GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2004 🢒 Vibe - FWD 🢒 Engine 🢒 Engine Controls - 1.8L (LNK) 🢒 Engine Fails To Reach Normal Operating Temperature

Step

Action

Yes

No

1

Inspect the thermostat for the following conditions:

    • The thermostat remains open.
    • An incorrect thermostat is installed.

Does either of the above conditions exist?

Go to Step 2

Go to Step 3

2

Install a new thermostat of the correct type and heat range.

Does the engine still fail to reach the normal operating temperature?

Go to Step 3

System OK

3

Inspect the coolant level.

Is the coolant level below the ADD mark?

Go to Step 4

Go to Step 5

4

Add coolant.

Does the engine still fail to reach the normal operating temperature?

Go to Step 5

System OK

5

Inspect the radiator for the following conditions:

    • Plugging
    • A faulty cap

Does either of the above conditions exist?

Go to Step 6

Go to Step 7

6
  1. Inspect the radiator or the cap.
  2. Replace the cap as necessary.

Does the engine reach the normal operating temperature?

System OK

Go to Step 7

7

Inspect the cylinder head.

Is the cylinder head or block cracked or plugged?

Go to Step 8

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8

Repair the cylinder head or block as necessary.

Does the engine reach the normal operating temperature?

System OK

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