I have a 1990 Crx and my radiator fan won't come on..if I give it direct power it will.
Does anyone have any ideas why?
Please help me out.

 

Start with checking 15A fuse in position 15 replace if blown
I bet your relay is good so move to Fan switch. locate it and remove plug and run a piece of wire between the two connectors. with key in On fan should run. Replace thermal switch if fan runs.

 

^its your thermal switch. wire passed until you can replace it

 

Its located on back of block if you are not swapped. Should look like this.
Honda CRX Coolant Temperature Sensor | Free Shipping | 1988 - 1991, Standard, Beck Arnley

 

ok thanks guys ill try that.
The car has been swaped any ideas where to look?

 

B swapped is on thermostat housing