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Question: my car is over heating and i dont understand why

I bought this car used a couple of months ago and then it started having trouble starting and I found out it was the alternator so I got a new alternator and a new battery. After that it worked fine for a couple of days until it started having trouble only in the mornings...then soon after the car started overheating so I got a new water pump and timing belt. then as soon as those got changed the head gaskets blew soo I had to replace those and now the car is saying its overheating as soon as I turn it on or shortly after I turn it on. I was told it had something to do the the secondary air intake hose but I was wondering if you all could tell me anymore.