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'98 LS adding a trans cooler.

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Old 06-09-17, 05:33 PM
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LS9698
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Default '98 LS adding a trans cooler.

While putting in a new radiator I decided to add a trans cooler (Hayden 1405) already purchased.
I'm considering the in-series method thus utilizing the coolant radiator and the separate trans cooler.

Question is does anyone know right off which hose from the transmission is the out and in? Driver or passenger side?

I don't want to start it yet because haven't added coolant yet or that would let me know.
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Old 06-10-17, 11:12 AM
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on the drivers side it flows from the front of the car to the back

these cars already have transmission coolers, are you towing things or something?
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Old 06-10-17, 11:19 AM
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Thanks for answering.
I live in South Texas, it's hot here all year and anytime you can drop a transmissions temp it is a good idea.
Cooler trans temp equals longer lasting.
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Old 06-11-17, 08:19 AM
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i have a buddy who was in dubai and there over 100 degrees most of the year, he has almost 500k on his us spec ls400 with ac on 100% of the miles, these cars are hard to kill stock and went thru harsh conditions in there research.
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Old 06-11-17, 09:32 AM
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Originally Posted by lextout View Post
i have a buddy who was in dubai and there over 100 degrees most of the year, he has almost 500k on his us spec ls400 with ac on 100% of the miles, these cars are hard to kill stock and went thru harsh conditions in there research.
yea unless you're adding extra power or frequently towing things the stock transmission setup will be perfectly adequate... but of course feel free to add an additional cooler
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Old 06-12-17, 04:24 PM
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Default ATF flow

Originally Posted by Stroock639 View Post
on the drivers side it flows from the front of the car to the back

these cars already have transmission coolers, are you towing things or something?
Thanks for the reply.
Are you 100% on this?
I've been searching to Web for a flow diagram and haven't found anything.
I'm finished installing the cooler and started it up and the drivers side seemed to get warm earlier than the passenger side.
I have an in line filter to add but need to verify flow first.

I've finally found my service manual and added a photo of the transmission cooler lines.

According to the manual, the driver side is the OUT to cooler. That explains why it got warm first when I started the engine.

Also I want to thank the members that gave their opinions.
Attached Thumbnails '98 LS adding a trans cooler.-2017-06-25-08.21.22.jpg  

Last edited by LS9698; 06-25-17 at 06:40 AM. Reason: Avoiding a BUMP
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Old 06-12-17, 05:14 PM
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Default Well it's in there

I slid some larger hose over the hydraulic lines where it will come in contact with the side of the engine radiator and other parts of the car.
It fits between the condenser and radiator just fine but only 3mm clearance for the hose clamp heads but that's enough.
Attached Thumbnails '98 LS adding a trans cooler.-20170611_144600.jpg   '98 LS adding a trans cooler.-2017-06-11-14.48.42.jpg   '98 LS adding a trans cooler.-20170612_175659.jpg   '98 LS adding a trans cooler.-20170612_175808.jpg   '98 LS adding a trans cooler.-20170612_175831.jpg  

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Old 06-14-17, 09:49 AM
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Originally Posted by LS9698 View Post
Thanks for the reply.
Are you 100% on this?
I've been searching to Web for a flow diagram and haven't found anything.
I'm finished installing the cooler and started it up and the drivers side seemed to get warm earlier than the passenger side.
I have an in line filter to add but need to verify flow first.
i'm like 99.99% certain that's the way it flows... i'm done the transmission flush myself and before i did that i even spoke directly with a lexus service tech and he told me that on the drivers side (on a US-spec car obviously) it flows from the front to the back
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