I have twin electric cooling fans on my XJ6 in place of the stock setup. For the 2nd time in a year, a Hayden 3647 fan controller has gone bad. It's not the relay, it's the switch itself each time. They are covered under warranty, but still a pita to take the time to swap out.

Can anyone recommend a controller they've had luck with? The Hayden controller has a radiator probe and also is wired into the fan clutch so the fans come on anytime I use the a/c. Is there a controller that would wire into the thermostatic switch in the radiator and also the fan clutch? I'd also be interested in a setup that would keep the fans running after shut off until reaching the desired temp.

Thanks for any input.

 

I've used this with great success.
Flex-a-lite Variable Speed Controllers 31165 - Free Shipping on Orders Over $99 at Summit Racing

In the depths of the interwebs...search for "taurus fan setup using volvo controller" and you will get one many link like the one below. There are many interpretations of this low budget solution

Budget Dual Fan Controller Setup / Taurus Fan Setup - NastyZ28.com

 

I used the 2sp model from here: Relay Controllers and Accessories

on our XJS to control the Lincoln MKIII 2 speed fan I mounted. Been going a few years without problems, initially I did try using a maxi-fuse on the power supply to it, and it worked but the amount of current going through it melted the plastic holder. I went to a metal circuit breaker with screw terminals and have no complaints.

Ron