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Which cooler line is return? #5334618 01/28/20 11:39 AM
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LeakySeals Offline OP
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2005 Chevy Classic which is the same as the 5th gen Malibu. Wondering if the line I circled is the return line. Or if it's the bottom one . Want to use it for an ATF exchange. [Linked Image]


06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k Maxlife HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
06 Altima 2.5L 167k unk
Re: Which cooler line is return? [Re: LeakySeals] #5334632 01/28/20 12:00 PM
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supton Offline
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Pull the line and start the engine, and see what direction the mess is shooting?

Might want to do that Walmart instead of home though. LOL


2011 Toyota Camry, base, 2.5L/6MT, 201k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 157k, ours
1999 Toyota Camry LE, 2.2L/4AT, 223k, his
Re: Which cooler line is return? [Re: LeakySeals] #5334641 01/28/20 12:16 PM
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AlaskaMike Offline
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Hm. Well, regardless of whether you're at home or Walmart, I would trace the lines. The top one looks like A/C to me, and the bottom one looks like it might be transmission fluid.

Might be worth doing some Google searches, or even picking up a Haynes manual.

Re: Which cooler line is return? [Re: LeakySeals] #5334650 01/28/20 12:24 PM
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Donald Online Content
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Do you have a IR thermometer? Return will be cooler. Typically upper is supply and lower is return.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Which cooler line is return? [Re: LeakySeals] #5334655 01/28/20 12:29 PM
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demarpaint Offline
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I touch them, the return line is going to be cooler.


God Bless Our Troops

Re: Which cooler line is return? [Re: Donald] #5334668 01/28/20 12:47 PM
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LeakySeals Offline OP
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Originally Posted by Donald
Do you have a IR thermometer? Return will be cooler. Typically upper is supply and lower is return.

I just tried that and it says the top one is warmer. But when I tried the truck which I know the top one is the return that's also warmer. Oh well I guess I'm putting two hoses in place just in case


06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k Maxlife HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
06 Altima 2.5L 167k unk
Re: Which cooler line is return? [Re: LeakySeals] #5334674 01/28/20 12:49 PM
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LeakySeals Offline OP
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Maybe because it's cold here the opposite is happening and the the return will be warmer as it passes through the radiator?


06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k Maxlife HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
06 Altima 2.5L 167k unk
Re: Which cooler line is return? [Re: LeakySeals] #5334676 01/28/20 12:56 PM
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supton Offline
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Originally Posted by LeakySeals
Maybe because it's cold here the opposite is happening and the the return will be warmer as it passes through the radiator?

Could be. Does the transmission have a thermostat? My truck has one, and won't send ATF to the cooler if it's below a certain temperature--part of the fluid change involves bypassing the t-stat (locking it open).

Have you hit up any specific forums? Sometimes guys will post DIY's on how they did whatever work, complete with pictures.


2011 Toyota Camry, base, 2.5L/6MT, 201k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 157k, ours
1999 Toyota Camry LE, 2.2L/4AT, 223k, his
Re: Which cooler line is return? [Re: LeakySeals] #5334685 01/28/20 01:06 PM
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FWIW, The return trans cooler line on my DTS is the top one. When I did an ATF drain and fill, I screwed a fitting into the top connector and ran a hose to a bucket.


2011 Cadillac DTS. No the headgaskets have not blown.....
5W-30 Napa Full Synthetic with a Carquest 85522 (Wix) Filter
Re: Which cooler line is return? [Re: LeakySeals] #5334702 01/28/20 01:34 PM
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LeakySeals Offline OP
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Well I won't know today. Because my hose set up won't work on this car. I need a different fitting. It's a flange like a brake line. I'll have to get that kind of fitting to attach to my hose [Linked Image]


06 Escalade 6.0L LQ9 AWD 170k M1 5w30
03 Maxima 3.5L 170k Maxlife HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
06 Altima 2.5L 167k unk
Re: Which cooler line is return? [Re: A_User55555] #5334730 01/28/20 02:07 PM
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Brian123 Online Content
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Originally Posted by A_User55555
FWIW, The return trans cooler line on my DTS is the top one. When I did an ATF drain and fill, I screwed a fitting into the top connector and ran a hose to a bucket.

Correct

Re: Which cooler line is return? [Re: LeakySeals] #5334752 01/28/20 02:48 PM
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Kestas Offline
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Once you figure it out, put markings on the lines so you don't need to figure it out next time.

Re: Which cooler line is return? [Re: Kestas] #5334806 01/28/20 04:32 PM
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MasterSolenoid Offline
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Originally Posted by Kestas
Once you figure it out, put markings on the lines so you don't need to figure it out next time.

I agree, your future self will thank you.
Draw a sketch of the Radiator and Transmission with any hoses.
Then add 'arrows' -> showing direction of fluid flow.

Knowing the direction of flow would also help if you ever install an Inline Filter.


Last edited by MasterSolenoid; 01/28/20 04:35 PM.

2002 Ford Ranger / bought new
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Re: Which cooler line is return? [Re: LeakySeals] #5335104 01/29/20 02:44 AM
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from what Information I gathered usually the top line is the return line.

and now that I type this I remember when flushing the trans fluid out of my thunderbird that is the line i unhooked to drain out the old fluid while running it, I hooked up a hose around the fitting on the radiator to flush out the fluid.


I'd buy Callahan autoparts if I could.
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