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Coolant levels irratic - Help!! 700 89

My 740T overheated due to a leaking radiator. We replaced the rad and since then have had varying levels of coolant in the overflow tank. I will add coolant and it may stabilize or afetr driving,it could fill the tank. Today, driving on the freeway, the gauge pegged and then returned to normal. We checked and the tank was empty. When the tank was opend, the pressure expended everything. The tank required a lot of water to fill and when we returned home, the tank level was higher and rose as the car set. What is wrong?

I have considered warped head, head gasket etc. Could it be a bad radiator? water pump??






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