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IMPORTANT:
Do not drain cooling system to protect against freezing. The heater does not drain completely, so damage would result.
Do not use a high silicate automotive coolant.
If after testing, if it is determined that there is insufficient antifreeze to protect the system against freezing, do the following:
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Use a coolant specified in the DIESEL ENGINE COOLANT in the Fuel, Coolant, and Lubricants section.
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After adding antifreeze, turn heater on and run engine until it reaches operating temperature. This mixes the solution and circulates it through the system.
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Test coolant mixture to determine level of protection.
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