Loss of Coolant. Pontiac Sunfire 2000

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2000 🢒 Sunfire 🢒 Engine 🢒 Engine Controls - 2.4L 🢒 Loss of Coolant

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 Cooling Fan Schematics . Does the lamp stay on?	--	--	System OK

Step	Action	Value(s)	Yes	No
1	Check for an external coolant leak. 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

Step

Action

Value(s)

Yes

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

Is the cooling system to the proper pressure?

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?

Repair the cooling system components as necessary.

Is there still a loss of coolant?

System OK