Active Grille Shutters

[CKN]

Originally Posted By: tcp71
This is so outdated. Ford's 6r80 and now 10r80 transmissions from 2009 onward have a thermostat inside that doesn't even flow any through the cooler until 190f. 207f is fine for a modern LV or ULV transmission fluid. An 05 f350 probably still uses Mercon 5 and has isn't pertinent to this conversation.

Originally Posted By: MarkM66

http://www.tciauto.com/tc/trans-life-expectancy/


This chart is easily 20 years old and is no longer valid with the improvements in transmission fluid.

 

[supton]

Originally Posted By: 555
The reality is that we have no idea why the trans temp was higher. I know it's a forum board and the idea is discussion but to single out a feature without knowing the other numerous variables could be a case of connecting dots that aren't even on the same page.


Well, we don't what the coolant temp was for either trip, nor what vehicle speed was used on the prior trip. If vehicle speed was higher on the second trip that could be the culprit: higher engine speed will generate more heat in the transmission pump. Higher ambient temperature can mean higher coolant temp. Both together would explain a 13F bump in transmission fluid temperature.

 

[ram_man]

I actually removed the shutters on my Dart because I did not like how much airflow they block took about 5 minutes to remove the shutters haven't noticed any difference in fuel mileage or any of that. But the engine bay definitely feels cooler after you're driving it hard.

 

[MNgopher]

Lots of good info in this thread. As pointed out by others, the transmission temp chart in this thread is for older fluid. Newer fluids and transmission routinely run hotter. The 6R60 in my Explorer and 6R80 in my F150 don;t allow any flow to the coolers until the internal temp hits 190F, and they run normally between 200 and 205 degrees.

And without a whole bunch of other information, there are a lot of reasons the fluid temp would be different - the shutters only being one of them.

My F150 has the active shutters, and I monitor them via torque. Very interesting to watch the logic. If the A/C is on with anything above a medium demand, they are full open. Below that they cycle. Without the A/C, they stay closed until the coolant temp hits 185. Then they open slowly, typically staying about 12-13% open under normal driving. They go half open when coming to a complete stop and auto start stop turns the engine off. They default to about 30% open in temps below 35 degrees to prevent icing problems.

 

[fdcg27]

Assuming that GM did their homework, as they probably did, I don't think that you have anything to worry about.
My main concern would be with the shutters failing to open at some future date due to corrosion or failure of the actuator motors.

 

[turtlevette]

A great engineer once said the more they over think the plumbing, the easier it is to stop up the drain.

Too much complexity. Most of these newest vehicles will be beer cans 40 years from now. Or energy drink cans. My old corvette and trans am will still be motoring like a muther.