GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 2001 🢒 Intrigue 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Air Delivery Improper

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Listen for an audible click or feel for the click when the vacuum control assembly operates. Repeat the test as necessary.

    2.

  2. Tests for voltage at the vacuum control assembly. The HVAC fuse supplies power to the vacuum control assembly.

    3.

  3. Verifies that the HVAC control module is providing ground to the vacuum control assembly.

    4.

  4. Tests if ground is constantly being applied to the vacuum control assembly.

Step

Action

Values

Yes

No

Schematic Reference: HVAC Schematics

DEFINITION: Air does not flow correctly from the air distribution outlets.

1

Did you perform the HVAC Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - HVAC Systems - Manual

2
  1. Turn ON the ignition, with the engine OFF.
  2. Place the blower motor switch in the OFF position.

Is the blower motor OFF?

--

Go to Step 3

Go to Blower Motor Always On

3

Place the blower motor switch in each speed position.

Does the blower motor operate in any of the speed positions?

--

Go to Step 4

Go to Blower Motor Inoperative

4

Does the blower motor operate in each speed position?

--

Go to Step 5

Go to Blower Motor Malfunction

5

Except for the blower motor speed, are all of the functions of the HVAC control module inoperative?

--

Go to Step 8

Go to Step 6

6
  1. Start the engine.
  2. Place the blower motor switch in the maximum speed position.
  3. Place the mode switch in the vent position.
  4. Place the outside air switch in the ON position.
  5. Place the recirculation switch in the ON position.

Does the recirculation door operate properly?

--

Go to Step 7

Go to Air Recirculation Malfunction

7

Place the mode switches in each mode position.

Does the air flow from the correct air distribution outlets in each mode position?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 10

8

Test the ignition 3 voltage circuit and the ground circuit or the HVAC Control module for an open of high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 21

Go to Step 9

9

Test the ground circuit of the HVAC Control module for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 21

Go to Step 17

10

  1. Place the blower motor switch in the minimum speed position.
  2. Place the outside air switch in the ON position.
  3. Operate the mode switches through each mode position.

Does a vacuum control assembly solenoid click ON or OFF with each change in mode selection?

--

Go to Vacuum Control System Diagnostic

Go to Step 11

11

  1. Turn OFF the ignition.
  2. Disconnect the vacuum control assembly.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the ignition 3 voltage circuit of the vacuum control assembly with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

--

Go to Step 12

Go to Step 18

12

  1. Measure the voltage between the ignition 3 voltage circuit of the vacuum control assembly and each mode valve solenoid control circuit of the vacuum control assembly.
  2. Place the mode switches in mode position during each measurement.

Does the measured voltage on each control circuit change between the specified values?

0-12 V

Go to Step 16

Go to Step 13

13

Does the measured voltage on any control circuit remain near the specified value while operating the mode switches through each mode position?

12 V

Go to Step 15

Go to Step 14

14

Test the applicable mode valve solenoid control circuit of the vacuum control assembly for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 21

Go to Step 17

15

Test the applicable mode valve solenoid control circuit of the vacuum control assembly for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 21

Go to Step 17

16

Inspect for poor connections at the vacuum control assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 21

Go to Step 19

17

Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 21

Go to Step 20

18

Repair the ignition 3 voltage circuit of the vacuum control assembly. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 21

--

19

Replace the vacuum control assembly. Refer to HVAC Control Vacuum Valve Replacement .

Did you complete the replacement?

--

Go to Step 21

--

20

Replace the HVAC control module. Refer to HVAC Control Module Replacement .

Did you complete the replacement?

--

Go to Step 21

--

21

Operate the system in order to verify the repair.

Did you repair the condition?

--

System OK

Go to Step 2