Overheating Issues

[alicnorr8]

What kind of radiator did you put in? There are multiple different fan clutches available - where was it gotten from? Do you hear the fan roaring when it's overheating? My fan, with a new clutch will start roaring in stop-go traffic.

It was a custom built aluminum rad, after springing leaks in two different repaired OEM copper ones... From a local place here. They've since openend it up and checked to make sure it wasn't clogged. The fan clutch seems to be kicking in when hot... We've even gotten a separate new one to try, thinking the first new might be faulty, and still overheating. Both were Aisin brand

 

[alicnorr8]

https://forum.ih8mud.com/threads/fj62-docu-series-thread.1276319/page-2#post-15071997

Modding the 3FE 80 series fan clutch made a huge difference for me. Summer days here are routinely 115-120f, have never overheated.

It seems we might have a different style fan clutch? I don't think we have that screw to modify the position.. screenshot is the type I have, with the little coil bit on the front

 

[Spike Strip]

Yes, that is the stock Fan Clutch 16210-61121 = Aisin FCT-017 Stock spec for FJ60/62 with 2F or 3F USA or General Markets. Referred to as the 'Red' hub FC.

However, there are more robust Fan Clutch from other Land Cruiser models, as well as other Toyota Truck models that fit and work and kick in at a lower temp.

People here sometimes install an 80-series Fan Clutch referred to as the 'Blue Hub'.... There's also an 'Aqua' hub which is a different hue of blue. There are many threads on this here and in the 80-section. All these Fan Clutches have different Thermal Profiles and in a properly functioning system, the Red Hub clutch should work fine.

I personally like the 'Black Hub' version from the T100 HD Truck = Aisin FCT-009

Are you sure the new Thermostat is installed correctly with all gaskets including the top rubber gasket? OEM Thermostat? 82*C or 90*C ?

*** Is your truck only over-heating in traffic or also when on the road at speed ?

 

[CruiserTrash]

Yes, that is the stock Fan Clutch 16210-61121 = Aisin FCT-017 Stock spec for FJ60/62 with 2F or 3F USA or General Markets. Referred to as the 'Red' hub FC.

However, there are more robust Fan Clutch from other Land Cruiser models, as well as other Toyota Truck models that fit and work and kick in at a lower temp.

People here sometimes install an 80-series Fan Clutch referred to as the 'Blue Hub'.... There's also an 'Aqua' hub which is a different hue of blue. There are many threads on this here and in the 80-section. All these Fan Clutches have different Thermal Profiles and in a properly functioning system, the Red Hub clutch should work fine.

I personally like the 'Black Hub' version from the T100 HD Truck = Aisin FCT-009

Are you sure the new Thermostat is installed correctly with all gaskets including the top rubber gasket? OEM Thermostat? 82*C or 90*C ?

*** Is your truck only over-heating in traffic or also when on the road at speed ?

To support this, I've run both aqua and black clutches and they both work great. With a good radiator, water pump, and a good function and clean system, I can pull up steep miles-long mountain passes on I-70 going 50-60mph (pedal to the floor obviously haha) here in Colorado and the real temp gauge (aftermarket) that I have doesn't budge from the 195-200*F range.

 

[Lead Head]

It was a custom built aluminum rad, after springing leaks in two different repaired OEM copper ones... From a local place here. They've since openend it up and checked to make sure it wasn't clogged. The fan clutch seems to be kicking in when hot... We've even gotten a separate new one to try, thinking the first new might be faulty, and still overheating. Both were Aisin brand

You should know if the fan clutch kicks in. If you are hot, it will be screaming at anything above 2,000 RPM.

Your fan shroud is in place, right? Do you have a termometer or temperature probe you can stick in the radiator?

 

[toy_tek]

It seems we might have a different style fan clutch? I don't think we have that screw to modify the position.. screenshot is the type I have, with the little coil bit on the front

Green hub Aisin FTC-049 for the 80 series 3FE. Red hub is stock for the 89 fj62.

 

[alicnorr8]

Yes, that is the stock Fan Clutch 16210-61121 = Aisin FCT-017 Stock spec for FJ60/62 with 2F or 3F USA or General Markets. Referred to as the 'Red' hub FC.

However, there are more robust Fan Clutch from other Land Cruiser models, as well as other Toyota Truck models that fit and work and kick in at a lower temp.

People here sometimes install an 80-series Fan Clutch referred to as the 'Blue Hub'.... There's also an 'Aqua' hub which is a different hue of blue. There are many threads on this here and in the 80-section. All these Fan Clutches have different Thermal Profiles and in a properly functioning system, the Red Hub clutch should work fine.

I personally like the 'Black Hub' version from the T100 HD Truck = Aisin FCT-009

Are you sure the new Thermostat is installed correctly with all gaskets including the top rubber gasket? OEM Thermostat? 82*C or 90*C ?

*** Is your truck only over-heating in traffic or also when on the road at speed ?

Thanks for the tips, I'll give a look and see if I can find any one these other clutches in stock at my normal part stores here. It overheats only in heavy traffic and while sitting at red lights, once it's up to highway speed the temp drops right back down to normal. I did buy new gaskets for the new thermostat when it was dropped in - the top rubber one and square-ish paper one. It was the OEM part number for this model, but can't remember what the operating temp is off the top of my head.

 

[alicnorr8]

You should know if the fan clutch kicks in. If you are hot, it will be screaming at anything above 2,000 RPM.

Your fan shroud is in place, right? Do you have a termometer or temperature probe you can stick in the radiator?

The fan shroud is in place, and it's a b to work around but definitely haven't removed it. I don't have a temp probe, only the handheld laser type.

 

[toy_tek]

It seems we might have a different style fan clutch? I don't think we have that screw to modify the position.. screenshot is the type I have, with the little coil bit on the front

I just re-read your response. To be clear, the screw adjustment on the green hub is internal. Need to split open the clutch to do it - and also change/fill the oil. The stock red hub does not have the internal positioning adjustment capability.

 

[Spike Strip]

@toy_tek

What viscosity oil did you use for refill?

 

[toy_tek]

@toy_tek
What viscosity oil did you use for refill?

Straight 20 CST - but IMO that’s probably too heavy for anyone not in the desert. More details in that post link above.

 

[Lead Head]

Thanks for the tips, I'll give a look and see if I can find any one these other clutches in stock at my normal part stores here. It overheats only in heavy traffic and while sitting at red lights, once it's up to highway speed the temp drops right back down to normal. I did buy new gaskets for the new thermostat when it was dropped in - the top rubber one and square-ish paper one. It was the OEM part number for this model, but can't remember what the operating temp is off the top of my head.

It really sounds like your fan clutch isn't engaging. I really can't iterate again how loud the fan is with it engaged. It absolutely screams. I bought a new red clutch for a FJ62, and it will start to engage when the engine is fully warm just in park.

 

[John McVicker]

@Spike Strip @CruiserTrash just to be sure before I order: the black Aisin FCT 009 will work for a 1985 2f?

I’m currently running a series 80 Blue Hub Fan for the last several years, which has been fine. However, I live in the mountains & if you guys believe the FCT 009 will give even better performance I will consider purchase.

 

[Lead Head]

@Spike Strip @CruiserTrash just to be sure before I order: the black Aisin FCT 009 will work for a 1985 2f?

I’m currently running a series 80 Blue Hub Fan for the last several years, which has been fine. However, I live in the mountains & if you guys believe the FCT 009 will give even better performance I will consider purchase.

Remember, the fan can never cool more than the thermostat. If your temperature gauge is stable even pulling mountain grades, then there will ne no benefit.

Sometimes an overly agressive fan clutch can be a detriment. They make a lot of noise and suck down a lot of power. A mechanical fan fully engaged can easily consume 10 HP at high RPM, and when you only have 110-150 HP to give.....

 

[Spike Strip]

@Spike Strip @CruiserTrash just to be sure before I order: the black Aisin FCT 009 will work for a 1985 2f?

I’m currently running a series 80 Blue Hub Fan for the last several years, which has been fine. However, I live in the mountains & if you guys believe the FCT 009 will give even better performance I will consider purchase.

If you're already running a Blue Hub and it's working fine, there's really no reason to change. The FCT-009 is what some MUD vendors sold as a 'Heavy Duty' Fan Clutch for '76 -'89 2F/3F/3FE but I don't know if it's much different from the 3FE Blue/Green FC, which is also 'heavy duty'. (LINK) All of these clutches will engage between 170* -200* F and since you're at elevation, probably unnecessary.

If you were over-heating then you might want to swap, but remember, the function of the FC is to draw air thru the Radiator/condenser at idle or low speeds. Even the stock red-hub FC works just fine with a properly functioning cooling system under very rigorous conditions. It's what I used in a stock 5/85 system in the Calif desert during summer months and it was fine. The FCT-017 (16210-61121) Red-Hub FC is also stock on 2F/3F engines in the Middle East.

For the 3F on a 70-series there's a different part number, though the hub is still 'RED', but seems like a different hue, to me.

HTH

 

[John McVicker]

Thanks @Spike Strip And that link to RedLine is good to have.

Yeah, my Blue Hub is working good so I will stay ‘as is’ for now but this is good information to have.

 

[Spike Strip]

@toy_tek

Are you running the stock FJ60/62 Fan Blade (FNT-022)? The 7-blade one? (it's 450mm).

I'm only asking because the Fan Blade for the FCT-049 and other ME Fan Clutches (for 80-series and 70-series) is an 8-blade unit (FNT-018) but I can't find exact dimensions to see if it will fit in the stock FJ60/62 Fan Shroud.

I don't know if the 3FE in an 80-series has a larger Fan Shroud.

Cheers.

 

[toy_tek]

@Spike Strip good questions. I just have the factory fan.

 

[CruiserTrash]

Thanks @Spike Strip And that link to RedLine is good to have.

Yeah, my Blue Hub is working good so I will stay ‘as is’ for now but this is good information to have.

I agree with Spike, John. I’ve used both the blue (or was it aqua?) and the black at various times and haven’t noticed any difference between them. As long as I keep my system in good order, my truck stays rock solid under 200 pull up to the Eisenhower Tunnel, Vail Pass, Monarch Pass, etc. I’m like you and have a heavy truck with lots of doodads - no problems.

 

[alicnorr8]

I agree with Spike, John. I’ve used both the blue (or was it aqua?) and the black at various times and haven’t noticed any difference between them. As long as I keep my system in good order, my truck stays rock solid under 200 pull up to the Eisenhower Tunnel, Vail Pass, Monarch Pass, etc. I’m like you and have a heavy truck with lots of doodads - no problems.

Do y'all know the Aisin part numbers for the blue and aqua hubs? Finding the black hub here is proving difficult..