the cardboard doesnt affect the temp when its sittin still so sitting in traffic will not hurt anything. when your sitting still you dont have air flow through the rad so blocking off half of nothing is nothing. lol. so this is only for the purpose of blockin it off so you can gain temperature when going down the road.
-justin
toddluck
+1y
i bought a new stat and it lasted a week...replaced it again and have had no problems
pull your t stat and drop it in boiling water see if it is opening then take it out and see if itcloses all the way ...also make sure the giggly thing is in the 12 o'clock position