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My sons car started overheating so i noticed the waterpump leaking which I replaced. Now the radiator fan isnt coming on. I also changed the t-stat. Here is the part I cant figure out. When I test the new temp switch at T-stat housing and I have my test light grounded and probe the green wire the test light comes on and so does the fan? I am not sure whats next. Any help would greatly appreciated.

 
Rep Power: 255

Im just taking a guess here, but maybe it could be a bad ground?

 
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when did you replace the water pump and t-stat? you might just have air in the system.

 
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I bled the system again and it now works like a charm. Thanks for your help. I guess it still had some air in the system.

 
Rep Power: 255

good to hear, next time when you fill up your radiator fill it with the nose up works like a charm everytime.

 
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some of the older civics have bleeders also...crack em open and pour in the coolant till it comes out the bleeder. close bleeder, no air.