Unless the "problem" is very, very, VERY noticeable, that is a normal occurrence.
'Tis the way that they are built. The compressor shuts off and at times the vacuum reservoir will run out of capacity under extreme, heavy demand.
If you can feel the mode doors changing where the cold air actually changes to heat, there "could be" a drivability/engine tuning/plugged exhaust problem, but it is doubtful.
Been thru this argument many times with many customers on lots of different makes of vehicles; many, many of them less than a month old.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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