Coolant leak from back of engine 02 5.3

[tailgunn]

Have a leak from the back of the motor that is getting worse. I collected some of it today and it's anti-freeze. I was thinking it was from near the front of the engine but parked it in the driveway and the puddle is near the back. I do have to add coolant; maybe went through a gallon over the last 12/18 months. It also does use oil, maybe a quart over 3000 miles. I thought it was also leaking oil but this coolant did not appear to have any oil with it. It's an 02 with 240K on it and I've had it for about 4 years. I've never really worked on an LS motor so advice would be great.

[sefiroxx]

The engine leans back a bit so the coolant could be coming down anywhere and then run backwards to the lowest point.

[tailgunn]

i guess I'll have to clean the engine up and figure out where it's coming from...

[CamGTP]

The cylinder heads have freeze plugs, they can rot out and causing a coolant leak from the back side of the engine.

 

I'd use a mirror to inspect the back of the heads.