Overheating After Water Pump Replacement
Contents
1. CARDONE af Wa NE XN Supporting Today s Professional Technician Application 2003 Chevrolet Express 2003 GMC Savana with 4 8L 5 3L or 6 0L Gen III V8 Engine VIN s V T U RPO s LR4 LM7 LQ4 Problem Major engine overheating after replacing water pump Cause Because the engine cooling system no longer uses a pressurized coolant surge tank engine overheating could result if a special bleeding procedure is not performed After pump replacement or following a condition where the engine coolant has been drained if engine coolant is only added through the radiator neck and engine coolant overflow reservoir the engine coolant may not flow beyond the closed thermostat located on the engine at the lower radiator hose connection Although the engine coolant level may appear full in the radiator neck the system may be 3 785 to 5 678 liters 4 to 6 quarts low and a major engine overheat condition may occur GM Bulletin No 02 06 02 008 Date September 2002 Fill procedure see service manual for detailed steps CAUTION Allow engine to cool before opening system 1 Using a hose clamp tool reposition upper radiator hose clamp and remove the upper radiator hose CAUTION Relieve system pressure before removing hose Remove the coolant air bleed hose from the radiator Place a funnel into the upper radiator hose Important Use a 50 50 mixture of antifreeze refer to vehicle service manual for correct coolant2. and deionized water Slowly fill the cooling system through the upper radiator hose with a 50 50 coolant mixture until the coolant comes out the coolant air bleed hose Connect the upper radiator hose to the radiator Using the hose clamp tool position the radiator hose clamp into the original position on the hose Connect the coolant air bleed hose to the radiator Fill the radiator with coolant through the filler neck 9 Install the coolant pressure cap 10 Fill the coolant overflow bottle to the full line 11 Start the engine 12 Run the engine at 2000 2500 RPM until the engine reaches normal operating temperature 13 Allow the engine to idle for 3 minutes frequently checking for proper coolant temperature 14 Shut the engine off 15 Allow the engine to cool 16 Top off the coolant as necessary 17 Inspect the concentration of the engine coolant using a suitable coolant tester 18 Rinse away any excess coolant from the engine and the engine compartment 19 Inspect the cooling system for leaks This PROTECH bulletin is supplied as technical information only and is not an authorization for repair For other ProTech publications visit www cardone com CARDONE Industries Inc 5501 Whitaker Ave Philadelphia PA 19124 1799 JD JE A9238 PT 58 0013
Download Pdf Manuals
Related Search