Anyone using an electric cooling fan?

I'm talking about a simple Volvo dual relay fan controller from the mid 90's. These are pretty much bullet proof, and $10 at Pick-n-Pull.

Grounding yellow wire #1 gives low speed, grounding yellow wire #2 gives high speed. That function is being handled by a BMW Z3 dual temp switch that switches one contact at 195F and another at 210F. An alternate switch with 180F/195F switching points is available too.

The little rubber covered gizmo over to the left is a Short Stop 40A auto reset circuit breaker. The other side of the breaker connects directly to the battery with marine 10 gauge wire.

It's super simple and factory durable. To buy all of the parts new including the zip ties is less than $300 total.

You'll find the Volvo relays used all over ebay too, including the connectors.

Chris (Greyhounds_AMX), looks like you're using the factory resistor for the low speed. I like the idea of the self-resetting circuit breaker instead of a fuse. Marine is an even better idea since it's mounted low. I'm sure you know this, but there are self-resetting circuit breakers in the auto parts stores along with the fuses, just put them in a protected area.

Just to be clear, the yellow wires will be connected to the temp sensor, and that black wire with the round connector is ground, correct? I like your setup better than what I'm currently running... might change it if I have any issues. Yours is a much neater installation. I would just need to get a lower radiator hose mount for the sensor and do a little re-wiring.

I'm using a pair of adjustable controllers with probes inserted in the radiator. I push the probes in between the core fins. They come with a mount that sort of lays them against the back of the radiator with a small (1/16" or so) gap between radiator and probe. I found that to vary too much with weather, and stuck it in the core instead. I've seen them shrink wrapped to a radiator hose as well. Since they are adjustable mounting the probe is flexible. I think mine is a Flex-A-Lite as they were at a local parts store (and cost more!), but similar to these only just two connectors for the fan (click on only).

Cheap, and have held up since 2003 for me. At least one has, used it with Taurus fan, bought another in 2016 when I went to dual fans due to thicker radiator -- not enough clearance for the Taurus fan any more (http://theamcforum.com/forum/fsj-jeep-radiator-in-rambler_topic76414.html - pics of Taurus and aftermarket fans on AMC radiators). As I mentioned, just wired for high speed, staggered temps. One comes on ~190 (just as T-stat is starting to open), other ~200. I'm using a pair of 40A relays, was just using a single 40A with the Taurus fan. I have read that the Taurus fan pulls as much as an 80A surge when starting, but never had an issue with the 40A relay. I initially ran a used factory 30A, it finally failed after about 5 years use. It was pulled from the wreck I got my initial 4.0L from, a 88 Comanche with over 100K miles on it, so the relay was well used.