GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect for a mechanical binding in the Radiator Shutters.

Are the shutters binding?

--

Go to Step 4

Go to Step 2

2

  1. Disconnect the Radiator Shutter Engine Coolant Temperature Sensor harness connector.
  2. Turn the ignition switch to RUN.

Are the shutters open?

--

Go to Step 5

Go to Step 3

3

  1. Disconnect the Radiator Shutter Control Valve harness connector.
  2. Use a DMM in order to inspect CKT 36 (LT GRN) for a short to ground.

Is a short present in CKT 36?

--

Go to Step 6

Go to Step 7

4

Repair the radiator shutters.

Is the repair complete?

--

System OK

--

5

Replace the Radiator Shutter Engine Coolant Temperature Sensor. Refer to Engine Coolant Temperature Sensor Replacement .

Is the repair complete?

--

System OK

--

6

Locate a short in CKT 36 (LT GRN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

7

Replace the Radiator Shutter Control Valve. Refer to Shutter Valve Replacement .

Is the repair complete?

--

System OK

--