1. Rising Engine Temperatures If your temp gauge climbs on hills, in traffic, or while idling, check coolant levels, radiator airflow, hoses, and fan operation.
2. Coolant Leaks or Sweet Odors Puddles, coolant stains, or a sweet smell often point to leaking hoses, clamps, radiators, or water pumps that need attention.
3. Frequent Coolant Top-Offs Regularly adding coolant may indicate a pressure loss, failing component, or hidden leak within the cooling system.
4. Inconsistent Cab Heat Weak or fluctuating heat can signal low coolant, restricted flow, or heater system issues.
5. Corroded or Discolored Coolant Rusty, sludgy, or milky coolant is a sign it's time for a coolant flush and a closer inspection of related components.
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