Workshop Repair and Service Manuals GMC SIERRA
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Engine Coolant - part 2

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Warning:Turning the surge tank pressure cap when the engine andradiator are hot can allow steam and scalding liquids to blow outand burn you badly. Never turn the surge tank pressurecap-—-even alittle-—-when the engine andradiator are hot.

The vehicle must be on a level surface. When the engine is cold, the coolant levelshould be at or above the MIN mark.

Checking Coolant (Van Models)

Engine Coolant

The coolant surge tank is located near the center of the engine compartment. SeeEngine Compartment Overviewfor location.

Warning:Turning the surge tank pressure cap when the engine andradiator are hot can allow steam and scalding liquids to blow outand burn you badly. Never turn the surge tank pressurecap-—-even alittle-—-when the engine andradiator are hot.

The vehicle must be on a level surface. When the engine is cold, the coolant levelshould be at the COLD FILL mark.

Adding Coolant (Pickup and Van Models)

Notice:If coolant is changed or added, always add enough to fill the system completely orengine damage may occur.

If more coolant is needed, add the proper DEX-COOL coolant mixture at the surge tank,but be careful not to spill it.

Warning:You can be burned if you spill coolant on hot engine parts.Coolant contains ethylene glycol and it will burn if the engineparts are hot enough. Do not spill coolant on a hot engine.

Notice:This vehicle has a specific coolant fill procedure. Failureto follow this procedure could cause the engine to overheat and beseverely damaged.

Warning:Steam and scalding liquids from a hot cooling system can blowout and burn you badly. They are under pressure, and if you turnthe coolant surge tank pressurecap-—-even alittle-—-they can come out at highspeed. Never turn the cap when the cooling system, including thecoolant surge tank pressure cap, is hot. Wait for the coolingsystem and coolant surge tank pressure cap to cool if you ever haveto turn the pressure cap.

If no coolant is visible in the surge tank, add coolant as follows:

Remove the coolant surge tank pressure cap when the cooling system, including thecoolant surge tank pressure cap and upper radiator hose, is no longer hot.

Turn the pressure cap slowly counterclockwise about one full turn. If a hiss is heard,wait for that to stop. A hiss means there is still some pressure left.

Keep turning the pressure cap slowly, and remove it.Slowly fill the coolant surge tank. Do not let the coolant level go above the seamin the tank until after the engine comes to operating temperature in Step 4.With the coolant surge tank pressure cap off, start the engine and let it run untilthe engine coolant temperature gauge indicates approximately 90°C (195°F).

By this time, the coolant level inside the coolant surge tank may be lower. If thelevel is lower, slowly add more of the proper mixture to the coolant surge tank untilit reaches the proper level.

On pickup models, slowly continue to add coolant so it goes into the non-pressurizedside (fender side) of the coolant surge tank until it reaches one-third of the capacity.

Fill the coolant surge tank to the following levels:

At or above the MIN mark on the pickup.To the COLD FILL mark on the van.Replace the pressure cap. Be sure the pressure cap is hand-tight and fully seated.Verify coolant level after the engine is shut off and the coolant is cold. If necessary,repeat coolant fill procedure Steps 1–6.

If the coolant level is still low after having followed these steps twice, have thecoolant system checked by a certified technician at the dealer for a possible leak.

Notice:If the pressure cap is not tightly installed, coolant lossand possible engine damage may occur. Be sure the cap is properlyand tightly secured.

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