Need some ideas on what may be causing and antifreeze leak
I have had my car into two different shops and they can see the leak from the bottom but can't find it so I am know turning to everyone here for some ideas that may help me find it and fix it before winter sets in. So the leak only happens when the car it running and it is leaking by the passenger side part of the frame rail. Both shop I had it at said it wasn't leaking from the water pump of the hoses along with the overflow reservoir. I replaced all of that stuff I mentioned when I went to flush out the Dex-Cool and change it over to a 50/50 system. Also I have had it just at an ideal to find the leak and never could but I could see antifreeze on the frame rail on the passenger side so I an know coming back to everyone for some ideas on what it may be so I can fix it. It seams like the leak is either coming from behind the harmonic balancer or a little bit higher up right around the belt tensioner setup but not really for sure. I have had a a few friends say it may be a freeze plug behind the timing cover but accordantly to GM a 3.1 V6 don't have them behind the timing cover, they just have the gasket setup and they thing it may be a bad gasket but not really for sure. So what does everyone think if may be. I am open to any and all ideas. Also it leaks about a half of a gallon of antifreeze a month so I always keep a jug in my trunk.
1996 Oldsmobile Achieva SL
White 4 Door