d15 is over heating just at hiway speeds. driving around town stoplight to stoplight its fine. any ideas??

-spenc

 

Chek ur radiator cap. I had that prob too with ma EE9. My radiator cap was faulty. It released preshure before time. Wich would lead to all my coolant to flow into the overflow tank...and eventually out of it.

 

overflow tank was in check all day(i was at autocross and looking at it all day.) since it gets hot at speed, but not at low speed, it doesnt seem like a water issue. im thinking cloged cat?
-spenc

 

*update*
changed rad, still overheating. ran w/o cat, still overheating. going to try thermostat next

-spenc

 

do thermostat and flush and fill your radiator. redline makes a product called water wetter that is supposed to help with overheating. if none of this works than it's probably the water pump.

 

That water wetter stuff is good for short term applications, but from what I have read, its detrimental to your radiator when in use for long periods of time. hth

 

water pump is my guess

 

https://honda-tech.com/zerothread?id=510732

 

well, upon taking it appart for teh thermostat, we found that the previous person to work on the engine (not in my car) put the thermostat in backward. i installed the engine in november, so it wasnt warm enough for it to realy overheat. plus, the thermostat that was in tehre wasnt opening.
problem solved.
-spenc