9

If the vents start putting out hot air when accelerating or driving up hills but are ice cold when idling, is that a sign of a failing blower pump or leak? I am dealing with a Ford Econoline E350.

Refrigerant is obviously not the problem because the air is cold when idling. The air usually stays cold in the front but the back half of the vehicle's vents are blowing out hot air.Any ideas?

NULL
  • 301
  • 4
  • 11

1 Answers1

3

The air conditioner on this vehicle uses a vacuum powered HVAC controls. A leak anywhere in the vacuum system can cause this symptom. One way to test for leaks is to apply low pressure air (10psi) into the system and listen for leaks. Leaks at the vacuum reservoir are common. So is the line to the air recirculation valve because it is close to the passengers right foot.

NULL
  • 301
  • 4
  • 11
Fred Wilson
  • 11,667
  • 3
  • 30
  • 49