Okay, so I have officially deleted the air conditioning, the mechanical fan, and the giant fan shroud/overflow tank in the front of the engine bay. Here's a poorly-lit shot of the engine bay with just over 35 pounds of stuff removed. I can definitely feel a difference in power with the fan removed, which is super fun. I've seen dynos with anywhere from 5 to 15 horsepower gains, simply by removing a factory clutch fan from various cars before and I am now a believer.
These trucks run a mechanical fan and an electric fan from the factory. The electric fan is just a backup and it comes on at about 215 degrees and shuts off again at around 205. There have been quite a few people who simply remove the mechanical fan and rely on only the electric fan at the stock settings without issue. I figured I would give that a try and see how it worked for me. If the fan struggles to cool it down, I can always splice in an aftermarket controller that will make it come on at a lower temperature. In fact, I might do that anyway, just to be safe.
I plugged in my OBD2 scanner and connected it to the app on my phone. I brought up a digital dashboard to monitor the engine temps while I took it for a spin. While out cruising (in about 55-degree, dry weather) the temperature never once went over 205 in more than half an hour at various speeds. It mostly went back and forth between 201 and 204 and the factory gauge stayed right where it always does. I went out for a second drive a little later and pushed it a bit harder. Even when making the engine work fairly hard, the temps stayed at or below 205 the whole time, which is great. However, as soon as I pulled into my driveway, the temp started rising. I watched the digital gauge creep up past 215, heard the fan kick on, watched the temp peak at 223 very briefly, and then drop back down to 205, when the fan shut off. A few minutes later, it slowly crept back up to 215, the fan turned on, and it dropped from a peak of 218 down to 205 when it shut off again. So the factory electric fan seems to be pretty capable of keeping it from getting very hot in its current settings, which is great.
Now for the not so good news. The factory fan shroud is also the overflow tank for the coolant, as well as the windshield washer reservoir. I have a solution for the washer setup and I'll install that later. The coolant overflow is what's giving me a headache at the moment. I purchased a nice Mishimoto overflow tank that looks like this:
I ran into a lack of space problem in the OEM location, so I tried a temporary mounting solution that I think might be the culprit for my current issue. It appears to be oozing coolant out from the top of the new reservoir tank. It's vented at the top, near the lid, and I can see coolant has been forced out through those vent holes and is dripping down into the engine bay. This is what it looks like in the current position:
Here's my (potentially stupid) question: is it leaking because of the fact that it's not straight up and down, or is the reservoir too small? It's at roughly a 45-degree angle right now, because that's all I could make work in that spot. Either that angle is causing the overflow to hit the vents on top too soon, or the tank is too small and can't handle the overflow volume. I'm not sure what's more likely. Maybe it's a combination of both. I just know that it's making a mess under the hood and preventing me from driving the truck anywhere at the moment, which is quite frustrating. There are guys who shove that overflow hose into an empty Snapple bottle without issue, so why the hell is my Mishimoto overflow tank spewing coolant?
I have a whole lot more room on the other side of the radiator, so I could technically buy a longer hose and run it over to that side, with the tank placed at a proper, vertical angle. The extra hose would also expand the fluid capacity, which might help with the overflow issue if the tank is actually too small. Should I try that, maybe? If I keep it on the driver's side, I'm going to need to either cut away a big chunk of the battery tray or or make a big, weird bracket that moves the tank out from the radiator a bit. I'm not entirely sure how to fix this issue at the moment, so input from anyone who's struggled with a similar dilemma would be super helpful!