Honda Repair: K-series engines, stock radiator, pattern answer


Question
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Followup To
Question -
I have an 03 Civic Si with a K24A2 engine swap, turbo'd, built/ sleeved.  When it is cold outside, and the cooling system has been bled out recently, it runs at 180-195 degrees all day.  If it's hot, it goes up and down.  Then, after about two weeks of driving, it decides to overheat a little, and runs up into the 220 to 230 range.  I realize the iron sleeves could raise temps, but it almost always runs around 180 degrees.  If the problem is ignored, it gets worse until you can't drive the car without overheating. I had it looked at, and he said he tried bleeding the cooling system and it seemed to help, for about two weeks, and it's following the same pattern.
Answer -
Is it using coolant?  I don't think that bleeding the system would do anything unless the level is going down.  Are you still running the stock radiator?  You may want to look into upgrading the radiator first and then possibly the fans because it apears that you can't keep it cool enough in hot temp. Do you still have the A/C on this car?  If you do, don't run it and see what happens.  

The coolant appears full, but he claimed it took an additional quart last time. Koyo radiator, mugen thermostat.  Rarely run the AC, but it makes it better if I do. The strange part is that it runs perfectly at 180 some days, and some not.  You think the FAL fans would really help?  Should I have them both on all the time, or on temp. swithes?

Answer
Well both fans come on with the A/C so that may be why it cools down when you turn the A/C on.  Do the fans come on by themselves if you let the engine idle?  What about something crazy like adding a secondary fan on the outside of the condensor blowing through the radiator/condensor if there is room which you could add a switch to power if you needed it.  This way you wouldn't have to mess with the factory wiring.  Do you have a intercooler in front of the condensor as well? If you do, there may not be enough air flow to keep it cool enough so a secondary fan may not be a bad idea.  If there isn't room, maybe add a switch to one of the fans or wire one to run all the time.