| Too many amps
Older AC's in fact do draw more amps than newer ones.
I would suspect that you are using too light of an extension cord.
The 30 amp lines are usually 8 or 10 guage. If you positively must have an extension cord, get at least an 8 guage. These are available at Mobile Home parts dealers.
Get the absolute minimum length that would be necessary for your proposed hookup.
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