Offroad Trailblazers and Envoys

Temp on inclines

Trailblazer and Envoy related, but not off-road related...

by Flying Monkey » Wed Aug 10, 2011 6:51 pm

This weekend going up Signal Mountain to go trail riding I noticed my temps get up to about 230 going up the mountain. It was paved road traveled by people everyday. Once up there and on level road temp went back to normal. Is this a common occurrence for the TB? Ive had other cars and trucks and never had 1 jump so far in temps on same road. My thermostat was replaced in Dec for running too low and throwing code. I wasnt too concerned with it since it went right back down but was curious if it was common or not
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by The Roadie » Wed Aug 10, 2011 9:35 pm

Very common. Either tune your fan clutch table to come on more aggressively above 220 degrees, or add a switch to apply constant 12V to the fan clutch power line to get 100% engagement and max cooling.

Also get a tranny cooler if you don't already have one. The radiator is warmed up also by the transmission, which could be at 240-250 if you don't watch it with a Scangauge.
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by Flying Monkey » Wed Aug 10, 2011 10:16 pm

The Roadie wrote:Very common. Either tune your fan clutch table to come on more aggressively above 220 degrees, or add a switch to apply constant 12V to the fan clutch power line to get 100% engagement and max cooling.

Also get a tranny cooler if you don't already have one. The radiator is warmed up also by the transmission, which could be at 240-250 if you don't watch it with a Scangauge.



yeah I plan on adding a trans cooler soon. Would I have to bypass anything in the system to add the switch? Or would I just be able to add it and use it when I felt it was needed? Wish it was just a regular old flex fan.

Are those scanguages really worth their cost? Ive looked at them but wasnt sure if I would get my moneys worth. Have alot I want to do to my TB but not sure if something like that should go ahead of the line.
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by Trail X » Thu Aug 11, 2011 8:47 am

I think the scangauge is worth it. I use it every time I'm in the car.

It doesn't sound like you'll need to bypass anything permanently, just tap in a wire to the fan input.
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by The Roadie » Thu Aug 11, 2011 9:40 am

Fan clutch bypass doesn't need any fancy diodes or anything as posted on the OS. Just take 12V from the fan clutch fuse using an add-a-fuse gadget, take it through a switch (10A max) in the cabin, and tie it into the white wire (pin B) in the 5-wire fan clutch harness. If you use the fan clutch fuse instead of straight to the battery, you won't have any problem with parasitic drain or backfeeding like the diode guy had on the OS. The fan clutch fuse is switched off by the ignition switch, is the secret.
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by Flying Monkey » Thu Aug 11, 2011 11:55 am

Good deal, thanks guys
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