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Home >> Cadillac >> 2013 >> Escalade Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Hybrid/EV Cooling System) >> Diagnostic Information and Procedures >> Hybrid Cooling System Loss of Coolant

Hybrid Cooling System Loss of Coolant

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Hybrid Cooling System Loss of Coolant

Step Action Yes No
DEFINITION: The cooling system is loosing coolant either internally or externally.
1 Inspect the coolant level.
Is the coolant at the proper level?
Go to Step 13  Go to Step 2 
2 Fill the cooling system to the proper level. Refer to Generator Control Module Cooling System Draining and Filling .
Is the action complete?
Go to Step 3  -
3 Overheating can cause a loss of coolant.
Is the Hybrid Cooling system overheating?
Go to Step 11  Go to Step 4 
4 Visually inspect the hoses, pipes and hose clamps.
Are any of the hoses, clamps or pipes leaking?
Go to Step 12  Go to Step 5 
5 Visually inspect the following components:
  • Coolant surge tank
  • Coolant pressure cap
  • Drive motor generator control module
  • Air separator
  • Radiator
  • Coolant pumps

Are any of the listed components leaking?
Go to Step 12  Go to Step 6 
6
  1. Pressure test the cooling system. Refer to Hybrid Cooling System Leak Test .
  2. With the cooling system pressurized, visually inspect the components listed in step 5.
Are any leaks present?
Go to Step 12  Go to Step 7 
7 Pressure test the coolant pressure cap. Refer to Hybrid Cooling System Pressure Cap Testing .
Does the coolant pressure cap hold pressure?
Go to Step 9  Go to Step 8 
8 Replace the coolant pressure cap.
Is the repair complete?
Go to Step 13  -
9
  1. Pressure test the cooling system. Refer to Hybrid Cooling System Leak Test .
  2. With the cooling system pressurized, remove the engine cooling system pressure cap.
Does the hybrid cooling system hold pressure?
- Go to Step 10 
10 Replace the surge tank. Refer to Radiator Surge Tank Replacement (Non-HP2) , Radiator Surge Tank Replacement (HP2) .
Is the repair complete?
Go to Step 13  -
11 Repair the hybrid cooling system overheating condition. Refer to Hybrid Cooling System Overheating (Electrical) .
Is the repair complete?
Go to Step 13  -
12 Repair or replace the leaking component. Refer to the appropriate repair.
Is the repair complete?
Go to Step 13  -
13 Operate the system in order to verify the repair.
Did you find and correct the condition?
System OK Go to Step 2