Hello all, I have just got a 1989 Chevy Blazer and I wanted to introduce myself and ask a few questions from people that know. 1. I have hub cover failure and wanted to know what could have caused it? Is it just fatigue or could something have hit it from the inside. I've removed this cover, but nothing seems to be amiss. 2. The previous owner removed the oil cooler and plugged the lines with what appears to be 5/16" bolts. There are no leaks, however I'm a stickler for detail and wanted to fix this. What's the easiest way--aftermarket or junkyard for a new cooler? When I do replace the cooler where can I find lines that fit? Are the lines that exit above the oil filter NPT? 3. The truck runs rich, but I'm not sure why. I can't find an oxygen sensor so I assume that it doesn't have one. If this is so, can the throttle body be adjusted or could it be a more sinister problem such as a vacuum leak? I'm very inexperienced at working on my own vehicles, but would love to learn how to fix this truck myself. I appreciate any help you could provide. Thanks!