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Message: [QUOTE="cowboy_dan, post: 72058, member: 258"] There are 2 transmission coolers on the OBS, and I suspect also on the SD trucks. There is an oil to water (OTW) cooler at the bottom of the radiator, and then there is the oil to air (OTA) cooler in front of the radiator/condenser (for those with A/C). Bypassing the OTA cooler probably wouldn't make much difference, especially when running unloaded. It's only a single U-loop of tubing with fins, maybe 20-23 inches of tubing at best. Now, bypassing the OTW cooler on the other hand, that would definitely make the temps rise. Before you go adding more OTA coolers, make sure the OTW cooler is being used. If it's not, find out why. OTW coolers are much more effective & efficient than OTA coolers. [/QUOTE]

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