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How long is your route?
Trucks have oversized cooling systems compared to cars with sand drivetrain. The HVAC heater can be on its own circuit (not a good gauge as to warmup). Tires and axles also longer to warm. Etc.
A grille block at 41F or lower would have been “good” (See operators manual).
Im simply suggesting that specification differences per design (it’s a truck and not a car) should be kept in mind, first.
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