Otherwise the fan comes on a bit later but then has to run at a higher duty cycle (sudden high-fan instead of early-low-fan). I highly recommend this for fan-deleters. While it works anyway without this, it is MUCH better since I loaded Terraphantms tune tweaks that adjust trigger points. This means your tune can be tweaked to trigger it at different points. If you're talking about facelift motors, the Aux fan is driven by PWM by the DME.NOT for 'engine protection' by the way, but just purely for 'stranding inconvenience' purposes. that was my original plan and I have a fan controller and everything on the shelf.) Indeed at that point just personally I probably would want the redundancy just in case. Mech and/or electric, one way or another (prob I'd go 2 electric. If I DID live in a superhot AC-year-round and 100's-all-the-time-in-summer place, NO I would probably not do this, YES I would probably keep 2 fans. Redundancy is NOT an absolute requirement, and the Aux fan quality and durability is amazingly high. Only a zillion OEM cars are running around with single electric fans these days. Those same exact fan constructions are used for cars with only an electric fan. "Fan was not made to run this MUCH!" is BS.In the facelift type DME's, the DME shuts the fan off when you hit that speed in fact. Which is important, but lotta the haters are unaware of this fact. The fan is only there for when you slow down or sit. I don't care if its 110F and the AC is set to "make ice", the fan is not doing a thing. Realize that NO FAN IN THE WORLD does anything after 30-40mph roadspeed.It is 100% totally fine, mainly if you live in moderate / 4-season type climates.Here's my bottom line take on the whole deal: THAT then caused me to start to go into the redzone whe I slowed down into stop and go traffic, and have to pull over, and figure out WTF why was I overheating in a blizzard. Once (maybe twice?) slush has frozen up on the front of the car in freaky winter storm conditions, and caused the Aux fan to freeze up while driving at highway speeds (fan doesn't run over 30-40 mph so it can get frozen while driving in those weird conditions). The one (maybe two?) problem events I have had have been - get this - have been WINTER RELATED.I drive in 90s and triple-diggies in summer when I have to. I have run Aux-fan-only, on an M62TU with a supercharger fitted, for something like 4-5 years.and before I knew it." there've been some of those I think.) cases of "mech fan puked and then I discovered the Aux fan was dead because it never ever ran and was seized up. I'm not aware of any full on "Aux fan died and killed my car" stories (OK - at least none involving 'Visco-deleters'. MAYBE one or two stories where an Aux fan died and caused a stranding.
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