GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1998 🢒 Intrigue 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Temperature Actuator Inoperative

Step

Action

Value(s)

Yes

No

1

Check the HVAC fuse.

Is the HVAC fuse open?

--

Go to Step 2

Go to Step 3

2

Repair short to ground in circuit 41(BRN).

Is the repair complete?

--

System OK

--

3
  1. Turn the ignition switch to the ON position.
  2. Use a Digital Multi Meter (DMM) to backprobe the heater-A/C control harness connector C 2 from terminal B 5 to ground.
  3. Move the temperature control knob from HOT to COLD, and COLD to HOT.

Does the measured voltage vary within the specified value?

1-12V

Go to Step 4

Go to Step 5

4
  1. Disconnect the LH electric actuator connector.
  2. Connect a DMM between the LH electric actuator harness connector terminal 10 and ground.

Is the measured voltage within the specified value?

9-14V

Go to Step 6

Go to Step 7

5
  1. Disconnect the heater-A/C control harness connector  C 2.
  2. Connect a DMM between the heater-A/C control harness connector C 2 terminal B 7 and ground.

Is the measured voltage within the specified value?

9-14V

Go to Step 16

Go to Step 12

6

Connect a DMM between the LH electric actuator harness connector terminal 10 and terminal 7.

Is the measured voltage within the specified value?

9-14V

Go to Step 8

Go to Step 9

7

Locate and repair a poor connection or an open in circuit 41 (BRN) between S 233 and the LH electric actuator harness connector terminal 10.

Is the repair complete?

--

System OK

--

8
  1. Connect a DMM between the LH electric actuator harness connector terminal 8 and ground.
  2. Keep the heater-A/C control connector connected.
  3. Move the temperature control knob from HOT to COLD and COLD to HOT.

Does the measured voltage vary within the specified value?

1-12V

Go to Step 10

Go to Step 11

9

Locate and repair a poor connection or an open in circuit  1450 (BLK) between the LH electric actuator harness connector terminal 7 and S 230.

Is the repair complete?

--

System OK

--

10
  1. Check for poor connection at the LH electric actuator.
  2. Check for a binding air temperature valve.
  3. If OK, then replace the LH electric actuator.

Is the repair complete?

--

System OK

--

11

Locate and repair a poor connection or an open in circuit 1199 (DK BLU) between the heater-A/C control harness connector C 2 terminal B 5 and the LH electric actuator harness connector terminal 8.

Is the repair complete?

--

System OK

--

12

Locate and repair a poor connection or an open in circuit 41 (BRN) between the heater-A/C control harness connector C 2 terminal B 7 and the fuse block terminal B 4.

Is the repair complete?

--

System OK

--

13
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the heater-A/C control connector.
  3. Use a DMM to measure the resistance between the heater-A/C control harness connector C 2 terminal B 5 and ground.

Is the measured resistance within the specified range?

∞

Go to Step 15

Go to Step 14

14

Locate and repair a short to ground in circuit 1199 (DK BLU).

Is the repair complete?

--

System OK

--

15

Replace the heater-A/C control. Refer to Control Assembly Replacement .

Is the repair complete?

--

System Ok

--

16

Connect a DMM between the heater-A/C control harness connector C 2 terminals B 7 and B 8.

Is the measured voltage within the specified range?

9-14V

Go to Step 13

Go to Step 17

17

Locate and repair a poor connection or an open in circuit 1450 (BLK) between the heater-A/C control harness connector C 2 terminal B 8 and G 200.

Is the repair complete?

--

System OK

--