frozen pipe- I'm gonna whine here!
Your probably not too bad off in this one. "IF" you can get ridgid foam panels slid 'behind' the pipes next to the cold wall ,,,helps a ton. You say wind coming out of wall hole,,is that cold drop like a window has??OR actual wind blowing thru cracks of unknown origin in THAT cavity?? Use an extra second and check outside in THAT area for possible places to shore up caulking(Read stop the wind blowing thru)
AND when your all done with THAT cavity and keep the pipes from friizin,,,remember the whole REST of the wall that is PROBABLY just like that,sucking your heating dollars out the window,,so to speak. So in the larger scope of things,,,can you insulate the WHOLE wall better?? Blown or foamed?? Paying CLOSE attention to under edge of siding,,,and where sill and rim joist meets block or concrete foundation??? Siding seams?? under eave seams?? Just rambling thoughts here!! -d-