GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect the affected valve actuator.

Is the valve actuator correctly installed and connected?

--

Go to Step 2

Go to Step 3

2

Disconnect the actuator from the valve. Inspect the valve.

Does the valve display proper travel and effort?

--

Go to Step  4

Go to Step 5

3

Repair the valve actuator.

Is the repair complete?

--

System OK

--

4

Inspect the electrical connector for the following conditions:

    • Improper connections
    • Loose terminals
    • Corroded terminals

Did you find a condition?

--

Go to Step 7

Go to Step 6

5

Repair the valve.

Is the repair complete?

--

System OK

--

6

Inspect the actuator for proper operation. Repair the actuator.

Is the repair complete?

--

System OK

--

7

Repair the electrical connector as necessary.

Is the repair complete?

--

System OK

--