2018 Chevrolet Cruze Coolant Surge Tank: Location, Cold Level & Safety

Where is the Cruze surge tank?

The 2018 US Chevrolet Cruze owner's manual states that the coolant surge tank is in the engine compartment on the driver side. It points owners to the under-hood diagram on page 262; the book's coolant illustration identifies the 1.4L LE2 gasoline and 1.6L LH7 diesel examples.

This location statement is from the 2018 US manual. A photograph of another Cruze model year, a previous generation or a non-US engine is not equivalent evidence for the same hose layout or reservoir part.

• Confirm this is a 2018 US Cruze, not an earlier Cruze Limited or another market version.
• With the engine off and cool, find the coolant surge tank using the manufacturer's Engine Compartment Overview.
• Do not confuse the washer-fluid filler or brake/clutch reservoir with the coolant pressure system.

What does the manual say about checking the level?

The Cruze manual specifies a level surface and directs the owner to determine whether coolant is visible through the tank. Its indicated fill-level mark controls; do not substitute the MIN/MAX location from a Ford or another Chevrolet model.

If coolant is boiling, wait for the system to cool without opening the cap. If no coolant is visible in the tank, the manual explicitly directs owners to contact their dealer, rather than beginning a generic running-engine refill procedure.

• Park on a level surface and allow the cooling system to become fully cold.
• Record a photograph of the tank and the indicated mark.
• If coolant cannot be seen, or the level keeps dropping, arrange diagnosis instead of guessing a failed cap or plastic tank.

Which coolant does the 2018 US Cruze specify?

For the affected 2018 US Cruze manual, General Motors specifies a 50/50 mixture of clean drinkable water and DEX-COOL coolant meeting GM standard GMW3420. This is a model-year-specific manufacturer requirement, not an instruction to mix arbitrary coolant colors.

The manual warns that the vehicle uses a specific coolant fill procedure and that ignoring it can cause overheating and system damage. This guide therefore does not reproduce an engine-running fill/air-purge procedure or prescribe an unverified volume.

• Confirm the coolant specification using your own vehicle's manual and labels.
• Do not add plain water as routine service or rely on an unverified universal stop-leak additive.
• Have a trained workshop perform full refill/air removal when the circuit has drained or its condition is unknown.

Does a wet or cracking tank prove it needs replacing?

No. A visible stain could originate from the cap, hose connection, coolant surge tank or a different source. General Motors' fluid-handling warnings do not establish that all 2018 Cruze tanks have a defect or that any specific replacement is compatible.

Ask for the confirmed origin, exact replacement part by VIN and verified leak/cold-level check after repair. A low level alone does not prove the reservoir body is faulty.