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I actually "tested" the whole fluid expansion thing and with (2) different vehicles and (2) different times of changing the fluid, it's a non-factor. I drained it hot and put it in a 5-liter bottle (with markings) and used a sharpie marker to mark the level and I waited. The fluid was 140º+ F when I started and I waited, checked the fluid temp, waited longer, checked the fluid temp, and when it finally got down to around 75-80º F, I said screw it, I'm done.... The level, for all practical purposes, did not change.
Besides, replacing it with what drained is only the starting point since our models have a dipstick. The dipstick is the final say on the level amount
Just trying to determine if hot I can get accurate read on the dipstick. Then I would let vehicle cool overnight in the garage with new bottles nearby. At that point fluid temps should be basically the same without the thermal expansion and then can do a drain, measure and refill.
As thin as ATF is, I don't think it's as critical that you drain it hot or even warm so draining it cold probably is okay. Or, drain it while warm/hot and let it continue draining for hours, overnight, whatever. It will get as much out as practical and if you wait long enough, the temperature will adjust to ambient temperature - the same temperature as your new fluid.
On most vehicles that hold 10 quarts of fluid like the G35 the volume difference between cold and operating temp is about 3/4 of a quart which is pretty significant when it comes to checking fluid level. With the 4 quarts that comes out during a drain/fill that would be roughly 1/4 of a quart, over the years that can add up to a substantial difference in fluid which would explain why that other user was getting 5 quarts out during his drain/fill.
Thus why it's necessary to always perform an actual fluid level check sometime after doing a drain/fill.
04 G35 Sedan performance package. 70k Eibach springs and sway bars. 19 inch wheels. Plenum spacer.
I just did a drain and fill Thursday night. I had the front up on Jack stands. 4 -1/2 quarts came out. I put 4 in and drove it for 20 minutes then checked. I added the other 1/2 quart.
Last edited by Pbfoot; Jun 25, 2019 at 08:11 AM.
Reason: Msp
I have Nissan Data Scan tool (paid version too) and even it doesn't access these sensors and it seems to know Nissan's systems pretty in-depth. I seem to recall that these data is only available in the TCM, which NDIS doesn't talk to. Some systems, it seems, relay data from their TCMs to the ECU where it is accessible, but Nissan does not.
Are you using the mobile app or the PC version? I'm fairly confident the PC version has a trans temp parameter
NDS III on PCs isn't publicly available. I even asked directly about 'testing' but the author directed me to the mobile app. For VQ35HR vehicles, you need version III.
I'm likely going to be installing a temp sensor and cooler soon as it bugs me not knowing how the trans is doing when I'm towing the bike. Unfortunately don't know much about these specialty fittings, so I have much to learn.
You are very detailed just for a drain and fill . I'll likely have to put a "T" in the line and a temp sensor on the return side. Not sure where to mount a gauge, I think the A-Pillar gauges look tacky.
I payed 5$ for the app and 10$ for the Infiniti add-on. Took me about a hour to work through how to find the 2 transmission temperature sensors. No more guessing about the hot range on the dipstick!
Interesting. I gotta get me an android lol. Do you know if this app works on iPhone?
It seems like very few of these type of apps work on iPhones. Biggest roadblock is usually the lack of Bluetooth "access". I have an iPhone myself but kept our son's Android phone when he upgraded. I also have a Samsung tablet if I want a larger screen.
This video walks through how to set up obd fusion with WiFi for Appel. He has another channel thats about his G37. He doesn't go through accessing the auto transmission his sedan is manual, I kick my self for not holding out for a manual lol.
Maybe recent update finds it? I have both OBD Fusion and Link with their native OBD adapter and using fine with IPhone and it failed to find any PIDs when AT ECU is scanned. Use it all the time with my GX 460 and CX-5
149: What year G do you have? What OBD dongle you are using with Fusion?
. I'll likely have to put a "T" in the line and a temp sensor on the return side. Not sure where to mount a gauge, I think the A-Pillar gauges look tacky.
