GM SIN HDC — 1. Open the radiator cap and open the drain cocks of the engine crankcase and radiator to

For the GM SIN HDC.

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Procedure

1. 2. Close the drain cocks and pour coolant into radiator. Run the engine until the coolant is heated ©
2. 3. Ifthere is considerable scale or rust, pour in a cleaning solution and run the engine until the

Source: manual:GM_KEM_8.74L_Manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.