Liquid soap, water, and a spray bottle. Spray every line and fitting. Whatever blows bubbles is the culprit.
If it's all 4 tires, it might be the solenoid under the hood too.
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1997.5 HMC4 Hummer H1 w/Slantback shell (Mine)
2006 Hummer H3 Adv. Package (Wife's)
M101A2 Trailer
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