boss347convertible wrote:

That looks identical to my radiator fan set up. The thermostat and controller are identical, but I cannot tell if the fans are made by Spal. My setup has Spal fans and has been in use for at least 17 years. The fans are loud and start and run simultaneously, resulting in a high amp start up and the fans draw a lot of running amps. I am told the new Spal brushless fans have a soft start feature. 

I don't like the temperature probe as it passes through the radiator fins between the tubes. I am going to weld two bungs into the radiator and run two thermostats at different temperatures to mitigate the high start up load and fan noise.

For reference, I used a four row champion radiator for 14 years that developed a pinhole leak (free to a good home). I then installed a Champion three row radiator that does the job; however, my seat of the pants tells me that the fans are running for a longer period of time with the three row radiator.

I took power from the starter (trunk mounted battery), so when hot, my fans would run with the key off. If I restart the car with a hot radiator the fans will run, sometimes making starting difficult. The relays switch off of ground from the thermostat, so I wired a switch to interrupt the thermostat ground to the relay.

For other cars, I have had success treasure hunting at independent Volvo, Ford, Chevy, etc. repair shops. The modern cars have modules that frequently fail, and on many, the modules are not sold independently, leaving a perfectly good shroud, fans and wiring, often with fuses. Sometimes I get them free or pay about $50 for a unit.  Almost all of the units use Spal fans and I have found these oem units to be quieter than my set up. The factory connectors matched the connectors available from Spal-no splicing wires. 
Good luck.
 

I found that Autocoolguy makes one of the best fan contolers out there. Has no prob or relays and  releys on the out going side of the radiator for temp con