This is my first post on these forums and If it is in the wrong spot please feel free to move it or let me know and I will edit/move it.

I have an 05 Pontiac Grand Am 3.4 that is overheating sporadically ever since my wife drove it through a deep puddle. Basically after the incident the radiator started steaming and it dumped all of the coolant through the overflow. I filled it up and we drove it for about 4-5 days with no repeat then it purged all the coolant and overheated. I am not really a car guy but after reading on line I figured it was either the water pump or the thermostat so I changed them both out and replaced the hoses. While flushing the radiator it again purged all the water and cleaner. So at this point I really don't have any idea and would appreciate any suggestions.

I forgot to mention that the heater is only blowing cold.

-Thanks

JB