My b16 is losing coolant. I just bought this car last week and the guy had the charge the battery and add coolant because it had been sitting due to no heat. Today my temp guage goes to 250 just idleing but the cars guage stays right in the middle. I start to drive it and the cars temp guage rises 3/4 and I immediately get it back home before it ran completely hot. Well what do you know its got low coolant.

The car seems to run perfect but what is causing it to lose all its coolant within a week. I only drove the car maybe 2-3 hours tops the whole time i've had it. Could it be a headgasket?? I checked the oil and its not milky the antifreeze is fresh. I can't see any leaks but I have'nt done a exstensive search.

Could this be why the heater blows cold?

Any suggestions? help?

Will a compression test tell me if its the headgasket?