GMC Terrain: Cooling System / Checking Coolant

The vehicle must be on a level surface when checking the coolant level.

GMC Terrain. Checking Coolant

Check to see if coolant is visible in the coolant surge tank. If the coolant inside the coolant surge tank is boiling, do not do anything else until it cools down. If coolant is visible but the coolant level mark is not visible, add a 50/50 mixture of clean, drinkable water and DEX-COOL coolant at the coolant surge tank to the top rib on the middle of the tank, but be sure the cooling system is cool before this is done. See Engine Overheating.

The coolant surge tank is located in the engine compartment on the driver side of the vehicle. See Engine Compartment Overview.

    What to Use

    Warning Plain water, or other liquids such as alcohol, can boil before the proper coolant mixture will. With plain water or the wrong mixture, the engine could get too hot but there would not be an overheat warning...

    How to Add Coolant to the Coolant Surge Tank

    Warning Steam and scalding liquids from a hot cooling system are under pressure. Turning the pressure cap, even a little, can cause them to come out at high speed and you could be burned...

    Other information:

    GMC Terrain 2018-2022 Owners Manual: Reducing Speed While Using Cruise Control


    If the cruise control system is already activated: Press and hold –SET until the desired lower speed is reached, then release it. To slow down in small increments, briefly press –SET. For each press, the vehicle goes about 1 km/h (1 mph) slower...

    GMC Terrain 2018-2022 Owners Manual: Seat Adjustment


    Warning You can lose control of the vehicle if you try to adjust a driver seat while the vehicle is moving. Adjust the driver seat only when the vehicle is not moving. To adjust the seat position: Pull the handle at the front of the seat cushion to unlock it...

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