SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSISUZU2006ASCENDER S, 5.3 M, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 648 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESENGINE OVERHEATING
2006 Isuzu Ascender S, 5.3 M, 4WD

Engine Overheating

2006 Isuzu Ascender S, 5.3 M, 4WDSECTION Engine Overheating
WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
Step Action Value(s) Yes No
DEFINITION: The engine temperature lamp comes on and stays on, the temperature gauge shows hot or coolant overflows from the coolant recovery reservoir onto the ground while the engine is running.
1 Check for a loss of coolant.
Has there been a loss of coolant?		 - Go to Step 2  Go to Step 3 
2 Refer to Loss of Coolant .
Does the engine still overheat?		 - Go to Step 3  System OK
3 Check for a loss of system pressure.
Use the J 24460-01  Cooling System Pressure Tester. See Special Tools .
Has there been a loss of system pressure?		 - Go to Step 4  Go to Step 5 
4 Correct the system pressure.
Does the engine still overheat?		 - Go to Step 5  System OK
5
  1. Check for low coolant protection.
  2. Make sure that the solution is at the specified temperature.
Is there low coolant protection?		 -37°C (-34°F) Go to Step 6  Go to Step 7 
6 Correct as necessary.
Does the engine still overheat?		 - Go to Step 7  System OK
7
  1. Check the accessory drive belt tension.
  2. Check the tensioner. Refer to Drive Belt Tensioner Diagnosis .
Is the tensioner working properly and the tension correct?		 - Go to Step 9  Go to Step 8 
8 Replace the tensioner. Refer to Drive Belt Tensioner Diagnosis .
Does the engine still overheat?		 - Go to Step 9  System OK
9 Check to see if the timing is retarded by a malfunctioning powertrain control module (PCM).
Is the timing retarded by a malfunctioning PCM?		 - Go to Step 10  Go to Step 11 
10 Correct as necessary.
Does the engine still overheat?		 - Go to Step 11  System OK
11 Check to see if any of the radiator fins are obstructed.
Are any of radiator fins obstructed?		 - Go to Step 12  Go to Step 13 
12
  1. Remove or relocate any add-on parts that block air to the radiator.
  2. Remove any debris from the radiator fins.
Does the engine still overheat?		 - Go to Step 13  System OK
13 Check to see if any of the cooling system passages are blocked by rust or scale.
Are any of the cooling system passages blocked by rust or scale?		 - Go to Step 14  Go to Step 15 
14
  1. Drain the cooling system. Refer to Cooling System Draining and Filling (LY7 GE 47716 Fill)  or Cooling System Draining and Filling (LNJ GE 47716 Fill)  or Cooling System Draining and Filling (LNJ Static Fill)  or Cooling System Draining and Filling (LY7 Static Fill) .
  2. Flush the cooling system. Refer to Coolant System Flushing .
  3. Repair as necessary.
Does the engine still overheat?		 - Go to Step 15  System OK
15 Check for a pinched or kinked coolant recovery reservoir hose.
Is the surge tank hose pinched or kinked?		 - Go to Step 16  Go to Step 17 
16 Replace or reroute the hose as necessary. Refer to Radiator Surge Tank Inlet Hose/Pipe Replacement (LNJ)  or Radiator Surge Tank Inlet Hose/Pipe Replacement (LY7) .
Does the engine still overheat?		 - Go to Step 17  System OK
17 Check for an inoperative cooling fan. Refer to Cooling Fan Inoperative (3.6L)  or Cooling Fan Inoperative (3.4L) .
Are there any inoperative cooling fans?		 - Go to Step 18  Go to Step 19 
18 Repair or replace the electric cooling fans as necessary. Refer to Engine Coolant Fan Motor Replacement .
Does the engine still overheat?		 - Go to Step 19  System OK
19 Check for a loose, damaged, and/or missing deflector.
Are there any loose, damaged, or missing deflectors?		 - Go to Step 20  Go to Step 21 
20 Replace the deflectors.
Does the engine still overheat?		 - Go to Step 21  System OK
21 Check to see if the thermostat is stuck in the closed position.
Is the thermostat stuck in the closed position?		 - Go to Step 22  Go to Step 23 
22 Replace the thermostat. Refer to Engine Coolant Thermostat Replacement (LY7)  or Engine Coolant Thermostat Replacement (LNJ) .
Does the engine still overheat?		 - Go to Step 23  System OK
23 Check for a faulty coolant pump.
Is the coolant pump faulty?		 - Go to Step 24  Go to Step 25 
24 Replace the water pump. Refer to Water Pump Replacement (RPO LNJ)  or Water Pump Replacement (RPO LY7) .
Does the engine still overheat?		 - Go to Step 25  System OK
25 Check for an incorrect radiator.
Is the radiator correct?		 - Go to Step 26  -
26 Install the correct radiator. Refer to Radiator Replacement .
Does the engine still overheat?		 - - System OK
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.