Question about 1998 Cadillac DeVille

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Blower working seems like vent is stuck in window defrost position so air not coming out of front vents

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

emissionwiz
  • 75005 Answers

SOURCE: AC cold air out of my defrost vents

u need to check the vacuum from the engine to the ac control head, the air defaults to the defrost when the system looses vacuum from the engine, this is for safety.

Posted on May 12, 2009

emissionwiz
  • 75005 Answers

SOURCE: Air won't come out of vents, but will from defrost and floor.

if it switches function even only a few then the problem is not the vacuum source (if u had no vacuum it would default to defrost mode) the problem is the dash control head vacuum mode control switch, i don't think u can just replace the switch, u have to buy the whole climate control module.

Posted on May 21, 2009

  • 9 Answers

SOURCE: air and heat not blowing air through vents

Either Your fan switch is burned out or you blower motor is no good, your blower motor is on the passenger side under the dash. Before you replace any parts you need to check your fuses and relays under your hood and in the car. Usually if your fan switch goes bad you will still get some air blowing thru the vents, so my guess would be blower motor, If its not a blown fuse or relay.

Posted on May 28, 2009

cadman000
  • 607 Answers

SOURCE: Air is blowing out of defroster and floor but not main dash vents

Check for vacuum hose leak.

Posted on Jun 17, 2009

theroadis
  • 81 Answers

SOURCE: Air vents not blowing

The air in your air handling system is usually directed by vacuum actuated servo's. That is, vacuum, produced, when your engine is running (when each piston goes down it creates vacuum) This vacuum can be Co-gen erated to be used in other parts of the vehicle. In this case, the air handling system. When, one moves the control arm or knob or button on the A/C control panel, this sends a vacuum or electrical signal to a given servo motor. This servo has a diaphragm that, when vacuum is introduced, it pulls the diaphragm "in" which in turn pulls or pushes a lever that operates a "door" inside your a/c plenum. This action directs air to the duct it was intended. Now, provided your particular car uses this system, I would check for any vacuum lines loose at the servo, or anywhere they connect.You might find a vacuum line loose under the hood. Listen for a hissing sound lke air escaping somewhere. You might find the problem.

theroad

Posted on Jul 11, 2009

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