AC unit

  • 1 POST
  • 5.6L
  • V8
  • 2WD
  • 141,000 MILES

Not getting at least a forty five degree air supply.

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have the same problem?
Tuesday, June 27th, 2017 AT 6:41 PM

1 Reply

  • 29,781 POSTS

Are you saying you are not getting 40 degree air from the vents when the AC system is running? If that is correct, who wants to sit in 40 degree air? Actually, you had better not ever get air that cold. The goal of the system is to lower the temperature of the incoming air by only 20 degrees. While that may not sound impressive, the real comfort comes from removing the very high humidity in the air. That moisture condenses on the cold evaporator in the dash, then drips into a drain pan and runs outside. That is why you see a water puddle just behind the right front tire when the vehicle stands in one spot for a few minutes.

All AC systems are regulated so the temperature of the evaporator never falls below around 40 degrees. If it got down to 32 degrees, that water would freeze into a block of ice and block air flow. Then only a little air might make it through, and no cooling would occur.

When the system is working properly, and the evaporator gets down to 40 degrees, you can't expect the air to be that cold if it starts out at 80 degrees. It is in contact with the fins on the evaporator for just a faction of a second, and even less if the fan is on the higher speeds. If you get 60 degree air from the vents, the system is working fine. Even that is too cold to be comfortable for very long.

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Wednesday, June 28th, 2017 AT 8:08 PM

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