i made some grille blocks for my tercel the other day...
at first, the opening under the tag was not there, until after the first drive, the car kept getting over 200* & kicking the fan on, i thought the small gaps on the sides would be enough...so i slowly trimmed a hole under the tag until i notice the fan basically only really comes on in slow moving traffic...is that acceptable??
whats the rule of thumb?
if i had more material left over from the Caliber's undertray, i would have filled up the whole grille without the gaps on the sides
that reminds me, i forgot to get garden edging at Lowe's for a front air dam