2003 Honda Civic Sons Keeps Overheating Transmission Blowing Oil Out Vent Shop

2003 HONDA CIVIC
150,000 MILES
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My sons Honda keeps overheating and I don't know why. his transmission is blowing oil out the vent and the transmission shop says the oil is getting too hot and causing the tranny to pressure up. We have a mechanic pressure up the system twice and it holds pressure. We also replaced the radiator cap (just in case that was the problem). We can't see any water leaks but he has to keep adding water but I suppose that might be because of evaporation when it gets hot. There is no white smoke exiting the tail pipe. It has coolant in it. I just can't figure out what is causing it to overheat. What else should we check as a probable cause?
Mar 15, 2013 at 9:07 PM
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ASEMASTER6371
  • ASE Certified Mechanic
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  • ASE Certified Mechanic
bad thermostat, clogged radiator, or blown head gasket from constant overheating. have a leak down test done to confirm head gasket

Roy
Mar 15, 2013 at 10:26 PM
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