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Engine Cooling System (VQ40DE): Diagnosis Suzuki Equator I

Cooling System (Mechanical) 5 illustrations ~576 words

Overheating Cause Analysis: Troubleshooting Chart

SymptomCheck items
Cooling system parts malfunctionPoor heat transferWater pump malfunctionWorn or loose drive belt
Thermostat stuck closed
Damaged finsDust contamination or paper clogging
Physical damage
Clogged radiator cooling tubeExcess foreign material (rust, dirt, sand, etc.)
Reduced air flowCooling fan does not operateFan assembly
High resistance to fan rotation
Damaged fan blades
Damaged radiator shroud
Improper engine coolant mixture ratio
Poor engine coolant qualityEngine coolant viscosity
Insufficient engine coolantEngine coolant leaksCooling hoseLoose clamp
Cracked hose
Heater pumpPhysical damage
Water pumpPoor sealing
Radiator capLoose
Poor sealing
RadiatorO-ring for damage, deterioration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tankCracked reservoir tank
Overflowing reservoir tankExhaust gas leaks into cooling systemCylinder head deterioration
Cylinder head gasket deterioration
Except cooling system parts malfunctionOverload on engineAbusive drivingHigh engine RPM under no load
Driving in low gear for extended time
Driving at extremely high speed
Powertrain system malfunction
Installed improper size wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air flowBlocked bumper
Blocked radiator grilleInstalled car brassiere
Mud contamination or paper clogging
Blocked radiator
Blocked condenserBlocked air flow
Installed large fog lamp

OVERHEATING CAUSE ANALYSIS - TROUBLESHOOTING CHART

Engine Coolant: System Inspection

WARNINGNever remove the radiator/reservoir cap when the engine is hot. Serious burns could occur from high pressure fluid escaping from the radiator or reservoir. Wrap a thick cloth around the cap. Slowly push down and turn it a quarter turn to allow built-up pressure to escape. Carefully remove the cap by pushing down and turning it all the way.

INSPECTION AFTER INSTALLATION

  1. Check for leaks of engine coolant. Refer to «ENGINE COOLANT: SYSTEM INSPECTION»(ref-375748-S37789399712010102800000) .
  2. Start and warm up engine. Visually check there are no leaks of engine coolant and A/T fluid.
  1. Check for leaks of the engine coolant. Refer to «ENGINE COOLANT: SYSTEM INSPECTION»(ref-375748-S37789399712010102800000) .
  2. Start and warm up the engine. Visually make sure that there are no leaks of the engine coolant.

Scheme 36

Scheme 36: REMOVAL
Scheme 36: REMOVAL
  1. Remove the engine front undercover using power tool. Refer to «FRONT BUMPER: REMOVAL AND INSTALLATION»(ref-375736-S25592846052010102800000)
  2. Partially drain engine coolant from radiator. Refer to «CHANGING ENGINE COOLANT»(ref-375748-S18727906452010102800000) . CAUTION: Perform this step when engine is cold. Do not spill engine coolant on drive belts.
  3. Release the radiator shroud (lower) (2) from the radiator shroud (upper) (1) and position aside. Release the tabs, pull radiator shroud (lower) (2) rearwards and down.
  4. Remove engine room cover. Refer to «ENGINE ROOM COVER: REMOVAL AND INSTALLATION»(ref-375721-S37910005862010102800000)
  5. Remove air duct. Refer to «AIR CLEANER AND AIR DUCT: REMOVAL AND INSTALLATION»(ref-375721-S30855040562010102800000)
  6. Remove upper radiator hose from radiator.
  7. Remove reservoir tank hose from radiator shroud (upper).
  8. Remove the radiator shroud (upper) bolts and remove the radiator shroud (upper). Refer to «RADIATOR: EXPLODED VIEW»(ref-375748-S03099360622010102800000) .
  9. Disconnect harness connector from fan motor.
  10. Remove the bolt and remove the fan grille and motor assembly.
  1. Check for leaks of engine coolant. Refer to «ENGINE COOLANT: SYSTEM INSPECTION»(ref-375748-S37789399712010102800000) .
  2. Start and warm up engine. Visually check there are no leaks of engine coolant.

Scheme 37

Scheme 37: Water Inlet and Thermostat Assembly: Exploded View
Scheme 37: Water Inlet and Thermostat Assembly: Exploded View

Scheme 38

Scheme 38: REMOVAL
Scheme 38: REMOVAL
  1. Remove the engine under cover. Refer to «ENGINE ROOM COVER: REMOVAL AND INSTALLATION»(ref-375721-S37910005862010102800000)
  2. Drain engine coolant from the radiator. Refer to «CHANGING ENGINE COOLANT»(ref-375748-S18727906452010102800000) . CAUTION: Perform this step when engine is cold. Do not spill engine coolant on drive belts.
  3. Remove air duct and resonator assembly. Refer to «AIR CLEANER AND AIR DUCT: REMOVAL AND INSTALLATION»(ref-375721-S30855040562010102800000)
  4. Remove the radiator hose (upper) from the radiator.
  5. Remove the coolant reservoir hose from the radiator.
  6. Remove the fan shroud (lower) and (upper). Refer to «Radiator: Exploded View»(ref-375748-S03099360622010102800000)
  7. Disconnect radiator hose (lower) and oil cooler hose from water inlet and thermostat assembly.
  8. Remove water inlet and thermostat assembly. CAUTION: Do not disassemble water inlet and thermostat assembly. Replace water inlet and thermostat assembly as a unit, if necessary.

Scheme 39

Scheme 39: INSPECTION AFTER REMOVAL
Scheme 39: INSPECTION AFTER REMOVAL
  1. Check valve seating condition at ordinary room temperatures. It should seat tightly.
  2. Check valve operation. Place a thread so that it is caught in the valve of the thermostat. Immerse fully in a container filled with water. Heat while stirring. The valve opening temperature is the temperature at which the valve opens and falls from the thread. Continue heating. Check the full-open lift amount. After checking the full-open lift amount, lower the water temperature and check the valve closing temperature. THERMOSTAT REFERENCE CHART Thermostat Standard Valve opening temperature 80.5 - 83.5 °C (177 - 182 °F) Full-open lift amount 8.6 mm / 95 °C (0.339 in / 203 °F) Valve closing temperature 77 °C (171 °F) If valve seating at ordinary room temperature, or measured values are out of standard, replace water inlet and thermostat assembly.
  1. Check for leaks of engine coolant. Refer to «ENGINE COOLANT: SYSTEM INSPECTION»(ref-375748-S37789399712010102800000) .
  2. Start and warm up engine. Visually check for leaks of engine coolant.

Scheme 40

Scheme 40: Water Outlet and Water Piping: Exploded View
Scheme 40: Water Outlet and Water Piping: Exploded View
  1. Check for leaks of engine coolant. Refer to «ENGINE COOLANT: SYSTEM INSPECTION»(ref-375748-S37789399712010102800000) .
  2. Start and warm up engine. Visually check for leaks of engine coolant.

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