Coolant leak

There are two preformed line that runto the block and compressor.it is no doubt one of them,I have done many of them,there fun to say the least.

 

If you're an owner opp,with time.high idle engine at 1500,look at the front of the compressor by block and the fro t of the compressor.it is again a pain to see but if you're able to do it,it evolve's draining half of your coolant out and a flat head screw driver.freight liner gets the two hoses mixed up however wich all ways irritates me when I have to tell you guys that when I'm working on your trucks.its a 30min to an hour job for the hose and the hoses just has one snap ring on each end.hope this helps,if all else fails,I'm in az,good luck.

 

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look for compressor coolant lines one of them has a hole replace both being that they always go bad just need to drain coolant the rest of it is really easy