I'm looking at installing an after market ATM cooler, question is should this be additional to the factory ATM cooler, or totally replace the factory ATM Cooler.

One option would be to leave factory ATM Cooler in and add an additional in series with the factory ATM Cooler. ie extend hoses at one end to the aftermarket cooler.

Or totally disconnect the factory ATM Cooler and extend the existing hoses up to the aftermarket unit, - maybe this one I be thinking.

http://www.toyodiy.com/parts/p_J_2002_TOYO...7.html?hl=16491

In series (if daily driving for any reason).

Trans output -> Aftermarket -> Factory -> Trans input.

Keeps the transmission oil at normal temperatures when cruising/during cold weather.

Andrew

The factory cooler would help it get up to operating temperature and the aftermarket one would make sure it doesn't get overly hot, I'd keep both

If you keep the factory one you risk it splitting if you're going to give it a hard time. If it splits then you'll end up with trans oil in your coolant/engine & water in your trans & a huge bill to fix it. Not sure if it's a common problem on Japanese cars but it happens all to often on big Aussie cars. See what lharris thinks, he'd have seen a few if they are prone to splitting.

run both i reckon, when i was dealing with loads of cruisers towing 3+ ton i used to just connect them up before the factory cooler.

never had any issues with the standard stuff cracking ( made in japan eh, cant go wrong )

With the extra cooler installed does the ATM cooler system need bleeding ?

I was looking at prefilling the extra cooler and new lines with trans fluid then connect up and run ?

Is the trans cooler fluid under pressure when running, I'd kind of think to get the fluid from the box, to radiator and back again it would need to be.

All you need to do is connect it all up, then take the out hose off the new cooler, run the motor until fluid comes out. Shut it down. Hook everything up, run the motor for a couple of mins. Then check/adjust your ATF level.

Does anyone know if a 10AN hose will fit correctly on the hose adapter coming out of the factory ATM cooler (part number 16495 or 16495A) in my link of the first post.

Or can a 10AN fitting screw straight into the factory ATM cooler.

Discussed with Nick but need to check on a car - yep may have to be my car.

You'll have to check the car. But I HIGHLY doubt it's a -10 hose or fitting size. Most auto trans cooler hose for cars is fairly small in size IIRC, usually 1/4" (-4 equiv) or 3/8" (-6 equiv).

I would expect a BSPT fitting. Probably 1/4 or 3/8", maybe even 1/2" stepping down to a smaller hose barb.

Andrew

Have checked on car, factory cooler has 3/8" Hose connecting cooler to metal hose feeds.
Did not remove actual fitting on factory cooler but this looks like 3/8" pipe to 8AN male screwed into cooler.

I have now changed aftermarket cooler so that I only require 3/8" Hose for connection.

ATM cooler installed, not connected to system yet.