Westernstar losing air?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Perchie15, Jun 19, 2024.

  1. Perchie15

    Perchie15 Light Load Member

    Aug 16, 2021
    Westernstar with DD16 engine. We thought it was the trailer but now with body job the guy in the tank truck builds air fine from first of the day but if it’s sitting at 1000rpm it’ll eventually lose air from 120 to 70psi over time like 15mins. The purge valve under the dryer does not stick open when it purges at 120. But while he’s driving it doesn’t lose anything. Which then he’s running at 1450rpm! I did change out the governor thinking it was it but still same issue! I’m leaning to compressor anyone else have ideas.
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