RPN for Left/Right Intercooler Bypass Valve ?
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The speed at which you might be able to increment/decrement that variable would be up to the hardware binding software that you're using, but this very simple code will just increment/decrement the variable every time the code is run.
(L:XMLVAR_Cabin_Heat_1_Position, number) ++ 100 min (>L:XMLVAR_Cabin_Heat_1_Position, number)
(L:XMLVAR_Cabin_Heat_1_Position, number) -- 0 max (>L:XMLVAR_Cabin_Heat_1_Position, number)