GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hi, my name is ***** ***** you have the heads resurfaced, before reinstalling them?
ok, but they should always be resurfaced so the new gasket will seal, have you had a black test done on this yet?
A block test checks for exhaust gases in the cooling system, it consist of a tube that pour a blue fluid in, then run the vehicle and draws air from the radiator, if the fluid turns green, then it has exhaust gaes in, indicating a head gasket or a cracked heqad or block,Tim