Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2025TRAVERSE HIGH COUNTRY, FWDREPAIR AND DIAGNOSISENGINE MECHANICALCOOLING SYSTEM (MECHANICAL)ENGINE COOLING SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESENGINE FAILS TO REACH NORMAL OPERATING TEMPERATURE

2025 Chevrolet Traverse High Country, FWD

Engine Fails To Reach Normal Operating Temperature

2025 Chevrolet Traverse High Country, FWDSECTION Engine Fails To Reach Normal Operating Temperature

Step	Action	Yes	No
DEFINITION: The engine temperature lamp comes on and stays on, or temperature gauge shows hot, or coolant overflows from the surge tank onto the ground while the engine is running.
1	Check for a loss of coolant. Loss of Coolant Is there a loss of coolant?	Go to Step 2	Go to Step 3
2	Fill the system to the specified level. Cooling System Draining and Filling (GE 47716) Does the engine still overheat?	Go to Step 3	System OK
3	Check for kinked or pinched surge tank Hose s, especially at the radiator. Are any surge tank Hose s kinked or pinched?	Go to Step 4	Go to Step 5
4	Relieve any kinks by rerouting the Hose s. Replace the Hose s, if necessary. Does the engine still overheat?	Go to Step 5	System OK
5	Check for loose, missing, or damaged radiator air seals or deflectors. Are there any loose, missing, or damaged radiator air seals or deflectors?	Go to Step 6	Go to Step 7
6	Repair or replace any loose, missing, or damaged radiator air seals or deflectors. Does the engine still overheat?	Go to Step 7	System OK
7	Check the coolant concentration. Does the coolant concentration test correctly?	Go to Step 9	Go to Step 8
8	Replace the coolant, if necessary. Cooling System Draining and Filling (GE 47716) Does the engine still overheat?	Go to Step 9	System OK
9	NOTE: Use the correct pressure cap. Check the system for loss of pressure. Radiator Surge Tank Cap Testing Is there a loss of pressure?	Go to Step 10	Go to Step 11
10	Repair any leaks, as necessary. Does the engine still overheat?	Go to Step 11	System OK
11	Check for a faulty engine coolant temperature sensor. Is the engine coolant temperature sensor faulty?	Go to Step 12	Go to Step 13
12	Replace the engine coolant temperature sensor. Engine Coolant Temperature Sensor Replacement - Cylinder Head , or Engine Coolant Temperature Sensor Replacement - Engine Block , or Engine Coolant Temperature Sensor Replacement - Water Pump Module Outlet Does the engine still overheat?	Go to Step 13	System OK
13	Check the radiator for any air flow obstructions or bent fins. Is there any airflow obstruction or bent fins?	Go to Step 14	Go to Step 15
14	Remove or relocate add-on parts that block air flow to the radiator. Clean any debris from the radiator core. Does the engine still overheat?	Go to Step 15	System OK
15	Check for any blocked cooling system passages. Are there any blocked cooling system passages?	Go to Step 16	Go to Step 17
16	Remove any obstruction. Flush the cooling system, as required. Flushing Refill the coolant. Cooling System Draining and Filling (GE 47716) Does the engine still overheat?	Go to Step 17	System OK
17	Check for an inoperative cooling fan. Is the cooling fan inoperative?	Go to Step 18	Go to Step 19
18	Replace the cooling fan. Engine Coolant Fan Replacement Does the engine still overheat?	Go to Step 19	System OK
19	Check for a thermostat that is stuck closed. Is the thermostat stuck closed?	Go to Step 20	Go to Step 21
20	Replace the engine coolant temperature sensor.. Engine Coolant Temperature Sensor Replacement - Cylinder Head , or Engine Coolant Temperature Sensor Replacement - Engine Block , or Engine Coolant Temperature Sensor Replacement - Water Pump Module Outlet Does the engine still overheat?	Go to Step 21	System OK
21	Check for a faulty water pump. The impeller blades may be eroded or broken. Is the water pump faulty?	Go to Step 22	-
22	Replace the water pump. Water Pump Module Replacement Does the engine still overheat?	-	System OK

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.