I checked the fuses replaced the relay. The fan is not coming on after i did the swap its a d15b bottom end with a z6 head. I put coolant in the system started the car up and now the fan isnt kicking on. I plugged my d16y8 ecu in instead of my p28 would that have something to do with it? Should i just switch back to the p28? Its a 97 honda hatch dx.

There there a ground on the body that controls this somewhere?

 

i would run a a wire to turn on and off ur fan inside ur car, if u cant figure out what the prob is.

 

How do i wire a fan switch.

 

bump someone has to know.

 

get a switch then run a power wire and a ground wire then one to the fan. that should work.

 

The fastest thing to diagnose the problem would be just jump the fan switch. That more than likely the problem since you changed it when you swapped heads. Just take a paper clip or a piece of wire and stick it in the plug to jump the pin. If the fan kicks on theres your problem. Instead of rigging the fan. do it the right way.

 

well thats to check if the fan is working. But before you do that you need to run a test to see if power is going to your fan. Take a paper clip and unplug your fan plug sensor (the brown one) then take the paper clip and stick it into the fan sensor plug for both pin ends so that it loops itself. Then go to your car and turn the key on the on position. Does it spin? If not then it may just be your fan not working. Which means you can do the first test of sending power straight to the battery. But before you do that, check the interior fuse underneath your steering wheel. I believe its the heater relay fuse or something like that. Make sure its not popped and then check every other fuse down there to see that they are all good..

 

That fuse was good i was looking for the brown connector on the fan but i dont have anything like that . I have one connector on my car and it plugs in the fan to the harness its grey.

 

Bleed the cooling system and, if that doesn't work, check whether the fan runs with the 2P connector to the fan switch jumped.

 

how do i jump the fan i dont see the brown connector that the other guy is talking about? is this fan sensor located on the head?

 

Thermostat housing

 

well i unplugged the plug on the thermostat housing and stuck both ends of the paper clip in the plug turned the key on position like you said and nothing i even tried starting it with the paper clip still in . I dont get it this fan worked before i put this swap it.

 

Is either 20A hood fuse 57 or 7.5A dash fuse 17 blown? Replace each with a known good fuse.

 

both are good Oh and with the dizzy theard i had a couple days ago my dizzy was bad went and bought one and that problem is now fixed. Maybe something shorted out of my electrical components? The fuses are good i checked both of them last night.

 

Did you replace them?

 

yes i did replace them i even redid the wiring for the black wire with the red stripe for the fan still nothing.

 

Remove the radiator fan relay from the hood fuse box. In the receptacle for the removed relay in the hood fuse box, jump terminal 1 to terminal 2 (see lower diagram for reference). Does the fan now run?

Do you have a digital multimeter?