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Ducted Radiator
For years I've been driving around with my grill 100% blocked. I finally got tired of replacing radiator fans because of it constantly turning on and off so, I cut a hole in my grill block. My transmission cooler was not very effective either, so I upsized it also. I used some coroplast "surplus" signs to make my ducting. It is just jamed in there. I made the duct as wide as the trans cooler and radiator even though the grill block hole is much smaller, just as wide as the licensce plate, just in case I want to block it again.
The results are great. The fan has only turned on in stop and go traffic and the temps stay under 210 on the highway. The trans temp is way lower because it now has significant air flow and a three times larger cooler. On the down side, it takes waaaay longer to warm up. It would be nice to have an on the fly grill block.
It seems like it has helped the instant mpg numbers slightly, but if it did help, it is very small.
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