GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 Jimmy - 2WD 🢒 Engine 🢒 Engine Electrical 🢒 Engine Coolant Temperature Gage Inaccurate or Inoperative

Step

Action

Value(s)

Yes

No

1

Was the IPC Diagnostic System Check performed?

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Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2
  1. Turn the ignition switch to the ON position.
  2. Ensure that the engine is running.
  3. Install the scan tool.
  4. Select the displayed coolant temperature display on the scan tool.
  5. Compare the displayed coolant temperature data on the scan tool to the temperature gauge reading on the cluster.

Are the temperatures approximately equal or within 25° of the specified value?

87°C

(190°F)

Go to Step 3

Go to Step 6

3

Read the monitored coolant temperature from the scan tool.

Is the monitored coolant temperature reading within the specified range?

38-127°C

100-260°F)

Go to Step 4

Go to Step 5

4

Compare the monitored coolant temperature with the displayed coolant temperature.

Are the temperatures approximately equal or within 11°C (25°F)?

--

Go to Step 5

Go to Step 6

5
    • If the monitored coolant temperature is less than 38°C (100°F), the gauge should be at or near the lowest reading.
    • If the monitored coolant temperature is greater than 127°C (260°F), the gauge should be at or near the maximum reading.

Is the gauge reading correct?

--

Go to Engine Controls

Go to Step 6

6

Replace the IP cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

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