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I'm sure this is an ancient topic,,,,but I've searched and cant find anything. Just bought a '91 Explorer. Is it OBD compliant???? Or am I going to have to learn to manually get the codes??

Depends on whats shot in the compressor. With your AC off. Start your truck and turn the defrost on and listen to the compressor. You should hear the clutch kicking in and out. If it doesn`t,,,chances are your compressor is shot.

It's common in every vehicle for the engine temp to go up with the AC running. It's just that much more of a load on your engine running the compressor. Rather than just doing a manual rad flush at home with a garden hose,,,try taking it to a shop and having a power flush done. It might drop...

Check your U-joints. If you can repeat the noise with your head under the hood and raising the RPM by hand,,,then I'm wrong. But if the sound only happens when you are driving,,,check the driveline. Specifically if it happens at the same speed all the time,,,not just the same RPM. If you're...