Temperature Control Inoperative. Opel Sintra 1999

For 1990-2009 cars

## Temperature Control Inoperative No Airflow For Warm/Cold

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the entire HVAC system check performed? | -- | Go to Step 2 | Go to HVAC System Check

2

1. Place the ignition switch in the RUN position.
2. Using a DMM, probe between the heater-A/C control connector C2 terminal G and ground.
3. Move the temperature control knob from hot to cold, and cold to hot.

Does the measured voltage vary between approximately 1 and 12 volts?

1-12 V

Go to Step 3

Go to Step 4

3

1. Disconnect the electric slave actuator connector.
2. Using a DMM, probe between the electric slave actuator connector terminal 10 and ground.

Is the measured voltage within the specified values?

9-14 V

Go to Step 5

Go to Step 6

4

1. Check for a poor connection at the heater-A/C control connector C2 terminal G.
2. Check for a short to ground or voltage in CKT 733.
3. If OK, replace the heater-A/C control. Refer to Control Assembly Replacement .

Is the repair complete?

--

Go to Step 11

--

5 | Using a DMM, backprobe the electric slave actuator connector terminals 10 and 7. Is the measured voltage within the specified values? | 9-14 V | Go to Step 7 | Go to Step 8
6 | Repair the poor connection or open in CKT 241 between the electric slave actuator connector terminal 10 and S264. Is the repair complete? | -- | Go to Step 11 | --
7 | Using a DMM, backprobe the electric slave actuator connector terminal 8 and ground while moving the temperature control knob. Does the measured voltage vary between approximately 1 and 12 volts? | 1-12 V | Go to Step 9 | Go to Step 10
8 | Repair the poor connection or open in CKT 150 between the electric slave actuator connector terminal 7 and S213. Is the repair complete? | -- | Go to Step 11 | --

9

1. Check for a poor connection at the electric slave actuator or a binding air temperature valve.
2. If OK, replace the electric slave actuator. Refer to Temperature Actuator Replacement .

Is the repair complete?

--

Go to Step 11

--

10 | Repair the poor connection or open in CKT 733 between the electric slave actuator connector terminal 8 and the heater-A/C control connector C2 terminal G. Is the repair complete? | -- | Go to Step 11 | --

11

1. Turn the ignition switch to the OFF position.
2. Reconnect all connectors/components removed.

Have all the repairs been made?

--

Go to HVAC System Check

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## Temperature Control Inoperative Rear Only

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the entire HVAC system check performed? | -- | Go to Step 2 | Go to HVAC System Check

2

1. Turn the auxiliary blower switch to the REAR position.
2. Disconnect the auxiliary heater-A/C control connector C1.
3. Place the ignition switch in the RUN position.
4. Using a J 39200 , probe between the auxiliary heater-A/C control connector C1 terminal 4 and ground.
5. Move the temperature control knob from hot to cold, and then cold to hot.

Does the measured voltage vary between approximately 1 and 12 volts?

1-12 V

Go to Step 3

Go to Step 4

3 | Using a J 39200 , probe between the auxiliary heater-A/C control connector C1 terminal 1 and ground. Is the measured voltage within the specified values? | 9-14 V | Go to Step 5 | Go to Step 6
4 | Repair the poor connection or open in CKT 733 between S252 and the auxiliary heater-A/C control connector C1 terminal 4. Is the repair complete? | -- | Go to Step 15 | --
5 | Using a J 39200 , probe between the auxiliary heater-A/C control connector C1 terminal 6 and B+. Is the measured voltage within the specified values? | 9-14 V | Go to Step 8 | Go to Step 7
6 | Repair the poor connection or open in circuit 641 between the auxiliary heater-A/C control connector C1 terminal 1 and S345. Is the repair complete? | -- | Go to Step 15 | --
7 | Repair the open in CKT 850 between the auxiliary heater-A/C control connector C1 terminal 6 and S403. Is the repair complete? | -- | Go to Step 15 | --

8

1. Check for a poor connection at the auxiliary heater-A/C control connector C1 terminal 5.
2. Check for a short to ground or voltage in CKT 955.
3. If OK, replace the auxiliary heater-A/C control. Refer to Control Assembly Replacement - Auxiliary in Side Trim Panel or Control Assembly Replacement - Auxiliary in Overhead Console .

Was replacement of the auxiliary heater-A/C control necessary?

--

Go to Step 15

Go to Step 9

9 | Repair the poor connection or short to ground in CKT 955. Is the repair complete? | -- | Go to Step 10 | --
10 | Using a J 39200 , probe between the temperature valve actuator connector terminal 10 and ground. Is the measured voltage within the specified values? | 9-14 V | Go to Step 11 | Go to Step 12
11 | Using a J 39200 , probe the auxiliary temperature valve actuator connector terminal 7 and B+. Is the voltage within the specified values? | 9-14 V | Go to Step 13 | Go to Step 14
12 | Repair the poor connection or open in CKT 641 between the auxiliary temperature valve actuator connector terminal 10 and S345. Is the repair complete? | -- | Go to Step 15 | --
13 | Replace the auxiliary temperature valve actuator. Refer to Temperature Actuator Replacement - Auxiliary . Is the repair complete? | -- | Go to Step 15 | --
14 | Repair the open in CKT 850 between the auxiliary temperature valve actuator connector terminal 7 and S403. Is the repair complete? | -- | Go to Step 15 | --

15

1. Turn the ignition switch to the OFF position.
2. Reconnect all connectors/components removed.

Have all the repairs been made?

--

Go to HVAC System Check

--

## Temperature Control Inoperative Front Only

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the entire HVAC system check performed? | -- | Go to Step 2 | Go to HVAC System Check

2

1. Place the ignition switch in the RUN position.
2. Connect a test light from the electric slave actuator connector terminal 10 and ground.

Is the test light on?

--

Go to Step 3

Go to Step 4

3 | Backprobe with a test light between the electric slave actuator connector terminal 7 and B+. Is the test light on? | -- | Go to Step 5 | Go to Step 6
4 | Repair the poor connection or open in CKT 241 between the electric slave actuator connector terminal 10 and S264. Is the repair complete? | -- | Go to Step 11 | --

5

1. Turn the ignition switch to the OFF position.
2. Disconnect the electric slave actuator connector.
3. Disconnect the auxiliary heater-A/C control connector C1.
4. Disconnect the heater-A/C control connector C2.
5. Using a J 39200 DMM, check for continuity in CKT 733 between the heater-A/C control connector C2 terminal G and the electric slave actuator connector terminal 8.

Is the resistance within the specified values?

0 - 2 ohms

Go to Step 7

Go to Step 8

6 | Repair the poor connection or open in CKT 150 between the electric slave actuator connector terminal 7 and S213. Is the repair complete? | -- | Go to Step 11 | --
7 | Using a J 39200 DMM, check for continuity in CKT 733 between the heater-A/C control connector C2 terminal G and ground. Is CKT 733 shorted to ground? | -- | Go to Step 9 | Go to Step 10
8 | Repair the poor connection or open in CKT 733 between the electric slave actuator connector terminal 8 and the heater-A/C control connector C2 terminal G. Is the repair complete? | -- | Go to Step 11 | --
9 | Repair the short to ground in CKT 733. Is the repair complete? | -- | Go to Step 11 | --
10 | Replace the electric slave actuator. Refer to Temperature Actuator Replacement . Is the repair complete? | -- | Go to Step 11 | --

11

1. Turn the ignition switch to the OFF position.
2. Reconnect all connectors/components disconnected.

Have all repairs been made?

--

Go to HVAC System Check

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## Temperature Control Inoperative Front And Rear

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the entire HVAC system check performed? | -- | Go to Step 2 | Go to HVAC System Check
2 | Were you sent here for a poor cooling concern of the passenger compartment? | -- | Go to Step 3 | Go to Step 4
3 | Does the A/C compressor clutch engage when the A/C button is depressed? | -- | Go to Step 5 | Go to HVAC Compressor Clutch Does Not Engage

4

Before proceeding with the following table, check and make sure that:

• | the engine is reaching normal operating temperature.

• | both upper and lower radiator hoses have become hot.

• | both inlet and outlet heater hoses have become hot.

• | the cooling system is operating normally.

Is the cooling system operating normally?

--

Go to Step 5

Go to Heating Insufficient

5

1. Disconnect the heater-A/C control connector C2.
2. Turn the ignition switch to the RUN position.
3. Connect a test light from the heater-A/C control connector C2 terminal E and ground.

Is the test light on?

--

Go to Step 6

Go to Step 7

6 | Backprobe with a test light between the heater-A/C control connector C2 terminal C and ground. Is the test light on? | -- | Go to Step 8 | Go to Step 9
7 | Repair a poor connection or open in CKT 640 between the heater-A/C control connector C2 terminal E and S202. Is the repair complete? | -- | Go to Step 16 | --
8 | Backprobe with a test light between the heater-A/C control connector C2 terminal K and B+. Is the test light on? | -- | Go to Step 10 | Go to Step 11
9 | Repair the poor connection or open in CKT 241 between the heater-A/C control connector C2 terminal C and S264. Is the repair complete? | -- | Go to Step 16 | --

10

1. Turn the ignition switch to the OFF position.
2. Disconnect the electric slave actuator connector.
3. Disconnect the auxiliary heater-A/C control connector C1.
4. Using a DMM, check for continuity in CKT 733 between the heater-A/C control connector C2 terminal G and the electric slave actuator terminal 8.
5. Using a DMM, check for continuity in CKT 733 between the heater-A/C control connector C2 terminal G and the auxiliary heater-A/C control connector C1 terminal 4.

Is there continuity for both tests?

--

Go to Step 12

Go to Step 13

11 | Repair the poor connection or open in CKT 150 between the heater-A/C control connector C2 terminal K and S213. Is the repair complete? | -- | Go to Step 16 | --
12 | Using a DMM, check for continuity in CKT 733 between the heater-A/C control connector C2 terminal G and ground. Is circuit 733 shorted to ground? | -- | Go to Step 14 | Go to Step 15
13 | Repair the poor connection or open in CKT 733. Is the repair complete? | -- | Go to Step 16 | --
14 | Repair the short to ground in CKT 733. Is the repair complete? | -- | Go to Step 16 | --
15 | Replace the heater-A/C control. Refer to Control Assembly Replacement . Is the repair complete? | -- | Go to Step 16 | --

16

1. Turn the ignition switch to the OFF position.
2. Reconnect all connectors/components disconnected.

Have all repairs been made?

--

Go to HVAC System Check

--