheers
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Monday, May 6th, 2019 AT 6:59 PM (Merged)
Tiny
PDT1973
  • MEMBER
Thank you so much I was the module in my car I just wanted others to know. It cost me $150.00 for a used one I installed it myself. :)
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Monday, May 6th, 2019 AT 6:59 PM (Merged)
Tiny
ALEDOBEARCATMOM
  • MEMBER
  • 2002 HYUNDAI SANTA FE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
When I am driving my air conditioning blows cold. When I am sitting idle for a while the air starts blowing warm air. I am thinking it is maybe the fan? How much would something like that cost to repair?

Thank yo!
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Monday, May 6th, 2019 AT 6:59 PM (Merged)
Tiny
RASMATAZ
  • EXPERT
An A/C system that blows cold air for awhile then warm air is probably freezing up. This can be caused by air and moisture in the system that allows ice to form and block the orifice tube.

Evacuating the system with a vacuum pump will purge it of unwanted air and moisture. Evacuation should be done with a vacuum pump that is capable of achieving and holding a high vacuum (29 inches) for at least 30 to 45 minutes.

For best performance, an A/C system should contain less than 2% air by weight. For every 1% increase in the amount of air that displaces refrigerant in the system, there will be a corresponding drop of about one degree in cooling performance. More than 6% air can cause a very noticeable drop in cooling performance, and possibly cause evaporator freeze-up.

Air can get inside a system through leaks, by not evacuating the system prior to recharging it, and/or by recharging the system with refrigerant that is contaminated with air. Recovery equipment can suck air into the recycling tank if an A/C system contains air or if the system has a leak. For this reason, the refrigerant recovery tank on recycling equipment must be checked and purged daily. On some equipment, this is done automatically. But on equipment that lacks an automatic purge cycle, tank pressure and temperature has to be measured and compared to a static pressure reference chart.

Some refrigerant identifier equipment can detect air in the system as well as other contaminants. An identifier should be used to check the refrigerant before the system is serviced to prevent cross-contamination of recovery and recycling equipment.

Possible causes of intermittent cooling in a manual A/C system that might be caused by an electrical problem include:

Faulty low pressure cutout switch. This switch prevents the compressor from running if the refrigerant level is low. If the cutout switch is not reading correctly, it can prevent the compressor from coming on.

Faulty compressor clutch. The magnetic clutch on the compressor requires full battery voltage to engage. If the voltage to the clutch is low, or the clutch coils have too much resistance, or the air gap in the clutch is too great, the clutch may not engage to drive the compressor.

Faulty compressor clutch relay. Check to see if the relay is receiving voltage when the A/C is turned on. Also check the relay wiring and ground connections. If bypassing the relay with a jumper wire or routing battery voltage directly to the compressor clutch makes the A/C work, the relay is probably bad.

Faulty A/C control switch. The switch may be worn and not making good contact when it is turned on.

Some possible causes of intermittent cooling (or no cooling) on automatic A/C systems include all of the above, plus:

A problem in the control module or control head (this usually requires using a dealer scan tool to read fault codes and perform self-diagnostics).

A bad temperature sensor (an ambient air temperature sensor, interior air temperature sensor, evaporator temperature sensor, or sunload sensor). Again, a factory scan tool is usually required to perform diagnostics on the system.
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Monday, May 6th, 2019 AT 6:59 PM (Merged)
Tiny
SIGN OF THE TIMES
  • MEMBER
  • 2002 HYUNDAI SANTA FE
Air Conditioning problem
2002 Hyundai Santa Fe 95000 miles

Which port do I use to re-charge the AC- there are two ports available? Thanks!
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Monday, May 6th, 2019 AT 6:59 PM (Merged)
Tiny
DOCFIXIT
  • EXPERT
Low side port should have a blue cap. If your using an auto parts store recharge kit it will only fit the low side.
Good luck
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Monday, May 6th, 2019 AT 6:59 PM (Merged)
Tiny
SIGN OF THE TIMES
  • MEMBER
Thanks- I've had a problem with the AC for three years, and got the run around each time- now they tell me it's not covered anymore!
Dealer replaced the O ring first time, recharged the system second time (lasted two days) and now they refuse to fix it-said it's probably the compressor, etc.
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Monday, May 6th, 2019 AT 6:59 PM (Merged)
Tiny
DOCFIXIT
  • EXPERT
Should be a number to call in owners manual if they have tried and failed you may have a case. Also request a meeting with the area dealer rep.
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Monday, May 6th, 2019 AT 6:59 PM (Merged)
Tiny
SIGN OF THE TIMES
  • MEMBER
Thanks for your help- link you gave me had the whole repair manual!
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Monday, May 6th, 2019 AT 6:59 PM (Merged)

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