ya dave they are window defroster vents and i think yours are vented to fresh air <img src="/forums/images/graemlins/scared.gif" alt="" />

if it's not your heater core what else could it be? i'd replace the lines too while youre at it.

oh, and the truck is 8 years older than you, and 27 years old <img src="/forums/images/graemlins/wink.gif" alt="" /> dont teach math in london? <img src="/forums/images/graemlins/notooth.gif" alt="" />

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim