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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
My 94 ram 1500 did that with the 5.2L was from a vav leak on one of the vac hose going to the ac controls. vac drops at hiway speed and it would swich to reg ac if I would let off the gas it would swich back to max ac after vac line was fixed worked great.