Possum, Depending on the year, it might not have secondary air, if that's the case, it will never indicate OK Don't worry about A/C refrig monitor, guaranteed it doesn't have that one.

 

Captain, the Blazer is a 2000 4 door 4wd. Will I have to take it somewhere to clear the history? There aren't any codes in it. The SES/CEL is not on. I'm just trying to get them to show OK.

 

If all you need to do is complete the monitors, you don't need to clear the memories.

 

Great, thanks Captain.
Tuna, sorry for highjacking your thread.

 

No problem, Possum.
There's always a chance to learn something new in order to keep these problematic Blazers on the road. Captain always seems to have good info and and great tips to get the job done. Problem is; "It's always something...." with these creatures. I sometimes can't believe there are so many on them on the road.