Acura Repair Questions? Ask a Mechanic for Answers ASAP
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Considering what has been done it sounds like you have a head gasket problem as there isn't anything else that would cause overheating. Next step is to have a combustion test done which will check for exhaust gas in coolant and a pressure test to see if cooling system holds pressure. If it fails either test then you know the head gasket is leaking which is about a $1000 to have replaced at a shop. Let me know if you have more questions or if there is anything else I can do to help. Thanks.
The common problem to cause overheating is the radiator fan switch which prevents fan from turning on. The head gasket failure is not common on this engine but since you have already had everything else checked out that leaves head gaskets as last possible option. Let me know if you have more questions, thanks.