GMC LEAK

I Was Checking My Unit For Coolant Leak. It Was Cold Had Not Been Started. I Pump Up Pressure With Cooling System Pressure Tester To 16...

So I Bought The Vehicle Listed Above From A Private Party And Was Told It Needed A Freeze Plug. Get It Home Put The Plug In Drive For 15...

Got A New Water Pump A Couple Days Ago. Yesterday It Said Low Coolant We Put It In, And It Came Right Back Out. Wondering If They Even Put...