Quote from: AJP turbo on April 21, 2018, 02:37:32 AM
Do you not have the trans cooler? I thought the bypass thermostat valve prevents the fluid flow until the temp is reached?
Great question brad. yes i do have the aux trans cooler which made it a lot easier to just pop off a hose to drain from. No disconnecting the hard lines or anything.
The trans bypass thermostat was a concern . . . I drove the car and got it fully warmed up(190*) before starting the job and just drove it on ramps and drained the pan real quick before it cooled down much. I believe the PP thermostat opens at 160*.
That may be difficult for guys that haven't switched to the cooler trans t stat though . . i think they don't open until 180 or 190.
The couple times a started the car to drain the fluid the trans temp on the x4 read around 130. However, i'm guessing the sensor is in the pan which was mostly fresh fluid and not the same temp as the thermostat sees. Regardless, the fluid kept flowing from the by pass block so it was never a problem for me.
The strange thing i'm still trying to wrap my mind around though . . . is that the fluid was coming out of the BOTTOM line of the bypass block from the trans. This is the opposite direction of what i've seen it's supposed to do. I thought the bottom was the return line.
I'm looking into it more but that may be why i didn't see much additional cooling from the aux cooler when i installed it. It seems it's going through the aux cooler first then the AC condenser then back to the trans.