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Home >> GMC >> 1991 >> Forward Control 6.2 J, Automatic >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Remove/Install/Overhaul >> Turbocharger >> Charge Air System Bleeding

Charge Air System Bleeding

  1. Open petcock on charge air cooler radiator. Fill charge air cooler radiator with a 56/44 mixture of coolant and distilled water. When coolant flows out of drain hole, close petcock.
  2. Add coolant mixture to air charge cooler until full. Remove charge air cooler pump relay located near coil assembly. Turn ignition on. Install jumper wire between charge air cooler relay terminals "A" and "B" to operate charge air cooler pump.
  3. While pump is operating, add coolant mixture to system until system is full. Install charge air cooler pressure cap.
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