Take the 2-minute tour ×  I have heard a few different ways to
fix a pin hole leak in a radiator. I have heard put a small
amount of black pepper in the radiator, or use jb weld to patch
the hole, and not to use the stop leak antifreeze.  Any
suggestions?  share|improve this question add comment  3 Answers
up vote 5 down vote accepted  If you are willing to drain the
coolant, most radiators can be brazed or welded to fix pinholes.
share|improve this answer does this include aluminum radiators?
–  BrettAdamsGA Jan 24 '12 at 16:27 Aluminum radiators can be
welded by someone who knows what's they're doing. –  Timo Geusch
Jan 25 '12 at 0:28 add comment  If I didn't really care if I
might hurt the car, I might be willing to try JB Weld...
share|improve this answer Seconded. At worst you'll ruin an
already-dead radiator, not any other part of the car. I've had
luck with this method in the past, although it was a giant
gaping hole and I added some radiator stop-leak too after using
the JB weld. –  R.. Jan 25 '12