What does it mean when the A/C is blowing warm and A/C button flashing?

2004 TOYOTA HIGHLANDER
150,000 MILES • 3.7L • 6 CYL • 4WD • AUTOMATIC
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VSSOUTLET
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Today my A/C started blowing warm and the A/C button was flashing. Then I pressed the button twice, the light turned solid and my A/C was fine.

What does this indicate? Do I just need to top off the refrigerant? If that is the case, what is the procedure?
Jul 1, 2021 at 5:47 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi,

That is the first thing I would check. If the pressure gets too low in the system, there is a "low pressure" switch that will prevent the A/C from working and damaging itself.

Take a look through this link. You may find it of interest. It discusses the most common causes of an A/C system not working or weak.

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

If you would like to try charging the system, here is a link that explains how it's done:

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

Let me know if that helps or if you have other questions.

Take care,

Joe

Jul 2, 2021 at 7:21 PM
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