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It would help to know which model Kenworth you have. The cooling system pressure shouldn't be more than 15 psi. On later years of the T600, the T660, the T680, some models of the T800, and some models of the W900, the radiator has two caps.. the first is the fill cap, and the second has a bung, and that is the pressure relief cap. If the pressure relief cap is faulty, it usually fails to hold pressure, although it can fail to release pressure, particularly if there is blockage in the bung itself.

On Kenworth trucks which don't have this, the fill cap does double duty as the pressure relief cap.

I would check those first.

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Q: Why your kenworth building pressure on coolant?
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