Engine/Transmission (1998.5 - 2002) What is the hose size for the water pump to transmission water heat exchanger on an 02 ETC?

[rweis]

Does anyone know the hose size that connects the water pump to the transmission water heat exchnager on an 2002 automatic?



I am tired of fighting the metal tubing and am going to go to a full hose hookup from the water pump to the transmission water heat exchanger and back.



Would be a lot easier to verify the size before I start hose looking.



Bob Weis



Why did DC put it in metal (with rubber end connectors) to start with?

 

[**ICEMAN**]

bob,,it either 3/4 or 5/8. i'll check and post back.

i too had issues with the metal lines on my '94 ever since i started using a salt spreader on the truck. the right front wheel slings salt etc right up on the cooler lines. mine were so brittle they fell apart when i went to pull them off.

i removed the exchanger and routed the trans fluid straight to the front cooler.

i have seen trans oil temps of 200 (in exit line) while plowing since removing the exchanger and plan on putting another cooler with a fan between the trans and front cooler like i have on my '01

200 in exit line is not supposed to be a problem but i don't feel comfortable with it being that high.

everyday driving shows an average of 145 degree's in exit line without heat exchanger.

 

[**ICEMAN**]

5/8 " hose water pump to exchanger

 

[Bob4x4]

I would guess the reason for the metal is to keep it alive running next to the exhaust manifold. On my truck even with the ceramic coating it gets a bit toasty for rubber to survive. There is also a new silicone hose kit available now from Mrbobsdistributing to help out.



Bob

 

[rweis]

My concept is to change the metal to hose but route it away from the heat. Basically get the metal run out of the way of the manifold and oil filter head.



I want to be able to more easily check manifold nuts and not fight the metal water line. I can see why DC ran metal lines since NO ONE was ever going to make any modifications, right?



I also plan to put a oil pressure sensor in the top of the oil filter head probably on a length of snubber line, but the metal water lines prevent you from getting to the 1/4" NPT on top of the oil filter cleanly. I tried to get to the 1/4" NPT port with a 90* elbow and a 2 " extension, but you can not tighten it up correctly and still have the 90* elbow pointing toward the right inside fender so you could connect a snubber line.



Anyway, I needed the size so I can shop for hose to do rerouting. Maybe even add a secondary radiator / fan, we'll see. Do have to be careful to be able to maintain sufficient temperature though.



5/8" ID right? And I will check Mr Bobs Distributing, thanks.



I'll let you know how it turns out.



Oh, BTW, I once asked Bill K at DTT about not using the water heat exchanger and he said "NO, in NO way bypass the water heat exchanger. Understand NO?" I thought that was pretty clear, lol.



Bob Weis

 

[**ICEMAN**]

Oh, BTW, I once asked Bill K at DTT about not using the water heat exchanger and he said "NO, in NO way bypass the water heat exchanger. Understand NO?" I thought that was pretty clear, lol.

yea,,i know,,he yelled at me for asking the same question a while back :-{}

i'm sure he meant to say,,"don't remove it without adding another aux. cooler in line".

with twin turbo's the heat exchanger must go. add an aux. cooler inline and have lower trans temps than you ever had with the exchanger hooked up(working,playing,etc,etc)

shouldn't be any different if you remove it on a single turbo truck