Question about 1994 Cadillac DeVille

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Diagram of 1994 DeVille HVAC system

I would like to know how the vents move air in ac and heat.

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Posted on Jan 02, 2017

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Colin Stickland

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SOURCE: Air con/climate control

vacumn pipes on the trampillias(vacumn diaphrams )not working right

Posted on Nov 13, 2008

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Anonymous

  • 1 Answer

SOURCE: heater and ac vents

You have a vaccum leak on the mustang. Unsure of the Contour.. I believe it is the middle hose where the three fittings are (right in front of the driver seat in the engine compartment) Mustangs are notorious for vaccum leaks there

Posted on Dec 20, 2008

Anonymous

  • 4 Answers

SOURCE: 1999 cadillac deville air wont work

There's a blower motor (fan) under the hood and up against the firewall near the center of the car that takes some work to remove. It has gone out in the last 2 of my 4 Cadillacs. Turns out if you're not real careful with the positioning of the spark plug wires they will brush up against it, and if one of them gets cracked or brittle it will "arc" and short out the blower motor. The a/c compressor should still come on (you'll hear a click when it engages) but you won't get any air blowing into the cabin, hot or cold.

The part was like $200 stock (year 2000 prices) and it took about an hour to remove it. My Caddy at that time had this damn strut bar going across the engine bay which we eventually removed to get to the blower motor.

Posted on Apr 09, 2009

Anonymous

  • 85 Answers

SOURCE: 2000 Dodge RAM no HEAT/ New heater core / AC evap.

There is a actuator on the right side of your leg while sitting in the drivers seat under the dash. It has a plastic rod for actuation manually actuate this diverter and should be the problem.

Posted on Oct 14, 2009

Anonymous

  • 14 Answers

SOURCE: 1994 Cadillac deville, no heat. blower works,

may i ask do you have good antifreeze in it for the minus temp

Posted on Dec 08, 2009

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1 Answer

I have a 1999 Cadillac Deville. The ac will sometimes not blow, others work fine. Cold when going, think its a fan/blower thing, the ac always comes on, but cannot get the blower to always work


Blower motor control module , maybe. The HVAC control panel sends a PWM - pulse width modulation control .

HVAC Blower Motor Circuit http://www.bbbind.com/free-tsb free wiring diagrams . Enter vehicle info. year , make , model an engine . Under system click on HVAC ,then under subsystem click on HVAC controls . Click the search button , then the second blue link . Blower motor control diagram . Suggest you take it to a qualified repair shop if you don't know how to diagnose electrical systems on automobiles

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no the pipes should not be cold and wet but if you just have stop using the aircon recently it will do that for a while till all the gas is out of the system so yes its sorta normal

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sounds like a mouse nest in hvac system, no smell because when using ac it doesn't use outside air, probably a nest on the screen at the hvac air intake or if you have a a cabin air filter check in there. many times rodents make nests have babies and then the car moves and they cannot feed the babies and so they die and rot smell comes into car. usually it is not hard to access because there should be a screen between the outside and inside under the cowl cover, if no screen and the little buggers vot into your hvac duct system this could be a much bigger problem entailing removal of dash completely. most likely this isn't the case, good luck

Feb 11, 2014 | Chevrolet Impala Cars & Trucks

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Ac vents not working


There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,

Jun 13, 2012 | 2007 Ford Sport Trac Limited

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The heating and cooloing system is not working. There is no heat or air conditioning coming through the vents.


  1. Check the air conditioner fuse and replace as necessary.
  2. Air conditioner system discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
  3. Air conditioner low pressure switch defective. Replace switch.
  4. Air conditioner fan resistor pack defective. Replace resistor pack.
  5. Loose connection, broken wiring or defective air conditioner relay in air conditioning electrical circuit. Repair wiring or replace relay as necessary.

Dec 16, 2010 | 2005 Cadillac Deville

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Dash board air conditioning vents not working. Defrost and vents at feet are working on 2003 Chevy Silverado, 1500 series. What could be the problem.


dealership has to repalce control unit and clear the trouble codes, a free fix is unpluging your hvac fuses, and disconnecting your battery for 3 minutes, and then reconnecting your battery, and pluging in your hvac fuse, ensure the controls are off so that the hvac can go through all its cycles to regain the correct positon. sometimes the control doors move out of indexed range and the computer doesnt know what position they are in, so they default to defrost. if yours isnt too far out of range you can go back to enjoying normal ac and heat, if it is too far out of range you can still have ac and heat just through the defrost postion.

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BLOWER MOTOR WORKS BUT DEOS NOT INITIATE, AIR CONDITIONRE DOES NOT WORK


Try purchasing a new blower. There arent that expensive. If it comes on and off, the brushes inside the blower are bad, and you need to replace the blower. Or you may have some kind of constriction in your HVAC system which would cause you to hear the blower coming on, and no air being produced through your vents. Or another possibiilty could be that you have something under your dash constricting the blower from getting air to move through your vents, or maybe your filter needs to be changed. There is a filter on your blower. It may just be very filthy preventing any air from coming through. If you are trying to avoid buying a new blower I would suggest not running it again until you find the problem (more than likely one of the ones I listed) that could be causing you not getting any air to push through your vents. Hope this helps you.

Jul 09, 2009 | 1995 Cadillac DeVille

1 Answer

Air conditioner not working.


If your just talking about the fan, the fan is the blower motor. Behind your glove-box is a black plastic box that houses the evaporator(which the blower blows on to give you cold air, the heater-core ( which the blower blows on to give you heat). Your car has both components, the compressor is mounted in front of your car's engine and the fan, you know. Most likely you won't be able to handle repairing the a/c system. You can buy 1lb. cans to charge your a/c but repairing it requires special tools, gauges, temp. readings, containment systems,and so on. But if there is something specific that you want to attempt then ask and 'll try to help.

May 15, 2009 | 1994 Cadillac DeVille

1 Answer

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.

May 12, 2009 | 1994 Cadillac DeVille

1 Answer

Air will not blow out the vents


Sounds like the hvac doors are not moving when the dial is switched. These are usualy vaccum operated and the switch is under the dash behind the glove compartment. You probably need a service manual to know which lines run the door that controls where the air comes out, but you might only have a vaccum line pulled loose.

Mar 14, 2009 | Chrysler Town and Country Cars & Trucks

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