Labels:text | screenshot | font | number | parallel OCR: Troubleshooting the Cooling System (cont.) Problem Cause Solution Coolant loss-boilover · Faulty head gasket . Replace head gasket . Cracked head, manifold, or block · Replace as necessary · Faulty radiator cap - Replace cap Coolant entry into crankcase or . Faulty head gasket · Replace head gasket cylinder(s) · Crack in head, manifold or block . Replace as necessary Coolant recovery system inoperative . Coolant level low · Replenish coolant to FULL mark + Leak in system . Pressure test to isolate leak and repair as necessary . Pressure cap not tight or seal · Repair as necessary missing, or leaking . Pressure cap defective · Replace cap . Overflow tube clogged or leaking Repair as necessary . Recovery bottle vent restricted . Remove restriction Noise · Fan contacting shroud · Reposition shroud and inspect engine mounts . Loose water pump impeller (on electric fans inspect assembly) · Glazed fan belt Replace pump Loose fan belt · Apply silicone or replace belt . Rough surface on drive pulley . Adjust fan belt tension . Water pump bearing worn Replace pulley · Remove belt to isolate. Replace · Belt alignment pump. . Check pulley alignment. Repair as necessary. No coolant flow through heater core . Restricted return inlet in water . Remove restriction pump . Heater hose collapsed or restricted . Remove restriction or replace hose . Restricted heater core Remove restriction or replace core . Restricted outlet in thermostat . Remove flash or restriction housing · Intake manifold bypass hole in . Remove restriction cylinder head restricted Faulty heater control valve . Replace valve · Intake manifold coolant passage . Remove restriction or replace restricted intake manifold NOTE: Immediately after shutdown, the engine enters a condition known as heat soak. This is caused by the cooling system being inoperative while engine temperature is still high. If coolant temperature rises above boiling point. expansion and pressure may push some coolant out of the radiator overflow tube. If this does not occur frequently it is considered normal.
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