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Thread: Radiator wrong tranny oil flow? Reply to Thread
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  Topic Review (Newest First)
03-18-2020 10:35 AM
ZblackliZard
Quote:
Originally Posted by AlamoJeeper View Post
On your "User CP" page (User Control Panel), your location goes in the page linked by the "Edit Your Details" link on the upper left side and your Jeep's data goes in the page linked by the "Edit Your Jeep Information" link just below the "Edit Your Details" link.

For location, you can just give your country if you wish. But the more you narrow down the location, the better we can evaluate any effects of your climate.

And don't worry, we all started out not knowing anything about our Jeeps. I'm still asking questions all the time as I get into new systems.
Done and Done Thanks!
03-17-2020 10:49 PM
AlamoJeeper On your "User CP" page (User Control Panel), your location goes in the page linked by the "Edit Your Details" link on the upper left side and your Jeep's data goes in the page linked by the "Edit Your Jeep Information" link just below the "Edit Your Details" link.

For location, you can just give your country if you wish. But the more you narrow down the location, the better we can evaluate any effects of your climate.

And don't worry, we all started out not knowing anything about our Jeeps. I'm still asking questions all the time as I get into new systems.
03-17-2020 06:05 PM
ZblackliZard
Quote:
Originally Posted by AlamoJeeper View Post
The in radiator tank transmission cooler is on the cool side of the radiator. The engine coolant temperature gauge sensor is on the hot side of the radiator. The coolant on the cool side of the radiator goes to the water pump to be pumped through the engine. That is what cools the engine. So the transmission fluid is deliberately put in the cool side of the radiator.

Like Timo says, a thermostat bypass between the transmission and the cooler(s) at the front of the vehicle is the best solution. And like those braided lines and AN fittings.

It will help us help you if you include your Jeep's year, engine, and other particulars in your profile. Also location. If you don't want to be specific on your location, you can include your state, province, or country if it is a smaller country.
I already have my ZJ's info in my garage except if i did it wrong?
anyway it's a 93 V8 5.2
03-17-2020 06:00 PM
ZblackliZard Well now I feel dumb, Just found out my ZJ already has an auxiliary tranny radiator, Part of the tow package i guess?
02-23-2020 08:45 PM
AlamoJeeper The in radiator tank transmission cooler is on the cool side of the radiator. The engine coolant temperature gauge sensor is on the hot side of the radiator. The coolant on the cool side of the radiator goes to the water pump to be pumped through the engine. That is what cools the engine. So the transmission fluid is deliberately put in the cool side of the radiator.

Like Timo says, a thermostat bypass between the transmission and the cooler(s) at the front of the vehicle is the best solution. And like those braided lines and AN fittings.

It will help us help you if you include your Jeep's year, engine, and other particulars in your profile. Also location. If you don't want to be specific on your location, you can include your state, province, or country if it is a smaller country.
02-23-2020 09:21 AM
ZblackliZard The coolest it gets here in lebanon is like -5 Celsius so I don't think it qualifies as cooler climate. I think I'll go with the aux radiator. Thanks anyway guys
02-23-2020 02:48 AM
Timo_90xj On cooler climates bypassing the radiator will result in slow warm-up and also may cause tranny to be too cold in very cold temps. In-line fluid thermostat between cooler supply and return lines is the best solution to that issue.

02-19-2020 04:32 AM
Zilliver The main radiator will get hot - engine coolant will heat it up, the external one will not. So if you only use the external, it will be cooler.

Only thing to think about is if you live in the cold climate, the main radiator will not help to warm up the tranny oil, so your transmission will take a lot longer to be at the operating temperature.
02-19-2020 03:29 AM
ZblackliZard there is something that's bugging me though. I thought adding an auxillary radiator in addition to the one built in would be the best way to cool my transmission. How is bypassing the main radiator gonna give me more cooling?
02-19-2020 03:26 AM
ZblackliZard
Quote:
Originally Posted by Mr. Puddles View Post
Bypassing the radiator depends on where you live. If you are in a hotter climate (such as the desert) then yes its generally easier on the trans to bypass it. I notice your avatar pic has a euro style plate on it. Where do you live?

If the pump is not working then you wouldnt have transmission function. We need to figure out where the flow blockage is. Pull the rubber hose off the metal line by the radiator. If you dont get any fluid move closer to the trans and see if there is any other rubber line. If so disconnect that and see if you have fluid. If not maybe @Timo_90xj can chime in and say if the metal lines can be pulled off the trans or not.
So i live in Lebanon but i drive her mostly off-road on the snow. As you may have noticed it is on 33 inch tires, may get 35's in the future. I'll try to check the fluid later on today and i'll get back to you with whatever i find.
02-18-2020 04:17 PM
Mr. Puddles
Quote:
Originally Posted by ZblackliZard View Post
So you're saying bypassing completely the radiator would be better to keep my trans cool? I don't think the cooler is bypassed by some hose, the lines must be clogged (or could it be the oil pump?) anyway i drove it for like 200miles since i got it rebuilt could i have killed it again (i did not check on the flow again)?
Bypassing the radiator depends on where you live. If you are in a hotter climate (such as the desert) then yes its generally easier on the trans to bypass it. I notice your avatar pic has a euro style plate on it. Where do you live?

If the pump is not working then you wouldnt have transmission function. We need to figure out where the flow blockage is. Pull the rubber hose off the metal line by the radiator. If you dont get any fluid move closer to the trans and see if there is any other rubber line. If so disconnect that and see if you have fluid. If not maybe @Timo_90xj can chime in and say if the metal lines can be pulled off the trans or not.
02-18-2020 04:05 PM
ZblackliZard
Quote:
Originally Posted by Mr. Puddles View Post
When you checked it was the vehicle running? To get accurate measurement I believe it needs to be warm, running, and in Neutral.

If you unplug the lines and nothing comes out it sounds like the lines are clogged or they bypassed the cooler with some sort of hose. Without being able to actually crawl under it and look its tough to tell for sure.

As far as adding a secondary cooler...


Based on what I have seen from other users on here that have done so they added it after (or in place of) the built in trans cooler. The built in cooler is helpful if you live in colder climates as it helps to warm the trans up quicker. Down side is it can also add heat to the trans fluid if the radiator gets excessively hot. Another down side (and the primary reason I plan to completely bypass the radiator) is the possibility that the cooler can leak and allow coolant into the trans (pretty much a death sentence).
So you're saying bypassing completely the radiator would be better to keep my trans cool? I don't think the cooler is bypassed by some hose, the lines must be clogged (or could it be the oil pump?) anyway i drove it for like 200miles since i got it rebuilt could i have killed it again (i did not check on the flow again)?
02-17-2020 01:11 PM
Mr. Puddles
Quote:
Originally Posted by ZblackliZard View Post
I did not do the rebuild however as of what i saw they got a pan of around 50cm diameter at like 5-10 cm height. i did dipstick it beforehand though and it was a bit higher than recommended level. I am adding an auxiliary radiator soon, so i understand when i unplug the lines i should get oil spill out now or this would mean the lines are clogged? and while i got you there should i add the auxiliary radiator before or after the main one or it doesn't matter?
Thanks for your help!
When you checked it was the vehicle running? To get accurate measurement I believe it needs to be warm, running, and in Neutral.

If you unplug the lines and nothing comes out it sounds like the lines are clogged or they bypassed the cooler with some sort of hose. Without being able to actually crawl under it and look its tough to tell for sure.

As far as adding a secondary cooler...


Based on what I have seen from other users on here that have done so they added it after (or in place of) the built in trans cooler. The built in cooler is helpful if you live in colder climates as it helps to warm the trans up quicker. Down side is it can also add heat to the trans fluid if the radiator gets excessively hot. Another down side (and the primary reason I plan to completely bypass the radiator) is the possibility that the cooler can leak and allow coolant into the trans (pretty much a death sentence).
02-17-2020 12:44 PM
ZblackliZard
Quote:
Originally Posted by Mr. Puddles View Post
OK so in my mind the first most likely issue is low fluid level in the trans (which would match up with a premature failure of the trans). The next option would be that the lines are plugged somewhere close to the trans. Id say that's highly unlikely but it all depends on the quality of the tech that installed the trans after the last rebuild (the shop that did mine gave me a GM dipstick and tube then claimed I did it.). When you pulled the trans out how much fluid did you get out of it?
I did not do the rebuild however as of what i saw they got a pan of around 50cm diameter at like 5-10 cm height. i did dipstick it beforehand though and it was a bit higher than recommended level. I am adding an auxiliary radiator soon, so i understand when i unplug the lines i should get oil spill out now or this would mean the lines are clogged? and while i got you there should i add the auxiliary radiator before or after the main one or it doesn't matter?
Thanks for your help!
02-17-2020 11:31 AM
Mr. Puddles
Quote:
Originally Posted by ZblackliZard View Post
Correct.
Ok so in my mind the first most likely issue is low fluid level in the trans (which would match up with a premature failure of the trans). The next option would be that the lines are plugged somewhere close to the trans. Id say thats highly unlikely but it all depends on the quality of the tech that installed the trans after the last rebuild (the shop that did mine gave me a GM dipstick and tube then claimed I did it.). When you pulled the trans out how much fluid did you get out of it?
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