Stupid Cold Weather

[Project96svt]

Just asking for opinions but there was a cold front that came through a couple weeks ago and I relized that my cobra had all water in the cooling system
well after checking it over( and waiting till it defrosted) I started it up to find a small leak down below the headers, not exactly sure where. Do you think its a freeze plug, or what ive heard it could also be a cracked block. PLZ let me know what you think.

 

[goldbomb79]

Hope and pray it's just a freeze plug, but I've never replaced a freeze plug on a 4.6. I'm guessing it's not very accessible without pulling the motor though. I could be wrong. How cold did it get there?

 

[Project96svt]

It got down to zero the whole city shut down but it was fine before then so I hope its a freeze plug

 

[CJK440]

I'd pressurize the cooling system when its cold using a pump. I take off the small hose that goes to the de-gas bottle, cap the fitting and pump like 15 psi into the small hose using a cooling system test pump (maybe autozone rents them or fab something yourself).

Jack the car up and climb underneath and see whats what.