Chevrolet Repair: coolant, coolant, c20

Question
my brother drives a 1986 c20 suburban and i have a 99 silverado do they use the same coolant

Answer
HI WESLEY,,NO.THE OLDER TRUCK WILL USE GREEN COOLANT..THE 99 WILL USE RED DEX-COOL..THE DEX COOL IS GOOD FOR 150,000 MILES OR 5 YEARS BEFORE FLUSHING. THE GREEN IS GOOD FOR 2 YEARS ONLY..
IF YOU USE THE DEX COOL IN THE OLDER TRUCK IT WILL WORK,BUT YOU WILL STILL NEED TO FLUSH EVERY 2 YEARS..UNLESS YOU BOIL THE BLOCK,RADIATOR AND REPLACE ALL THE HOSES..HOPE THIS HELPS YOU, AND GOOD LUCK..TOM..