6.7 hum or small fan noise after shutoff

Wrangler98

Tremor Fiend
Joined
Nov 23, 2020
Messages
403
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Location
Maine
Current Ride
2021 tremor 6.7
I lock my truck with it off and I hear a small fan noise under the hood. Lasts probably 5 to 10 minutes. Is this normal?
 
Yup!! No shit lol makes sense why i hear it every time I lock it
So what exactly are those fans doing?
Clearing condensation?
Cooling a ballast?
Something else?
 
You might be hearing the def pump clearing the lines out. When you shut the engine off they pump the def back to the tank to prevent possible freezing in the lines.
 
My noise is definitely the LEDs thanks to treefiddy. Stick my ear against each lense and you can definitely tell.
 
Yeah, mine is a 7.3 gas. No DEF system. It is definitely the LED headlamps making the noise.
 
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