1996 LS400: Engine Fan spinning too freely ?
#31
Pole Position
Thread Starter
That is not a SC400. It is a JDM Toyota Celsior and it is natural that the fan spins freely by a hand when the engine is off because it has a hydro fan. Once the engine is started, the fan rotates sometimes slowly and sometimes fast depending on the heat generated by the engine.
We live in a small country but the summer heat and winter coldness are something special. We also have traffic jams very often. To meet those conditions, Toyota must have decided to use a hydro fan for a JDM.
We live in a small country but the summer heat and winter coldness are something special. We also have traffic jams very often. To meet those conditions, Toyota must have decided to use a hydro fan for a JDM.
1)what type of engine fan I have -- Hydro
2)Why my engine fan is "spinning too freely"-- Because its Hydro
Nevertheless, I will take the advice of LScowboy by having my Fan Fluid changed to the Dexron II or III transmission fluid since my current fluid in the engine fan reservoir has not been changed in 5 years. I will upload a picture of this fluid in the reservoir in the Morning.
Well I guess that clears my mind and I have another possible problem knocked off the list with regards to my other thread...
https://www.clublexus.com/forums/ls4...s-to-half.html
You see, though my engine temperature never rises above half, my vehicle only begins to rough idle once the temperature reaches the half mark level. Therefore, I was wondering maybe my fan clutch is spinning too freely and not providing my 1UZ with the sufficient cooling it requires, consequently leading to the rough idle when too heated....Hence my question in post #1 what is the optimal cooling temperature of these 1UZ's.
But no need to fear. If I find 10,000 ways that doesn't work or solve my rough idling problem, I haven't failed. I am not discouraged, because every wrong attempt discarded is another step forward.
Thomas Edison is with me on this one guys.
#32
Moderator
Oh yes, it also says Japan on the registration card...Thanks for the clarification Yamae...Furthermore, thanks for the explanation and confirmation about
1)what type of engine fan I have -- Hydro
2)Why my engine fan is "spinning too freely"-- Because its Hydro
Nevertheless, I will take the advice of LScowboy by having my Fan Fluid changed to the Dexron II or III transmission fluid since my current fluid in the engine fan reservoir has not been changed in 5 years. I will upload a picture of this fluid in the reservoir in the Morning.
Well I guess that clears my mind and I have another possible problem knocked off the list with regards to my other thread...
https://www.clublexus.com/forums/ls4...s-to-half.html
You see, though my engine temperature never rises above half, my vehicle only begins to rough idle once the temperature reaches the half mark level. Therefore, I was wondering maybe my fan clutch is spinning too freely and not providing my 1UZ with the sufficient cooling it requires, consequently leading to the rough idle when too heated....Hence my question in post #1 what is the optimal cooling temperature of these 1UZ's.
But no need to fear. If I find 10,000 ways that doesn't work or solve my rough idling problem, I haven't failed. I am not discouraged, because every wrong attempt discarded is another step forward.
Thomas Edison is with me on this one guys.
1)what type of engine fan I have -- Hydro
2)Why my engine fan is "spinning too freely"-- Because its Hydro
Nevertheless, I will take the advice of LScowboy by having my Fan Fluid changed to the Dexron II or III transmission fluid since my current fluid in the engine fan reservoir has not been changed in 5 years. I will upload a picture of this fluid in the reservoir in the Morning.
Well I guess that clears my mind and I have another possible problem knocked off the list with regards to my other thread...
https://www.clublexus.com/forums/ls4...s-to-half.html
You see, though my engine temperature never rises above half, my vehicle only begins to rough idle once the temperature reaches the half mark level. Therefore, I was wondering maybe my fan clutch is spinning too freely and not providing my 1UZ with the sufficient cooling it requires, consequently leading to the rough idle when too heated....Hence my question in post #1 what is the optimal cooling temperature of these 1UZ's.
But no need to fear. If I find 10,000 ways that doesn't work or solve my rough idling problem, I haven't failed. I am not discouraged, because every wrong attempt discarded is another step forward.
Thomas Edison is with me on this one guys.
Regarding to the rough idle issue and others, I'd better not to mix different themes here and I will be reading your other threads and I will be posting if I can advise you any.
#33
Lexus Champion
wow, I never knew that all the Celsiors have the hydraulic fan system, very interesting! - I never saw it in USA except on SC300 and SC400 (Soarer)
the system has very expensive parts (10 times the parts cost to replace than a normal fan clutch) but I have heard that this system is quite reliable, and I can see how it would have some advantages over a traditional fan clutch, and the more I think about it, the fan spinning freely makes sense in this case.
I never realized there are such large differences in JDM vs. USA imported LS400
Is the hydraulic fan system known to have any leak prone areas, such as rubber hydraulic lines etc.? (I don't keep up with the unique aspects of JDM models or SC's as well as I should!)
the system has very expensive parts (10 times the parts cost to replace than a normal fan clutch) but I have heard that this system is quite reliable, and I can see how it would have some advantages over a traditional fan clutch, and the more I think about it, the fan spinning freely makes sense in this case.
I never realized there are such large differences in JDM vs. USA imported LS400
Is the hydraulic fan system known to have any leak prone areas, such as rubber hydraulic lines etc.? (I don't keep up with the unique aspects of JDM models or SC's as well as I should!)
#35
Moderator
wow, I never knew that all the Celsiors have the hydraulic fan system, very interesting! - I never saw it in USA except on SC300 and SC400 (Soarer)
the system has very expensive parts (10 times the parts cost to replace than a normal fan clutch) but I have heard that this system is quite reliable, and I can see how it would have some advantages over a traditional fan clutch, and the more I think about it, the fan spinning freely makes sense in this case.
I never realized there are such large differences in JDM vs. USA imported LS400
Is the hydraulic fan system known to have any leak prone areas, such as rubber hydraulic lines etc.? (I don't keep up with the unique aspects of JDM models or SC's as well as I should!)
the system has very expensive parts (10 times the parts cost to replace than a normal fan clutch) but I have heard that this system is quite reliable, and I can see how it would have some advantages over a traditional fan clutch, and the more I think about it, the fan spinning freely makes sense in this case.
I never realized there are such large differences in JDM vs. USA imported LS400
Is the hydraulic fan system known to have any leak prone areas, such as rubber hydraulic lines etc.? (I don't keep up with the unique aspects of JDM models or SC's as well as I should!)
I think the hydraulic cooling system used for a Celsior is quite reliable compared to the power steering system. Actually I have experienced the leaking oil from the power steering pump. I also think that the pressure is not as high as the power steering lines and this may be one of the reasons why the leak problem is not common.
The original drawing had Japanese parts names and I translated them.
#37
Pole Position
Thread Starter
Members,
After draining the fluid from my Hydraullic Fan set-up, I have noticed that the fluid was rather black. Seeing that this fan requires Dexron II fluid, I recon that this fluid has never been changed and as such has lost all viscosity .
I recon it is as a result of this loss in viscosity that is causing me to experience such loss in spinning power of my Hydraullic Fan.
Can anyone advise me how to properly flush this Hydraullic System ?
#38
Lexus Champion
I advised you or someone on this months ago, but here is it again - it is exactly as you would flush and bleed the power steering system, that's basically what the hydraulic portion is, just driving a fan rather than a rack
just draining the system at one of the cooler ends and refilling with fresh dexron III ATF would be fine for a drain and fill, or else for a true flush, you need to disconnect the drivers side cooler line at the cooler outlet (pump inlet) and stick that hose into a large container (such as a 5QT) bottle of fresh new Dexron and run the system letting it suck the fluid out of the new gallon until the discharge out of the cooler runs a pretty red
just draining the system at one of the cooler ends and refilling with fresh dexron III ATF would be fine for a drain and fill, or else for a true flush, you need to disconnect the drivers side cooler line at the cooler outlet (pump inlet) and stick that hose into a large container (such as a 5QT) bottle of fresh new Dexron and run the system letting it suck the fluid out of the new gallon until the discharge out of the cooler runs a pretty red
#39
Pole Position
Thread Starter
I advised you or someone on this months ago, but here is it again - it is exactly as you would flush and bleed the power steering system, that's basically what the hydraulic portion is, just driving a fan rather than a rack
just draining the system at one of the cooler ends and refilling with fresh dexron III ATF would be fine for a drain and fill, or else for a true flush, you need to disconnect the drivers side cooler line at the cooler outlet (pump inlet) and stick that hose into a large container (such as a 5QT) bottle of fresh new Dexron and run the system letting it suck the fluid out of the new gallon until the discharge out of the cooler runs a pretty red
just draining the system at one of the cooler ends and refilling with fresh dexron III ATF would be fine for a drain and fill, or else for a true flush, you need to disconnect the drivers side cooler line at the cooler outlet (pump inlet) and stick that hose into a large container (such as a 5QT) bottle of fresh new Dexron and run the system letting it suck the fluid out of the new gallon until the discharge out of the cooler runs a pretty red
However, the fan is still spinning too freely. I think this Hydro Fan needs to be changed !
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