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GM SIN HDC — Coolant Cont.

For the GM SIN HDC.

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Procedure

  1. 4. Continue to idle the engine for about 30 minutes.
  2. 5. After stopping the engine, open the drain cocks of the engine crankcase and radiator to drain

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.