I am just wondering how the heck I can tell if my 98 Blazer LT has option zn4 or not. I need a new a/c compressor and apparently it makes quite a difference.

 

Glovebox. There's a sticker in there, should look something like this.

 

What is zn4? Auto climate control or something along those lines?

 

I think ZN4 means it is VIN'd for a different year than what it's actually built in.

 

98 Blazer with a 4.3L uses the Harrison, (guaranteed to leak at the seam) HT6 compressor. Doesn't matter which HVAC system you have, HT6 is the compressor that was used.

 

Thanx man. . .should've known that but its been a long day.