If you have had any parts replaced on your cars cooling system (radiator, waterpump, new hoses, ect) then there is a chance that your cooling system has air trapped in it and this could make your cars cooling system operate poorly, or in worst cases minic the symptoms of a cracked head.
So BEFORE you spend thousands of dollars at the mechanics having this done, try this and see if your cooling system operates normal (temp stays within normal , does not get hot or overheat).
Step 1: Things you will need
Spill free funnel ($20.00 on Amazon.com)
Rag to wipe area clean
Time and Patience
Open your radiator cap, insert the angled peice of the spill free funnel into the correct cap for you car, then the main peice of the funnel on that, Make sure that you have all conections on sung so that there are no leaks.
YOUR CAR SHOULD BE OFF, DO NOT START YOU CAR YET!!
NOW you can start you car.