Dphillip said:
When you are hauling your camper do you use the tow/haul feature on your truck? I definitely use mine when I'm towing my jeep but I wonder if it's necessary to use it when hauling the camper only. I really can't tell too much difference when the feature is on or off with just the camper on? The owners manual is it real clear when do use the feature when hauling only.
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I live in the prairies which are virtually flat. I don't need to us the tow/haul feature within 3 hrs of my home. It wouldn't make any difference.
If I go into British Columbia, I use the tow/haul feature and it makes a big difference in the transmission temperature. It runs cooler in the tow haul mode. You may think to yourself that you are burning more fuel because it holds the higher RPMS longer, but I don't know if that is necessarily the case, because the truck is it's power band and not lugging at all.
With the trailer in tow, it's probably best to always have in tow/haul mode. I wish it could retain that setting if desired. Sometimes I forget to put it in tow/haul mode, but if the difference is that subtle that it takes an hour to notice, likely it's not that big of a deal. Especially given that you have the added transmission cooler with the factory tow package.
I suggest you get used to seeing what you transmission temps normally are, without the camper, with the camper and once again with the camper and towing.
p.s. the factory crimp fitting on GMC/Chevy transmission cooler lines are NOTORIOUS for leaking (I'd almost call it a feature). Yours is almost guaranteed to leak at some point in it's life. Keep an eye on it. It's an expensive factory repair. I suggest getting it replaced before your warranty expires, if that is still an option.