coolingWater Pump Torque Specsfor 2003 Chevrolet Astro 4.3L V6 Vortec · RWDUnitslb-ftNm8 fastenersSeqComponentTorqueAngle—Drain PetcockHand tight6 lb-ft · 8 Nm——Fan Bolts9 lb-ft · 12 Nm——Hose Clamps2 lb-ft · 3 Nm——Housing BoltsCritical10 lb-ft · 14 Nm——Pump BoltsCriticalTorque in sequence21 lb-ft · 28 Nm——Thermostat Housing Bolts11 lb-ft · 15 Nm——Timing Cover BoltsCriticalIf accessed15 lb-ft · 20 Nm——Water Pump BoltsCriticalTighten in criss-cross pattern18 lb-ft · 25 Nm—📝 Suggest a correction to this torque spec