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9.15.8 Preheater – Function and leak check
Preconditions
☑ Preheater is switched on.
WARNING
Coolant is hot and highly pressurized.
Risk of injury! Risk of scalding!
• Allow engine to cool down.
• Wear protective clothing, protective gloves, and safety glasses / facial protection.
WARNING
Coolant contains antifreeze and is toxic.
Risk of poisoning and slipping!
• Avoid contact with eyes and skin.
• Do not inhale vapors or mist, wear breathing protection.
• Do not eat, drink, smoke when working with antifreeze.
• Wear protective clothing, protective gloves and goggles/safety mask.
• Wipe up escaped/spilled coolant immediately.
Function check
Note:
The preheater operates properly if the measured value of the coolant temperature is within the control range
of the thermostat.
1.
Check coolant preheating temperature.
2.
Contact Service if the temperatures are out of normal range.
Leak check
1.
Check unit for leaks at coolant inlet and coolant outlet.
2.
Tighten leaking connections.
MS15065/01E 2019-01 | Coolant System, General, High-Temperature Circuit | 293
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