Replacing Air compressor Lines

Ok Im trying to replace 3 lines on my air compressor(Ill post pictures in a few minutes). Im able to get the fittings on the front side off on 2 of them, do I need to remove the compressor to get the ones on the back side off? (If so, Ill just take it to a shop). Ill post pictures with description....

 

Also, how much coolant is gonna run out of here. I got it loose and coolant started to pour out so I tightened it back up. I can’t get the other side off, well I’m trying to figure out how to do it

 

I’m also gonna replace this line I think it’s a coolant line because it’s leaking near the middle of the line.

 

I looked at youtube and the guy on there used a "crows foot" wrench to get the one with the oil in it off.(1st picture the bottom line on the compressor). I had no idea it was expensive for a hydraulic line....I don't know the exact price but I was told it was a few hundred dollars....Ive never had to replace one in 20 years!

 

@Rideandrepair

Yes Im gonna take them off tomorrow. I know 2 of them I can get off I just need to get that crows foot/feet wrench. I went to buy it today and took place closed early.

Drain the coolant from where? I mean where do I drain it from?