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Home >> Cadillac >> 2011 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1284 (Engine Cooling System) >> Diagnostic Information and Procedures >> Engine Overheating

Engine Overheating

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Step Action Yes No
1 Inspect for a missing or damaged radiator side or upper baffle and/or radiator air deflector.
Is the baffle and/or deflector missing or damaged?		 Go to Step 8  Go to Step 2 
2 Inspect for a loss of coolant.
Is there a loss of coolant?		 Go to Step 3  Go to Step 4 
3 Fill the system to the specified level.
Does the engine overheat?		 Go to Step 4  System OK
4 Inspect for low temperature protection.
Is the coolant to the correct concentration?		 Go to Step 5  Go to Step 8 
5 Inspect for a loss of cooling system pressure.
Is there a loss of system pressure?		 Go to Step 8  Go to Step 6 
6 Inspect for a faulty engine coolant temperature (ECT) sensor. Refer to DTC P0117 or P0118 .
Is the sensor operating properly?		 Go to Step 7  Go to Step 8 
7 Inspect for the following:
  • Damaged coolant surge tank
  • Leaking hose
  • Bad/incorrect surge tank or radiator cap

Were any of the above found?		 Go to Step 8  Go to Step 3 
8 Repair or install new parts as necessary, then retest.
Does the engine overheat?		 Go to Step 9  System OK
9 Inspect for incorrect drive belt tension.
Is the belt tension correct?		 Go to Step 10  Go to Step 8 
10
  1. Remove the water pump. Refer to Water Pump Replacement (LU3)  or Water Pump Replacement (LMM)  or Water Pump Replacement (LH6, LY2, LY5, and LMG)  or Water Pump Replacement (LY6, L76, and L92)  or Water Pump Replacement (LFA) .
  2. Inspect for a damaged water pump shaft/hub.
Is the water pump driveshaft damaged or is the seal leaking?		 Go to Step 8  Go to Step 11 
11 Inspect for obstructed radiator air flow or bent radiator fins.
Is the radiator air flow obstructed?		 Go to Step 8  Go to Step 12 
12 Inspect for blocked cooling system passages.
Are the cooling system passages blocked?		 Go to Step 8  Go to Step 13 
13 Inspect the thermostat. Refer to Thermostat Diagnosis .
Is the thermostat stuck in the closed position?		 Go to Step 15  Go to Step 16 
14 Replace the thermostat. Refer to Engine Coolant Thermostat Housing Replacement (LFA, LH6, LMG, LY2, LY5, LY6) .
Does the engine overheat?		 Go to Step 16  System OK
15 Inspect the radiator cooling capacity.
Is the proper sized radiator being used on the vehicle?		 Go to Step 3  Go to Step 17 
16 Consult the current parts catalog and replace the radiator. Refer to Radiator Replacement (4.3L, 4.8L, 5.3L, and 6.0L)  or Radiator Replacement (HP2)  or Radiator Replacement (LMM) .
Is the repair complete?		 System OK -
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