- Check the fluid level in the reservoir tank. Marks are provided. Check when the engine is at operating temperature. Add a 50/50 mix to maintain performance.
- If it is necessary to add fluid, be sure to check level again soon.
- A coolant level that drops consistently is usually a sign of a small, hard-to-detect leak. In most cases, a loose or damaged hose is the cause of the coolant level drop. However, check the heater core. Check the coolant for droplets of engine oil and the engine oil for milky white contamination (emulsified oil). This would indicate an internal leak (blown head gasket or worse), which must be addressed.
Coolant found in late model trucks is normally a 50/50 mixture of ethylene glycol and water which can be used year round. Always use a good quality antifreeze with water pump lubricants, rust and other corrosion inhibitors, and acid neutralizers.
Also available is another type of antifreeze, propylene glycol, which is non-toxic.
Keep in mind that should you decide to use a propylene glycol antifreeze, you should follow the antifreeze manufacturer's instructions closely. Do NOT mix ethylene and propylene glycol together, as the benefits of the non-toxic propylene glycol would be lost. In the event you decide to change to propylene glycol, make sure to completely flush the cooling system of all ethylene glycol traces.