Question about 1996 Chevrolet Astro

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96 astro van what steps should i take to repair A C air flow It only blows on defrost Where is the directional control

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Most likely the small vacuum hose under the hood broke just under the rudder air intake near the throttle cable bracket.

Posted on Jun 27, 2009

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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

2 Answers

What is the automatic control system 96 astro van


not understanding meaning of automatic control --the following link is the owners manual for your vehicle which explains the operation of your vehicle the link is for you in case yours is not available
1996 Chevrolet Astro Manuals

May 28, 2016 | 1996 Chevrolet Astro

1 Answer

Unable to get air flow to move from defrost, 97 astro van


vacuum leak. Make sure the vacuum line into the firewall is not disconnected or broken

Nov 14, 2010 | 1997 Chevrolet Astro

2 Answers

The air conditioning does not blow through front vents but through windshield vents, what is the problem?


This is a common problem on all Astro/Safari vans. The problem is a leak in the vaccum lines that control the vaccum switch responsible for changing air direction from the defrosters, dash vents, floor vents..etc.
Many of the problems that plaque the Astro/Sarfari vans and many other "Mini-Vans" is the build up of excess heat in the engine compartment. It\'s a tight place to put a V6-4.3 Vortec engine and the heat generated bounces back and cooks everything on the engine (coils, modules, sensors, wiring, and of course plastic vaccum hoses). No need to mess with your switches or anything behind the dash -- replace those thin plastic vaccum hoses to operate the vaccum switch (located just below the A/C canisters, to the right of the heater/ac blower housing) and your dash switches will magically send heated or cooled air where you want it.

Oct 25, 2010 | 2003 GMC Safari

1 Answer

2004 astro van when turning on the ac the air comes out defrost.


Look for vac hoses damaged or dislodged. System is designed to fail in defrost mode.

Jul 26, 2010 | 2004 Chevrolet Astro

1 Answer

No air flow from ip vents.


There is either a problem with vacuum to a actuator for the blend doors or a vacuum problem to the a/c programmer.It is also possible that the a/c programmer "control head" is bad.

Jun 12, 2010 | 1996 Buick Park Avenue

1 Answer

2000 chevy astro cargo van. the heat registers on the gage but little comes out and only out defrost. thermostat????


If it is blowing hot air out of the defroster and not out of the heater vents then the door that directs the heat from the defroster isn't working properly it is blocking the heat from going to the heater vents. Also check the cold air door. It sounds like it isn't closing all the way to shut off the cold air and not letting the hot air pass.

Oct 06, 2009 | 2000 Chevrolet Astro

2 Answers

Astro van 1997


There is a flap in your heater box that is controled by your vent switch by your heater controls. listen for a vacuum leak. that is common and hopfully the problem. there is vacuum lines that control the vent door that redirects the air to your vents.

Has your dash been messed with recently? if so i would check there first. you should hear a hissing if thats the problem.

Otherwise these also are common for that door flap to break and not switch NE more. thats the only 2 things that i can think of off th wtop of my head to be the problem. this would require the whole dash to come apart if its this problem

Michael
ASE certified

Feb 22, 2009 | 1999 Chevrolet Astro

1 Answer

Astro van 1997


The mode control switch is either defective or the switch has no vacuum, the motors that send the air to different outlets are powered by vacuum.

Oct 16, 2008 | 1997 Chevrolet Astro

2 Answers

2001 ASTRO VAN AIR CONDITIONING


i suspect the vents are controlled by vacuum and are not opening due to a vacuum leak.

Robert

Sep 01, 2008 | 2000 Chevrolet Astro

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