Quote:
Originally posted by BlackWolf
Mine does this too. Only problem is that I can get the ac fan on but not the regular fan and now it overheats when I turn the air on. I've already replaced two relays at about $100 and I can get the fan to work if I hook it up directly to the battery so it's not the fan. It's still somewhere in the electrical.  I HATE electrical problems. I might just hook it up to a switch and be done with it. I really don't want to spend anymore $$ on it. Any other ideas?
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Replace your coolant temperature sensor.... it should be the one in the thermostat housing...
It's old and not responding to the heat range it should anymore...
Get a new one and it will come on fine... the easiest way to be sure that's it is to unplug the plug from the sensor and jump the connection (if it's a 2 wire)... it should make the fan come on...
If not your problem is something else...
VW's and a lot of other cars do this as well... it's a good idea... Civic's only come on after the car is off if the power is still on... the fan won't come on w/o acc. power.
If the fan can come on with the power turned off.... there should be a warning lable under the hood somewhere... generally right up front on the radiator support.