My swap is all finished and i got the exhaust put on today. Everything runs great. The only problem i have is my radiator fan will not come on, causing it to overheat. I tested the fan and it turns on with just power and ground. I checked all fuses and even replaced the relay. When checking both helms manuals i noticed that the H22 has 2 Coolant sensors when the civic only has one. It also has a radiator fan control module that sits under the dash. What do i need to do to get the fan working?

 

Make sure your thermostat isn't stuck closed. I had that happen to a new B20 that I threw in before my H22, so to quickly remedy the problem, I took the stuck thermostat out and ran a wire from the positive wire on the fan to the fuse panel underneath the dash, and connected it to the ACC switch (similar to cigarette lighter switch). I never got around to replacing the thermostat and when I threw my H22 in, the radiator fan still operates the same way - when the car is ON, the fan is also on until I take the key out. Never had any problems with my H22 overheating or anything else from the constant fan on (from both H22 and turbo B20 for well over a year now).

That's one option that you can do if you cannot figure out your problem.