I have a 94 ex with a jdm d15b swap in it. A couple weeks ago, i was driving through town and stopped. when i stopped the overflow tank was boiling but the engine temp was normal. i let it cool, put more coolant in it cause radiator was dry, then later let the car sit at idle and run and it didnt overheat at all and was good for a lil over a week. then i was on interstate going about 80 the whole way for 50 miles, and when i got off, it was boiling again and then engine temp was still at normal temp! i found out the switch that turns the fan on wasnt working properly so i fixed it and havent been on a long trip again yet, but does anyone have a clue as to what this problem is? there are no leaks or weird smells or anything. it jus randomly started happening. any help/suggestions would help, thanks.

 

Sounds like the mixture for the coolent has too much water

 

i hope so. i didnt even think about that. lmao. the last time it overheated i put 50/50 in it and aint had a problem since. the other time, i used jus straight water. lol

 

Yea you might want to do drain/refill and get 50/50 in there

 

it was just ur fan than... once u fix ur fan it stopped overheating right??? try this unplug ur fan and drive till ur car overheat or 20min or so... than let the car cool plug ur fan in and drive for 20min or so and see if ur car overheats

 

well i also haven't taken it on a long trip either. so it kinda hard to tell right now. but the water thing makes sense. i accidentally loosened a drain plug for the block a few weeks ago cause i wasnt sure what it went too cause it didnt look like a drain plug to me! LMAO. Terrible idea! so i retightened it and then put water back in it where i had lost coolant. then it overheated, then i put even more water in it, then it overheated again and i put 50/50 in it instead. i jus didnt think about the too much water thing for some reason. lol

 

Well drove it again today another 100 mile trip and all good now. thanks for the help. now that it fixed, import alliance here i come

 

ive got a 94 civic ex and cracked some plastic peice hanging off the bottom drove the rest of the way 2 the job it began 2 over heat repaird the crack filled up radiator and resivior and it still overheats ne help?