[mustangmustang]

The radiator fan on my 1989 2.3L is not 'kicking in.' I replaced the relay found by the steering column, under the dash- but still nothing. I tried a spare fan I had from a 1990 six cylinder to make sure that it wasn't a fan issue. Any suggestions? Thanks

[heavy metal]

May be the sending unit.

[NavySVO]

Have you jumpered the fan directly to the battery to see it it works there?
The sensor that will close the circuit could be pooped or have a bunch of buildup on it to where it won't work.

I went with a kit from SPAL (google it) that will work with the factory sensor or you can get one from them as well. I went with this as with the age of these cars and the crappy factory wiring has the potential to start an electrical fire.
I use the stock fan, and you can set up their controller under the hood. It has 2 settings where at your desired temp it will start the fan at half speed, and at the 2nd temp it will run the fan full speed. It's about $100.00. They also have fans as well.

[Lazypig]

The people that had my mustang before me just rigged some switch under the steering colum doesnt seem to kick in though. so i just wired it to the battery with a switch i turn on myself when it gets hot. fast easy fix kinda annoying having to turn it on every time though.

[VFAST]

you can get a relay from napa or other chain stores it's a generic one

[mustangmustang]

I replaced the relay- no effect. I then replaced the temp. sensor- eureka! Thanks for the tips!!!