Anybody running one of the MarkVIII or the Taurus 2 speed fans? The hot rod guys and the Jeep guys have been all over these things for years now. I have the Taurus fan and as soon as I can figure out the best way to wire it up it's going in. Hopefully it will fix my heat issue.

What is this heat issue?
When does it heat up? While cruising around stoplight to stoplight or at highway speeds?
Friends have tried that Taurus fan deal on their first gens and have went back to factory clutch fan

It's fine as long as it's moving. It actually ok when idling around too but when the outside temps were in the 100+ range and I was stuck in stop and go that's when things went all bad. Seems like the issue could be solved by evacuating all the hot air from the engine compartment. I think if I can force enough air under the hood to blow the overheated air out it might just do the trick. Hence the high speed fan.

I have used them a couple of times. They move A LOT of air. My biggest issue has always been finding a controller that will last.

I had a Taurus fan on my S10 for 4 or 5 years. I had to replace whatever controller I was using at least once and the relays a couple times. That was a Daily driver and saw A LOT of use.

I have a 65 Mustang that the Taurus fan wouldn't quite work on (too deep and hit the water pump), but a Ford Contour dual fan was an exact fit (I cut my core support and installed a 24" radiator from a 69 Mustang), Summit even has new ones in stock for cheap. https://www.summitracing.com/parts/rnb-620-104

NOTHING could keep this [censored] car cool in the summer with the A/C on in traffic until I installed this set up.

I haven't checked for fitment yet, but I'd like to try to run this set up on my firebird.

Couple things to note. You need an alternator can put out 80--90 Amps at idle. Upgraded 3 wire alternators are better than a "one wire". Most one wires charge based on RPM. Most 3 wires have a sensing wire that kicks up the amperage when it senses a voltage drop. The stock 60 amp Alternator on my Mustang COULD NOT keep the car charging when the fans were on high.

You need to install a GOOD controller. I've tried multiple brands, but the only one I've found that actually works is by autocoolguy. They're expensive as hell, but so far, it's lasted the longest of any I've ever used (3+ years). It has a soft start which is important on the Ford fans as they draw a lot of amperage. It has an A/C switch which kicks the fans on high when the A/C is on, and you can install an override switch, so if something does fail, the fans will run on high until you can get home and fix the issue.

http://www.autocoolguy.com/home

Also, make sure you're car is tuned to the hilt, timing, carb settings, even plug gap all affect how hot an engine will run.

I bought a couple of relays. One a 30/40a for the low speed and an 80a for the high. Then I read a blog of someone that was using this fan with the Volvo controller and a Holley EFI unit which exactly my setup so I went to the wrecking yard and snagged one of those. Haven't had a chance to put my rad and fan back in the car yet. Maybe tomorrow. Then have to wire it. Should have it finished by the weekend.