When your 2023 Kia Telluride's engine temperature spikes during stop-and-go traffic but returns to normal when moving, the cooling system is struggling with the specific demands of heavy traffic. This pattern reveals fan or airflow issues.
Why Traffic Causes Temperature Spikes
During normal driving, air flows through the radiator from vehicle motion. In stop-and-go traffic, this airflow stops, and the electric fans become the sole cooling source. If fans can't keep up, temperature rises. Once you start moving again, airflow resumes and temperature drops.
Fan System Importance
The Telluride relies on electric fans to maintain cooling at low speeds and stops. These fans should run at high speed when the engine is hot or AC is on. If one fan isn't working, or fans aren't running at full speed, traffic situations expose this weakness.
AC Load Factor
Running AC in traffic adds both heat (condenser heat) and reduces airflow (condenser blocking radiator). The engine also works harder running the compressor. Summer traffic with AC is maximum cooling system stress.
Diagnostic Approach
Verify both fans run when AC is on and engine is warm. Check fan speed—they should run fast when needed, not just slowly. Inspect the condenser and radiator for debris. Check coolant level and system pressure.
Solutions
Replace or repair non-functioning fans or relays. Clean debris from condenser and radiator. Ensure coolant is at proper level. Consider turning off AC temporarily if stuck in severe traffic and temperature spikes—this reduces load while waiting for traffic to move.