Trans Temp Important for Fuel Economy?

[jeff88]

So something like this wouldn't work than?



In your setup, if I do the 2 way valves with the normally open and normally closed, I'm not sure how that would work. If one valve closes, how does fluid flow through the other line? Are they two completely separate systems, but controlled by the same thermostat? Is there a tee somewhere where if the valve closes, the pressure will force the ATF into the other side of the tee and go through the other side of the system?

[oil pan 4]

The 2 way system I described using the GM style "heater" and a straight up Air to oil cooler would need 2 thermostats or a thermostat and thermal switch.
My normally open and normally closed solenoid valve was just a fail safe, could be done with 2 normally closed or 2 normally open switchs.
Actually 2 normally open solenoids might be better.
If the transmission has a lockup torque converter then it will need the "heater" most of the time during the cooler months.

In another post on diesel place I installed an air to engine oil cooler. But I don't want the air/oil cooler flowing at all during winter so I installed a manual ball valve to close off the A/O cooler completely, then for during summer I installed a normally open solenoid valve in line with the ball valve to close off cooler flow during the summer, until the engine warmed up.
I used a normally open valve for 2 reasons, one so if the electrical system failed, it would fail open, the better condition to be in when its hot out, the second reason is when the manual ball valve is opened for summer time use the solenoid valve will need to be open most of the time anyways and that will save power and keeping the valve "off" most of the time should help it last longer.
I left the function of the factory engine oil cooler inside the radiator alone, it flows all the time, the A/O cooler is just there to help it out.

[XYZ]

Originally Posted by jeff88

So something like this wouldn't work than?



In your setup, if I do the 2 way valves with the normally open and normally closed, I'm not sure how that would work. If one valve closes, how does fluid flow through the other line? Are they two completely separate systems, but controlled by the same thermostat? Is there a tee somewhere where if the valve closes, the pressure will force the ATF into the other side of the tee and go through the other side of the system?

After viewing your diagram with the type of stars displayed I couldn't help but wonder - was this tranny made in Israel?

[jeff88]

So after some more research, I realized that I don't need all this fancy bypass stuff. The cooler has a built-in bypass that only allows thin fluid (e.g. hot) to pass through and thick fluid (e.g. 'cold') to bypass and go back to the tranny.

The unit monitors resistance to flow by allowing a controlled amount of ATF to pass through a self-regulating orifice. Controlled by viscosity, thicker ATF is returned directly to lube through two bypass openings in the stacked plate core, while thinner ATF is directed through the core to cool as operating temperatures increase.

Amazon B&M 70264

[oil pan 4]

I used a cooler like that for my engine oil cooler, believe it was a chevy luminia transmission cooler in its previous life.

[jeff88]

I take it no complaints then? This is the 'standard' aux cooler on my 4Runner forum, so I imagine it works pretty well.

[oil pan 4]

You will never know how well it works until you put a gauge on it.