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How do I repair a vacuum leak? The A/C is coming through the defroster vents

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Most likely it may be the thin black plastic vacuum line that comes from top of intake plenum (driver side) and runs forward over top of air intake tube (between air filter and throttle body). This line may have been pulled loose by others working on engine maintenance or have cracked from age. This was the problem on my 1999 Astro...and hopefully it will be a simple on yours. Spec what year/model you have...it could be different than mine.

Posted on Jan 13, 2010

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2 Answers

My ac air is


Without doing so testing it would be hard to say , would just be guessing . Where did you have it checked ? If it does change every once and a while , I would think it could be a sticking actuator or in the heater and A/C programmer module . The heater and A/C programmer will direct the blended air in one of several air delivery modes. The side window outlets receive the airflow during all of the modes of the operation. The heater and A/C programmer directs air to the other outlets by energizing specific vacuum valves. This feeds the appropriate combination of mode valve actuators.
1
  1. Turn the engine ON.
  2. Select HI BLOWER.
  3. Connect the Scan Tool .
  4. Use the Scan Tool in order to command recirculation door movement.
Does the recirculation door operate?
--
Go to Step 2
Go to Step 3

2
Using the
Scan Tool , select AIR DOWN.
Is most of the air flowing from the heater (floor) vents, with only a small bleed out of either the defrost vents or the A/C vents?
--
Go to Step 7
Go to Step 4

3

  1. Remove the programmer vacuum hose connector.
  2. Measure the vacuum on the orange hose.
Is the vacuum less than the specified value?
10 in Hg
Go to Step 14
Go to Step 13

4

Attach a hand held vacuum pump to the YEL CKT.
Does the vacuum pump hold vacuum?
--
Go to Step 5
Go to Step 6

5

  1. Inspect for a stuck up/down valve or actuator.
  2. Inspect for the proper hose routing. If the routing is OK, replace the heater and A/C programmer. Refer to .
Is the repair complete?
--
Go to Step 16
--

6

Repair the leaking hose or the actuator.
Is the repair complete?
--
Go to Step 16
--

7
Using the
Scan Tool , select A/C DEFROST.
Is most of the air flowing from the the A/C vents or the defrost vents, with only a small bleed from the heater vents?
--
YES Go to Step 8
NO Go to Step 9

8

Is most of the air out of the defroster vents?
--
YES Go to Step 10
NO Go to Step 11

9

Attach the hand held vacuum pump to the RED CKT.
Does the pump hold vacuum?
--
YES Go to Step 5
NO Go to Step 6

10
Using the
Scan Tool , select AIR UP.
Is most of the air flowing from the A/C vents with only a small bleed out of the defroster vents?
--
System OK
Go to Step 12

11

  1. Inspect for a stuck A/C-defrost valve (door) or actuator.
  2. Inspect for proper hose routing. If the hose routing is OK, replace the heater and A/C programmer. Refer to .
Is the repair complete?
--
Go to Step 16
--

12
  1. Repair the leaking hose or actuator.
  2. Inspect for a stuck A/C-defrost valve (door) or actuator.
  3. Inspect for proper hose routing.
Is the repair complete?
--
Go to Step 16
--

13

Attach the hand held vacuum pump to the ORN CKT.
Does the pump hold vacuum?
--
Go to Step 15
Go to Step 6

14

Repair the vacuum source.
Is the repair complete?
--
Go to Step 16
--

15

  1. Inspect for a stuck inlet valve (door) or actuator.
  2. Inspect for proper hose routing. If OK, replace the heater and A/C programmer. Refer to .
Is the repair complete?
--
Go to Step 16
--

16

  1. Clear the DTCs.
  2. Verify that the system is operating properly.
Did you clear the DTCs and verify the operation?
--
System OK

Good luck hope this helps ! Do you need directions on how to get the heater / A/C controller out .

Jun 17, 2016 | 1999 Cadillac DeVille

1 Answer

Air comming out the defroster vent not the face vent


It sounds like you may have a vacuum leak. If you have a vacuum leak it will cause the air to only come out of the defrost vent no matter what you have the controls set to. Hope this helps you out and gives you some place to start looking.

Aug 29, 2011 | GMC Jimmy Cars & Trucks

1 Answer

The AC air comes out defrost sometimes and comes


what position is the control switch in? does this occur when accelerating?

the door that directs air flow is controled by a vacuum motor. the default position for the door directs air flow to the defrost vents in the event of vacuum loss to ensure the windsheild will be clear of mist. if there is a small leak, vacuum will temporarily be removed when accellerating and the motor will revert to the default position. there are vacuum lines from the control knob to the motor you must check these lines for leaks. the diaphram in the motor may be bad. also check the main vacuum supply line to the control knob. usually red in color. if there is a vacuum storage cannister. it may be leaking. this cannister will maintain vacuum for the circuit when accellerating. engine vacuum decreases when accellerating.

May 31, 2010 | 2004 Ford F150

1 Answer

2000 mercury grand marquis HVAC air distribution problem. Air comes out defrost vents regardless of control settings.


there is a vacuum motor that controls direction for air flow. when there is a vacuum leak, the control door defaults to the defrost vent. the motor, vacuum lines and directional control knob must be inspected. most of the time i have found that there is a vacuum line broken. purchasing a repair manual will help locate and discribe the system.

May 24, 2010 | 2000 Mercury Grand Marquis

1 Answer

Air conditioning and heating problem


The blend door actuator is vacuum driven. It sounds like you have a vacuum leak. Trace the vacuum lines starting at the firewall in front of the passenger side. With the heater or AC on HIGH and directed at the front vents, listen for a leak or trace the vacuum line back ward to try to find a leak. All the best.
Greg

Jun 22, 2009 | 1999 Ford Ranger SuperCab

1 Answer

Air conditioing stops coming out vents and comes out defrost vent


It sounds like you have a vacuum problem. When the engine is running it generates a vacuum in the exhaust manifold. That vacuum is used to move the actuators inside your dash to the position you chose with your controls. If you have a vacuum leak or something interrupts the vacuum, the actuator will move to its default position which is the defrost vents. It sounds like the act of accelerating is somehow interrupting the vacuum. I'd look for little cracks in your vacuum lines and check your ERG valve.

Jun 17, 2009 | 1994 Oldsmobile Cutlass Ciera

1 Answer

AC AIR BLOWS BACK AND FORTH FROM DEFROST TO FRONT VENTS


you have a vacuum leak. Check the vacuum reservoir for a leak.

You can spray short bursts of starting fluid on the vacuum lines to find a leak. When engine revs, that's the leak. Be careful.

Vacuum Reservoir Tank and Bracket Removal
  1. NOTE: The A/C vacuum reservoir tank and bracket (19A566) is located either on or beneath the RH front fender splash shield (16102) .
    If the A/C vacuum reservoir tank and bracket is visible from above in the engine compartment, perform Steps 2 through 4. If the A/C vacuum reservoir tank and bracket is not visible in the engine compartment, perform Steps 5 through 8.
  1. Remove the screws and the A/C vacuum reservoir tank and bracket. 1b32ebf.gif

Jun 14, 2009 | 1988 Ford Ranger

1 Answer

Head lamps will not work


for the defroster only problem, check your vacuum lines. There are even lines under the dash. The switch the controls all that is run on a vacuum. It sounds like you have a head gasket leak. If the leak is big enough, you will lose vacuum pressure. The blower defaults to defrost vents when the vacuum is not strong enough. I had a leak in a vacuum line, causing the blower to switch to defrost, no matter what it was set to.

Dec 27, 2008 | 1992 Chrysler Lebaron

5 Answers

98 winstar.My van has quit blowing air out of the vents. Air only comes out the top where the defroster blows. What has happened? Reccomended repairs?


i have the same problem.cold air comes out the dash then cuts off to the floor then cuts off to the defrost.the rear vent only blow out hot air.please help me to

Aug 10, 2008 | 1998 Ford Windstar

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