Engine Overheating - Suzuki XL7 2007 Service Manual

1F-15 Engine Cooling System:

Engine Overheating

Step
DEFINITION: Either of the following conditions indicate a probable engine overheat condition.
• The engine temperature gage is in the red (overheat) zone and/or the engine temperature indicator is ON.
• Hot engine coolant overflows from the coolant recovery reservoir and/or radiator cap onto the ground while the
engine is running.
1. Inspect and fill the cooling system, as necessary. Refer to
"Draining and Filling Cooling System (LY7 GE 47716 Fill)"
"Draining and Filling Cooling System (LY7 Static Fill)".
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2. Inspect the cooling system for leaks, as necessary.
3. Repair the cooling system leaks, as necessary.
Has the inspection/repair been performed?
1. Start the engine and allow the engine to run at
approximately 1,200 RPM.
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2. Use the Scan Tool in order to verify the overheat condition.
Does the Scan Tool verify the engine overheat condition?
1. Verify that the cooling fans are operating properly.
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2. Repair the cooling fan system, as necessary.
Does the engine still overheat?
Perform the following inspections:
• Inspect the radiator and the A/C condenser cooling fins for
debris or any other obstruction.
• Inspect the drive belt system and the drive belt tensioner for
proper operation in order to ensure that the coolant pump is
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rotating properly.
• Inspect for loose, damaged and/or missing air deflector(s).
• Check for a pinched or kinked cooling system hose.
• Repair the systems as necessary.
Does the engine still overheat?
Inspect the thermostat for proper operation. Refer to
5 "Thermostat Diagnosis".
Is the thermostat operating properly?
Replace the thermostat. Refer to "Thermostat Replacement".
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Does the engine still overheat?
NOTE
Excessive coolant freeze point protection MAY
cause the coolant to boil at low temperatures.
1. Inspect for the proper coolant concentration (mixture).
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Correct the coolant concentration as necessary.
2. Remove the radiator cap.
3. Start the engine and inspect for a constant flow of air
bubbles in the engine coolant.
Is there a constant flow of air bubbles in the engine coolant?
Action Yes
Go to Step 2
Go to "Diagnostic
System Check -
Go to Step 3
Vehicle Diagnostic
Information: "
Go to Step 4 System OK
Go to Step 5 System OK
Go to Step 7 Go to Step 6
Go to Step 7 System OK
Go to Step 8 Go to Step 9
No
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