Radiators - Koyo vs The REST

You're the man. I didn't think there were any of these still in inventory stateside. Overpaying? That price is a steal IMO. Let them laugh.

2001-2002 Toyota 4Runner Radiator Assembly 16400-75181 | Toyota Parts Center

Any idea why that part number returns: This part does not fit your 2000 Toyota 4Runner and redirects to the plasticy Denso unit? Can't see why a 2001-2002 would be different but then I didn't read the thread and apologize in advance if there is a reason I missed.

Maybe that glitch allowed them to remain in inventory.....
 
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2001-2002 Toyota 4Runner Radiator Assembly 16400-75181 | Toyota Parts Center

Any idea why that part number returns: This part does not fit your 2000 Toyota 4Runner and redirects to the plasticy Denso unit? Can't see why a 2001-2002 would be different but then I didn't read the thread and apologize in advance if there is a reason I missed.

Maybe that glitch allowed them to remain in inventory.....


I mentioned this to one of the managers I talked to and he said its because that is the Original part and the "AZ" Part was added more recently so the system thinks it supersedes the original. He said it is just the way the system works but that the 16400-75181 is the good one.
Also he said they still get shipments of them from Japan so I am inclined to believe they still make them and not that there is just old units sitting around waiting to be sold through.
 
I mentioned this to one of the managers I talked to and he said its because that is the Original part and the "AZ" Part was added more recently so the system thinks it supersedes the original. He said it is just the way the system works but that the 16400-75181 is the good one.
Also he said they still get shipments of them from Japan so I am inclined to believe they still make them and not that there is just old units sitting around waiting to be sold through.

Interesting. These are the OEM metal top-tank units? I probably would have gone that route had I known, but I got the cheap plastic cousin for 1/3 the price. I never try to cut corners on my rig, though. Good to know and thanks for sharing the info!
 
I put an aluminum (Champion) and I'm happy with it. Sure it costs more up front, but it will NEVER corrode, develop tiny cracks like plastic ones, or fail in the typical plastic/aluminum issues. Plus...it's all shiny and that's a plus

Did it show up in good condition?
 
2001-2002 Toyota 4Runner Radiator Assembly 16400-75181 | Toyota Parts Center

Any idea why that part number returns: This part does not fit your 2000 Toyota 4Runner and redirects to the plasticy Denso unit? Can't see why a 2001-2002 would be different but then I didn't read the thread and apologize in advance if there is a reason I missed.

Maybe that glitch allowed them to remain in inventory.....

It will fit. BTW, it is also plastic, just much better quality plastic.
 
Been running Denso radiator bought off Amazon for going on 2years no issues

Yeah I'm fine with the Denso - cheap milkshake insurance for the 235k factory radiator. The factory radiator is still nice and I kept it as a backup. Just can't risk trusting it on an every day driver.
 
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Hey everyone
New here, been checking the forum out for a while though.
Finally getting my 2000 limited going again
It has 300k. Just bought new oem radiator online and a transmission cooler to bypass. Radiator will be in today however trans cooler next week. Should I wait and do both at same time?
I’m not sure if I can wait another week. Lol
 
I would wait depending on how you mount the cooler, I used the style mounts that go through the condenser and to gain access I had to pull the radiator back. It can be done without removing the radiator, but if it's only a week i'd wait.
 
I purchased the champion radiator that has a built in trans cooler. I unfortunately wasn't able to find out if the built in cooler had plastic components which fail on the Oe radiator. so far I haven't noticed significant gains as far as temp goes I average about 195 on the scan gauge which is what I was at before, the temp does stay lower at low speeds when off-roading but it's negligible. This radiator also isn't exactly plug and play, it does require some small modifications here and there. I currently have my trans lines going through both the radiator and my B&M external cooler and those temp have too remained the same. at this point it looks cool I don't have any issues with it. id suggest sticking with a new OE radiator and run the trans cooler until maybe 100k miles and switch back to external cooler or change the radiator again to avoid pink milkshake.

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Thanks guys. I just installed the radiator. Keeping b&m for later. Going to add as an additional cooler. Ordered scanguage 2 that will be here early next week.
Really excited getting her on the road again.
 
Here's a post Covid update. Needed a radiator for my 1998 Limited. It has the original radiator with 260k on it. The cooling system has been well maintained with frequent red coolant changes, so when I bought it in 2017 the radiator looked pretty good. Few years later, and now it looks all brown. Time for a new one.

Tried ordering a Taiwan OEM - either the dealer will not ship or they say it is discontinued.

Tried ordering a Taiwan Denso - Amazon says it will ship in 3-4 weeks. I tried buying one from Home Depot and they cancelled the order because it it on backorder. On another one of my 4Runners, I had one of these last about 3.5 years before it started leaking after a coolant flush. I had to get three different replacement ones shipped to me because they kept arriving damaged. Either fin damage or overflow neck damage caused by the garbage packaging. I finally received one that was packaged well, and it was made in China. It still works completely fine 4 years later.

This brought me to the Koyo. $175 shipped from Rock Auto and it was at my door step in one day. First impression is very good. Packaging is excellent and the product feels higher quality than the Taiwan/China Denso. It also more closely resembles a Japanese Denso radiator, down to the same type of drain valve. It is still made in Indonesia as of 2022. Time will tell how this holds up compared to the Denso.
 
Here's a post Covid update. Needed a radiator for my 1998 Limited. It has the original radiator with 260k on it. The cooling system has been well maintained with frequent red coolant changes, so when I bought it in 2017 the radiator looked pretty good. Few years later, and now it looks all brown. Time for a new one.

Tried ordering a Taiwan OEM - either the dealer will not ship or they say it is discontinued.

Tried ordering a Taiwan Denso - Amazon says it will ship in 3-4 weeks. I tried buying one from Home Depot and they cancelled the order because it it on backorder. On another one of my 4Runners, I had one of these last about 3.5 years before it started leaking after a coolant flush. I had to get three different replacement ones shipped to me because they kept arriving damaged. Either fin damage or overflow neck damage caused by the garbage packaging. I finally received one that was packaged well, and it was made in China. It still works completely fine 4 years later.

This brought me to the Koyo. $175 shipped from Rock Auto and it was at my door step in one day. First impression is very good. Packaging is excellent and the product feels higher quality than the Taiwan/China Denso. It also more closely resembles a Japanese Denso radiator, down to the same type of drain valve. It is still made in Indonesia as of 2022. Time will tell how this holds up compared to the Denso.

Just a two year update. Radiator still looks good. No leaks to report, nor has the plastic exhibited any heat related wear after two years and 20k miles. I am also utilizing the ATF cooler. I think a 10 year replacement interval is the way to go.
 
I decided a while back to try out a Koyo aluminum radiator and it improved the cooling for my engine. My 98 is very heavy with bumpers, skid plates and a roof rack and the engine struggles especially in the mountains. I have regeared the differentials but it didn't help all that much. After replacing the OEM style radiator with the Koyo aluminum radiator, my coolant temps improved quite a bit.

The caveat with the Koyo radiator is it does not have an automatic transmission cooler in it, so if you have an auto trans, you have to run an external trans cooler. I have a large Hayden 699 cooler that does a great job keeping my trans temps down. Running a stand-alone trans cooler takes away the chance of a trans cooler failure inside the radiator which ends up destroying the transmission because the ATF and engine coolant were allowed to mix and that mixture made it into the transmission. Auto transmissions due not do well when contaminated with coolant.

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