Loss of Coolant. Chevrolet PJJ 2000

For 1990-2009 cars

## Loss of Coolant Low Coolant Lamp On

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Check for a faulty low coolant sensor. Is the sensor faulty? | -- | Go to Step 2 | Go to Step 3
2 | Replace the surge tank. Refer to Radiator Surge Tank Replacement . Does the low coolant lamp continue to stay on? | -- | Go to Step 3 | System OK
3 | Check for a faulty circuit. Is the circuit faulty? | -- | Go to Step 4 | --
4 | Repair the circuit. Refer to Engine Electrical Schematic References . Does the lamp stay on? | -- | -- | System OK

## Loss of Coolant Coolant Loss

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---

1

1. Check for an external coolant leak.
2. Do a pressure or dye test on the cooling system. Refer to Cooling System Leak Testing .

Is the cooling system to the proper pressure?

--

Go to Step 2

Go to Step 3

2 | Check for an internal coolant leak. Do a cylinder leak test. Refer to Oil Leak Diagnosis in Engine Mechanical. Is there an internal loss of coolant? | -- | Go to Step 3 | --
3 | Repair the cooling system components as necessary. Is there still a loss of coolant? | -- | -- | System OK