07/07/2026
Ever been cruising all day with perfect temperatures… then watched the gauge climb the second you hit stop-and-go traffic?
We saw this firsthand at Goodguys Des Moines this weekend.
Thousands of incredible builds were out enjoying the event, but as cars moved through slow traffic, parade routes, and long lines, one problem kept showing up:
Cooling systems that work great on the highway can struggle when the airflow disappears.
So why does your car overheat in traffic but not on the highway?
The answer usually comes down to one thing:
👉 At highway speeds, your radiator gets constant airflow.
👉 In traffic, your fans become the only thing moving air through the radiator.
That’s where traditional ON/OFF fan setups can struggle.
A relay can only tell your fan one thing:
RUN 100% or TURN OFF.
But cooling demand isn’t always 0% or 100%
A PWM controller allows your fans to adjust speed based on actual cooling needs — helping maintain temperatures, reduce electrical spikes, and provide smarter control.
We broke down the problem (and how to solve it) in our latest article:
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