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For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Savana 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Engine Coolant Temperature Gauge Always Hot

Engine Coolant Temperature Gauge Always Hot Domestic

Step

Action

Value(s)

Yes

No

1

Was the Instrument Cluster System Check performed?

--

Go to Step 2

Go to Instrument Cluster System Check

2
  1. Operate the engine.
  2. Compare the actual engine coolant temperature and the temperature indicated by the instrument cluster's temperature gauge.

Are the engine coolant temperature and the indicated coolant temperature within the specified value of each other?

17°C (30°F)

Go to Step 3

Go to Step 4

3

The temperature gauge functions properly.

Inspect the engine cooling system for operating conditions, as needed.

Does the temperature gauge still always indicate HOT?

--

Go to Step 4

Go to Instrument Cluster System Check

4
  1. Disconnect the connector at the engine coolant temperature gauge sensor.
  2. Place the ignition switch in the RUN position.

Does the temperature gauge indicate COLD?

--

Go to Step 5

Go to Step 6

5

Replace the engine coolant temperature gauge sensor.

Does the temperature gauge still always indicate HOT?

--

Go to Step 6

Go to Instrument Cluster System Check

6
  1. Disconnect the connector at the instrument cluster.
  2. Connect a J 39200 between the instrument cluster connector, cavity B9 for CKT 35 (DK GRN), and ground.

Is continuity present?

--

Go to Step 7

Go to Step 8

7

Repair the short to ground in CKT 35 (DK GRN) between the engine coolant temperature gauge sensor and the instrument cluster.

Does the temperature gauge operate properly?

--

Go to Instrument Cluster System Check

--

8

Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Does the temperature gauge operate properly?

--

Go to Instrument Cluster System Check

--

Engine Coolant Temperature Gauge Always Hot Export

Step

Action

Value(s)

Yes

No

1

Was the Instrument Cluster System Check performed?

--

Go to Step 2

Go to Instrument Cluster System Check

2
  1. Operate the engine.
  2. Inspect the actual engine coolant temperature.
  3. Observe the instrument cluster temperature gauge temperature.

Are the actual engine coolant temperature and the indicated engine coolant temperature within 17°C (30°F) of each other?

--

Go to Step 3

Go to Step 4

3

Inspect the engine cooling system for operating problems.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

4
  1. Disconnect the connector at the engine coolant temperature gauge sensor.
  2. Turn the ignition switch to the RUN position

Does the temperature gauge indicate COLD?

--

Go to Step 5

Go to Step 6

5

Replace the engine coolant temperature gauge sensor.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

6
  1. Disconnect the connector at the instrument cluster.
  2. Connect a J 39200 between the following components:
    3. • The instrument cluster connector cavity B9 for the CKT 35 (DK GRN) wire
    • Ground

Is continuity present?

--

Go to Step 7

Go to Step 8

7
  1. Locate the short to ground on the CKT 35 (DK GRN) wire between the following components:
    2. • The engine coolant temperature gauge sensor
    • The instrument cluster
  2. Repair the short to ground on the CKT 35 (DK GRN) wire between the following components:
    3. • The engine coolant temperature gauge sensor
    • The instrument cluster

Is the repair complete?

--

Go to Instrument Cluster System Check

--

8

Replace the instrument cluster.

Is the repair complete?

--

Go to Instrument Cluster System Check

Go to Step 1