omega_rugal Posted January 8, 2017 Share Posted January 8, 2017 after i installed the new radiator on the MJ i noticed two unused plugs, a threaded cooper one and one that can fit a hose, are those mean for an auto transmission? isn`t the trans cooler a separate radiator? Link to comment Share on other sites More sharing options...
Eagle Posted January 8, 2017 Share Posted January 8, 2017 Nope. The external tranny cooler was an option that came as part of the trailer tow package. Link to comment Share on other sites More sharing options...
Minuit Posted January 8, 2017 Share Posted January 8, 2017 Those are for an automatic, yes. There was an external cooler that was also offered. Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 8, 2017 Share Posted January 8, 2017 after i installed the new radiator on the MJ i noticed two unused plugs, a threaded cooper one and one that can fit a hose, are those mean for an auto transmission? isn`t the trans cooler a separate radiator? Yes, those are the supply and return connections for the AW4 ATF coolant lines. With a manual tranny they are just capped off. Link to comment Share on other sites More sharing options...
omega_rugal Posted January 8, 2017 Author Share Posted January 8, 2017 sooo those run through the coolant? mmm interesting... Link to comment Share on other sites More sharing options...
Dzimm Posted January 8, 2017 Share Posted January 8, 2017 sooo those run through the coolant? mmm interesting... They don't run into the actual coolant. There are separate lines inside the radiator to cool off the Trans fluid. The radiator is just pipes running back and forth and they have the fluids running through them. The coolant entering the radiator will be at about 190* or more so it's not going to cool off anything, it's the wind passing through the radiator that cools the coolant and Trans fluid if you had an auto. You technically could use those unused lines for some other fluid to be cooled if you wanted since you don't need them. Link to comment Share on other sites More sharing options...
johnj92131 Posted January 8, 2017 Share Posted January 8, 2017 Using the same part, instead of 2 (or more) slightly different parts solves a whole lot of problems. Many companies do this all the time. First, it cuts down on expensive set up time for each (slightly) different part. Second, it reduces inventory requirements. Third, it reduces production costs by allowing longer (less expensive) production runs for parts. All these things make it easier and less expensive to support an older, out of production car/truck for its full life cycle. Link to comment Share on other sites More sharing options...
omega_rugal Posted January 8, 2017 Author Share Posted January 8, 2017 They don't run into the actual coolant. There are separate lines inside the radiator to cool off the Trans fluid. The radiator is just pipes running back and forth and they have the fluids running through them. The coolant entering the radiator will be at about 190* or more so it's not going to cool off anything, it's the wind passing through the radiator that cools the coolant and Trans fluid if you had an auto. You technically could use those unused lines for some other fluid to be cooled if you wanted since you don't need them. i know, since coolant doesn`t leak thou there... actually i want to heat up something, not cool it, that would be easier... Link to comment Share on other sites More sharing options...
Dzimm Posted January 8, 2017 Share Posted January 8, 2017 They don't run into the actual coolant. There are separate lines inside the radiator to cool off the Trans fluid. The radiator is just pipes running back and forth and they have the fluids running through them. The coolant entering the radiator will be at about 190* or more so it's not going to cool off anything, it's the wind passing through the radiator that cools the coolant and Trans fluid if you had an auto. You technically could use those unused lines for some other fluid to be cooled if you wanted since you don't need them. i know, since coolant doesn`t leak thou there... actually i want to heat up something, not cool it, that would be easier... Idk how well it would work to heat something. I don't think the heat dissipation from the coolant would be enough to counteract the cooling from the wind to heat whatever it is you want to heat. Maybe a few degrees warmer. I definitely could be wrong though, would be interested to see how well that would work. Link to comment Share on other sites More sharing options...
DirtyComanche Posted January 8, 2017 Share Posted January 8, 2017 Normally the trans cooler is just a separate little 'tank' style exchanger in the end cap of the radiator on the 'cold' side. Guys have used them for warming up water for a shower or whatever, but the amount of BTUs that you can get out of it is limited as the whole engine cooling system has to be pretty well saturated and it's not that big of a heat exchanger. You can buy plate style exchangers and splice it in the heater lines if you want better output. Expedition Portal is the place to go for that sort of stuff, IMHO, lots of DIYs and writeups on there for projects like that. Link to comment Share on other sites More sharing options...
gogmorgo Posted January 8, 2017 Share Posted January 8, 2017 The other advantage to putting the tranny lines through the radiator is that when it's cold out it helps warm up the ATF to a more useful temperature. On cold starts (like parked overnight around -30°F) using the block heater (vs having it plugged into a tripped breaker :fs2: ) also makes a noticeable difference in how the trans grabs gears right off the bat, just from that little bit of extra heat in the coolant. Link to comment Share on other sites More sharing options...
omega_rugal Posted January 9, 2017 Author Share Posted January 9, 2017 i want to run coolant throu it to keep the lpg reducer warm, so far i have been using it dry, it works it hasn`t freeze but does get really cold after 20 mins or so... why i run it dry? well, because i was tuning it, the reducer is "one of those" that have the knobs inside, so i had to take it apart for every adjustment, plugging hoses and refilling the coolant everytime was drving me crazy...now is working fine, starts smooth as silk, idles good and develops full power underload (except for that damn unadjustable timing) for the tuning i wasn`t running the engine for long periods so freezing was not an issue, no is ready to hit the streets.. Link to comment Share on other sites More sharing options...
DirtyComanche Posted January 9, 2017 Share Posted January 9, 2017 Use your heater lines instead. If it's cold out your tstat will stay closed, and there will be little to no heat in the rad. Also, you're going to need some sort of a pump to move coolant if you try to do it with the trans cooler as whatever convection based flow you get will be extremely minimal. 99% of conventional propane installs use the heater lines for a reason. Link to comment Share on other sites More sharing options...
gogmorgo Posted January 9, 2017 Share Posted January 9, 2017 Yeah, when I said the difference was noticeable, it's more when I shift to reverse, if the block heater wasn't plugged in it "hangs" for 2-3 seconds before I can feel it grab, and same thing again shifting to drive at the end of the driveway, but it's only about one second with the block heater plugged in. Like Dirty says, there's not much coolant flow through a closed thermostat. I'll also point out that if you still have the heater valve in the loop, your heater lines won't flow any coolant unless you've got the heat turned on. Best to just delete it. Link to comment Share on other sites More sharing options...
omega_rugal Posted January 10, 2017 Author Share Posted January 10, 2017 I was using the the hoses that go to the heater but that part of the hood is too crowded, since i ditched the air box the reducer sits there...here winter is not that hash, hardly ever goes below 4 degrees C, during the test runs it was like 10 degrees and even so the reducer just got a little cold and yes i plan to put a small pump to keep coolant flowing if it fails i will try to put the reducer back where it was, a pain in the @$$ i try to avoid... Link to comment Share on other sites More sharing options...
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