FJ62's Overheating. Several of us don't know why.

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I don't remember the color but I remember it being strange that it was a sticker and wasn't in the casting itself. I'm going to order an FCT-049 and compare them.
 
tornadoalleycruiser said:
What is the difference between FCT-049 and FCT-017? I have a new FCT-017 and potential overheating issues. and I have not driven it enough to hear the roar, it overheated on the maiden voyage but that might have been user error and a burping issue.

Update. And Went ahead and ordered the FCT-049. Did some searches. Haven't heard the FCT-017 spool up yet. I can possibly take apart the FCT-017 and use my RC shock oil and try a different viscosity later.
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Where did you order it from?
 
It should be blatantly obvious if your fan clutch is engaging. The OEM Aisin fan clutches will nearly free-wheel when the engine doesn't need cooling, but when they heat up, they engage HARD. The fan absolutely roars. I have a magnaflow muffler on my 62 (not a particularly loud muffler), and if you rev the engine to ~2,500-3,000 RPM the fan is FAR louder than the exhaust.

Here's a good video demonstrating how loud a mechanical fan can get when locked up:

If you're hitting 230-240*F and the fan isn't that loud - then either your radiator is plugged or your fan clutch is bad.
 
Lead Head said:
It should be blatantly obvious if your fan clutch is engaging. The OEM Aisin fan clutches will nearly free-wheel when the engine doesn't need cooling, but when they heat up, they engage HARD. The fan absolutely roars. I have a magnaflow muffler on my 62 (not a particularly loud muffler), and if you rev the engine to ~2,500-3,000 RPM the fan is FAR louder than the exhaust.

Here's a good video demonstrating how loud a mechanical fan can get when locked up:

If you're hitting 230-240*F and the fan isn't that loud - then either your radiator is plugged or your fan clutch is bad.
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Wow, mine has never done that. New fan clutch it is! I'm feeling pretty good about this!
 
Alright, I just ordered the FCT-049 fan clutch from partsgeek to avoid Amazon. Should have it by next week sometime. Fingers crossed! 🤞
 
My new fan clutch came in. This thing is big! I'm planning on installing it tomorrow along with the new radiator. Wish me luck! 🤞
 
Mine is sitting on the shop floor. It is large compared to FCT-017. Headed 4wheeling with some friends tomorrow morning for a few days, hope to get to my fan clutch mid October. Will also be revising my radiator shroud. My install may be a bit more labor intensive. Hope it fixes your heat issues.
 
tornadoalleycruiser said:
Mine is sitting on the shop floor. It is large compared to FCT-017. Headed 4wheeling with some friends tomorrow morning for a few days, hope to get to my fan clutch mid October. Will also be revising my radiator shroud. My install may be a bit more labor intensive. Hope it fixes your heat issues.
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That fan shroud mod is wonderful! I can’t twll you HOW glad I am that I took the time to cut that thing in half. It saves your ass next time you have to get in there and change or tighten a hose.
 
cps432 said:
That fan shroud mod is wonderful! I can’t twll you HOW glad I am that I took the time to cut that thing in half. It saves your ass next time you have to get in there and change or tighten a hose.
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Oooh!!! Just read about that! Seems like a great mod! I think I might go that route as well :)
 
CruisD64 said:
Ran outta sunlight. Gonna have to wait until tomorrow or this weekend to see the results. Stay tuned!
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She's fixed! Hottest I hit was 191 on my test drive! FCT-049 for the win!
 
pithicus said:
Cool! is the roar louder?
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There is an actual roar now. Wasn't before. I've been drinking jack and cokes and just watching the fan clutch engage all while laughing. I am beyond happy AND I found I'm going to be an uncle again today! Perfect day!
 
CruisD64 said:
There is an actual roar now. Wasn't before. I've been drinking jack and cokes and just watching the fan clutch engage all while laughing. I am beyond happy AND I found I'm going to be an uncle again today! Perfect day!
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Great news and even better news!!! ...🥃🥃
 
Ah. I thought I updated this thread. A few months later and the cruiser is doing great. I've driven it from Truckee to the Bay Area a few times already and the temps never exceeded 195. I'm guessing that's when the fan clutch kicks in? I never hear it over the sound of my music but I'm happy. It's at the point now where I'm almost used to not looking at the temp gauge constantly. Truly a joyful experience every time I drive it. :) Still glad I did the Thermocure becuase it did remove a ton of crap but I'm pretty sure the fan clutch and aluminum radiator did most of the work. Now onto the engine in my 77 FJ40. THAT has a ton of rust in it as it was never drained and sat for 20 years. Hopefully I'll be able to get that sorted.
 
If you have added lift and/or bigger tires, then you need to make sure you are running the proper gears for your setup.
 
jhanger said:
If you have added lift and/or bigger tires, then you need to make sure you are running the proper gears for your setup.
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Yeah. That's the eventual plan. I'll be running 4.88's with ARB's once I have the money.
 
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