Unique Over Heating Issue, 1992 es300
#18
Lexus Fanatic
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I tried to replace my radiator cap with an OEM Nippon Denso and even ordered it from the Lexus dealer. But when it came in, it would not fit. Just a little too small and the spring is not even close to the same. I took the old one in and showed the parts manager the differences. He tried and tried but could not find any other part number. I had to return it. Still looking. I dont know if someone changed the radiator to something different and now the cap with my VIN does not match? It's a mystery.
akab, do you have an OEM p/n for the radiator cap?
akab, do you have an OEM p/n for the radiator cap?
Radiator Cap 16401-62100
Radiator Cap COVER 16545-62011 this is a plastic cap that clips over top the radiator cap
Inlet Cap 16401-62090
If the radiator cap does not fit, then the radiator is not the same as OEM. You can set the hydraulic fan to run at high speed by using a jumper (see image). Failure points are the hydraulic solenoid on the power steering pump (also the connector), clogged filter, bad ECU, bad hydraulic fan (very unlikely for the last two).
![Unique Over Heating Issue, 1992 es300-pwc7b.png](https://www.clublexus.com/forums/attachments/es-1st-to-4th-gen-1990-2006/486220d1683166606t-unique-over-heating-issue-1992-es300-pwc7b.png)
#19
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Thanks Lexus2000. You are quite right about the radiator. Some additional checking under the hood revealed that the radiator is a "Radicon" brand (made in Taiwan) so the original was changed by a previous owner. The inlet cap actually fits this radiator. So, mystery solved. I got a second-class radiator. Happy days. ;-)
#20
Lexus Fanatic
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Put an OEM inlet cap on the radiator, then bleed the cooling system with a spill free funnel. But before you go there, install the jumper to make sure the fan system is working correctly. If it spins at high speed, it probably is.
....wait scratch that, the inlet cap has two check valves that will not work properly. Best to bite the bullet and replace the rad. But do the jumper thing first!
....wait scratch that, the inlet cap has two check valves that will not work properly. Best to bite the bullet and replace the rad. But do the jumper thing first!
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