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If you are losing it blowing out of vents then it is losing vacuum and going to defrost. this would be caused by a broken vacuum line to the vacuum resevoir
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It is almost certainly due the drop in manifold vacuum when climbing hills or accelerating. Back in my youth windshield wipers stopped when you stepped on the gas.
u have a loss of vacuum to the ac mode control switch, this switch applies vacuum to diff vacuum motors to move air to diff outlets, dash, floor, defrost etc. either the vacuum line or vacuum resivior at the engine is leaking or the mode control is leaking vacuum.
Sounds like throttle A/C cutoff. Check at what point A/C stops. Full throttle, 3/4, half, etc,... You can disable the throttle A/C cutoff. This is designed for increased performance. Check manual for your cars setup.
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