I've searched and I cant find a clear answer. My fan won't come on and its causing my car to overheat at a stand still. I'm not sure what plugs to jump or how the fan is supposed to react. I've tried the plug on the thermostat housing and the one under the dizzy but the fan doesn't come on. I've ran direct power to the fan and it comes on.92 si.

 

Try checking your Fuse under the hood... also check to make sure the fan ain't broke.

 

Fuse is good and what exactly do you mean by check to see if it isn't broke? I ran direct power from the battery to it and it turned on.

 

Did you check both fuses? Check the relay? If you're HVAC controls work, then your 7.5A fuse under the dash for radiator fan relay control is ok. I assume you mean the 15A under hood cooling fan fuse is ok, then check to make sure the relay is ok. If the relay is ok, check the coolant temp switch circuit to make sure it's ok (check for power to switch & ground from switch, with car on). Coolant temp switch is the one on the thermostat housing. When you jumped the switch was the car on? It needs to be. If that side (control side) is ok, then check for power to the fan with the switch jumped & car on (should have power). No power= open/brake in wire.

 

you know it works so its either the radiator fan switch, the fan relay/fuse, or a bad wire or ground. its probably the fan switch though i believe. replace it every 60,000 miles so you never have this issue.

 

Oops... Posted that in the wrong forum... lol.

I did the jump with the car off. Does the car need to be running or just have the key set to ON? The relay is good. I switched it with the heater one (which I know was working because my heater was on, turned off when I pulled the relay for it out, then started back up when I put the radiator fan relay in its spot.)

I'll test for the power next.

 

Getting power, so that's not it. What I don't understand is how jumping the wiring harness would tell you if Tue switch is bad. When you jump it, is it supposed to still be plugged in or do I need to probe through the back?

 

the switch connects the wires (jumps them) when the coolant gets to a certain temp (its a thermo switch) so a heat sensor (metal plate) causes a spring inside to alter its shape and allow electric current to flow through the two wires. very simple. you can think about this for hours or spend 20 bucks and 20 minutes and fix it

 

sounds like a wire is grounded out on something. check your wiring.

 

I'm thinking this might be the problem... When I did my motor swap, I ripped the wire that runs directly to the fan. I connected it to another ground, put them both in a connector thing and then screwed that into the thermostat housing. I was thinking maybe that came loose or didn't work to begin with... Idk, but I really need to fix my fan. If working with that ground thing doesn't work, I'm just gonna run a switch for it.

 

good idea. thats what i did

 

if you jump the brown connector on the T-stat with a paper clip the key needs to be in the on position for the fan to run, if it doesn't turn on its either the wiring or the relay if the fan works connected directly to the battery. If the fan turns on with the brown connector jumped its the switch

sorry if this has been posted didn't read everyones replies

 

Is that the only switch that controls the fan and is it the same on all Honda's?

 

i don't know about all of them but pretty much every newer 92+ d,b,h,f series engine has the fan switch on the t-stat housing. i can't imagine why they would change the type of connector among various engines so i would suspect them to all be the same. don't know for sure though. and it is the only switch that controls the fan.

just jump the connector as described above to figure out if the switch is the problem or if it's with the wiring or relay.

 

I think I found the problem... I was tracing the black wire with the red stripe that plugs into the fan and I found a black wire with a red stripe that I tied to to a ground when I ripped it in half when I did my swap. Not sure if it's the same black/red wire, but I'm not sure where it's supposed to connect to get power. If I can't figure out where it's supposed to go, I'm just gonna put a regular switch to power it.