Just (Thursday) did the quarterly PM's on both of the trucks, (yes I am that crazy and organized) Everything on the 05' was good, but then.......oh then....I found this right here on the EXT. I have no idea how I missed this before.
This is on the bottom of the radiator on the driver side, and although it is not leaking or causing problems it shall not stand. I have been looking for an excuse to upgrade mine to a 3 row aluminum radiator and here it is.
So to summarize "what I did to my GMT today"....Quarterly PM
check all fluid*
inspect tires and check air pressure * (including spare)
lower spare wheel
rotate tires
inspect brakes
inspect for leaks
check all lights *
inspect hoses
check for any excessive noise with stethoscope
check torque on drive shaft bolts
check torque on lug nuts *
clean battery terminals
service battery (N/A with AGM batt)
inspect wiper blades
clean throttle body
clean engine air Filter
replace cabin air Filter
check a/c pressure
inspect door hinges, lubricate as necessary
change oil/Filter as needed
scan for pending/stored service engine codes
grease suspension components as necessary
clean Inside of windows (safety Item)
* (also done on a weekly basis)
That's about it for a quarterly PM.........takes about 2 hours for each truck usually.