Quick question about antifreeze/cold nights...

If it does freeze your gonna have leaks but im in the same situation and havent had a problem yet. If the mixture is slushy when you look at it I wouldnt start the car but if its just cold and its still a liquid your fine. Bad things can happen if a line is frozen and you start it though.

If the temp is going 5-10*F lower than your checker thing shows, -5, then you can run into some problems. If the coolant freeze , it could breake your radiator or waterpump. Frozen water expand a lot, and is strong enough to crack metall,weakest materials first,aluminium,brass,etc. If it only slush,there will normally bee no problems. Never try to run your engine with slush or ice in the cooling system. Tow your car to a garage or somthing for a slow heat up period. If you cant do this, wait for warmer weather. You can drain a Quarts or two from your radiator, and just add antifreez (run the engine after adding.. ) .This lowers the slush temp... The coolant will start to slush very slowly,from the -5 range. How cold could it bee around your frozen Horse ? Good Luck.

The only real problem will be if it freezes solid and does damage to your waterpump/block or pops out the freeze plugs in your block. You will PROBABLY be OK, but next year make damn sure you have a better mixture in there.

Yes, it will begin the thaw at -4. But... it will thaw very slowly. Your antifreeze water mixture is just like water, it just has a lower freeze point. Just do like -86GTStang said and drain a couple of quarts of fluid and add a little antifreeze. That will lower your freeze temperature way down.