Always blows hot air?

Tiny
SATURN5
  • MEMBER
  • 1998 FORD RANGER
  • 4 CYL
  • 2WD
  • MANUAL
  • 116,000 MILES
No matter how I set the temperature control switch when I select the AC with the function control switch, the air is always hot. The AC blows through the defrost vents when I accelerate.
Saturday, January 30th, 2010 AT 8:37 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
First, it sounds like you have a vacuum leak. The vent doors are actuated by vacuum. When you accelerate, vacuum in the engine drops. If there is a leak, the air's direction usually changes. Check under the dash for vacuum leaks and under the hood.

Check out this guide

https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position

Now for the AC that blows heat. There is what is called a blend door. It is located near the heater core. In one position, it allows the air from the blower motor to go past the heater core. The other position allows air to produce cold air. If that door is stuck, you will always get heat. Make sure it is working and not stuck. Additionally, this could also be related to a vacuum leak.

Let me know what you find or if you have other questions.

Joe
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Tuesday, February 2nd, 2010 AT 4:13 PM

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