I can't figure out why...........

[Johnny Outdoors]

IM SORRY TO SAY THAT WE HAVENT HAD A FAILURE THAT DIDNT TURN THE DYE BLUE EXCEPT ONE
WE HAD ONE CHRYSLER THAT BARELY CHANGED THE DYE
BUT YOU COULD HEAR THE BUBBLES IN THE HEATER CORE AS THE HEAT CAME AND WENT
WHEN WE CHANGED THE HEAD GASKETS (BECAUSE WE WERE AT OUT WITS END)WE FOUND A BAD GASKET A TINY SPLIT
JUST LUCKY I GUESS
WE ALSO HAD A CAR DO THIS BUT IT ENDED UP THAT THE IMPELLER ON THE WATERPUMP HAD ERODED AWAY IT WOULD OVERHEAT WHILE IDLEING
BUT I SEE YOU WERE WORKING ON THIS PROBLEM EARLIER
WE HAVE ALSO HAD TROUBLE WITH OLD DYE
PLACE IT NEAR THE TAIL PIPE AND IT HOULD TURN BLUE
THEN GO OUTSIDE AND SIPHON AIR THRU THE TESTER AND THE DYE SHOULD RETURN TO YELLOW
IF NOT START WITH FRESH DYE
CARQUEST UP HERE IN NY CARRIES IT PRETTY CHEAP WITH THE TESTER ALSO I BELIEVE
GOOD LUCK