L31MaxExpress
I'm Awesome
Actually, I am not sure about the heater question. I have often wondered just how much the heater figures in to things. In overheat emergencies, which happen all too often during a life in the desert, we always turned the heater on high to try to suck some extra heat out of the motor.
In this case, it is a moot point, as I have the heater on a manual on/off valve. I do not want that hot water sitting in my A/C box.
What do I want? We really do have 125+ degree days here. Lots of them. Sometimes 115+ in the middle of the night. Manufacturer's extreme conditions testing ground is near here for a reason. Our cooling systems must be Super Duty +++. This is a stock engine-- no performance improvements such as headers or high compression that would complicate cooling.
I want enough cooling performance that it will sit at a long stoplight, and never go above the thermostat rating temp, with the A/C on and 120 degrees ambient temp.
It's not impossible; the cop cars idle for days without a "China Syndrome"!!
I am looking at handheld anemometers to check airflow. As I mentioned, there is room in my fan shroud for a larger diameter fan. How critical is that fit?? Could this be my problem?? Again, once traffic starts rolling, it cools right back down, but it's at 200+ and climbing at the stop.
Thanks,
Vettepilot
If your truck is a Vortec with a spin on fan clutch should be relatively easy to use the Duramax blade. GM 1580690 on the Hayden 2851 clutch. I ended up having to trim a bit of the blade length to fit in the fan shroud of my Express van. It has not been a problem. I followed the contour of the blade, marked the distance I needed to trim, IIRC it was 5/8" or so, then trimmed the first blade. I used the trimmed off piece as a templete to mark the rest of the blades. A sharp pair of scissors or tin snips will go right through the plastic blade. Even with the blades trimmed a bit, the Duramax fan has a lot more surface area and pitch than the 11-bladed tow package fan.
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