Installed an e fan on my Dakota today. The fan does not come on at all and the truck overheats. I have the thermostat tapped into the cooling system and ignition wired to the stereo. What's going on?

 

Year/Engine?

Can you post a schematic of your wiring?

Is there a relay in there somewhere?

 

Yes there is a relay and here is the diagram

 

Try hooking up power directly to the fan, to see if works.

 

Is the fan grounded?

 

It works with direct power

 

I see the problem and it may not be one you can easily fix. the thermostat threads need to be grounded to activate the relay coil to pass current. Depending on where you have it threaded into, it may not be grounded. It's a rather cheap/chinsey setup. You get what you pay for.

 

Ok waiting for my truck to heat up now and I'll try it

 

Well that was the problem. Thank you so much! I've been stressing for hours lol can't believe it was something so simple

 

So now that the t stat is grounded there is another issue. The fan is constantly running and won't shut off. It starts as soon as the key is on