Unique Over Heating Issue, 1992 es300

Reply Subscribe

Thread Tools

Search this Thread

08-16-12, 04:10 PM

#16

GrayES300

Rookie

Join Date: Aug 2009

Location: WI

Posts: 48

Likes: 0

Received 0 Likes on 0 Posts

Isn't the fan run off hydrolics from power steering pump? Don't think you can make it spin faster. I had exact symptoms you have on a 92 and it was a head gasket.

Reply Like

08-16-12, 04:31 PM

#17

Bdub215

Lead Lap

iTrader: (1)

Join Date: May 2008

Location: Cheltenham, Pennsylvania

Posts: 641

Likes: 2

Received 12 Likes on 10 Posts

Quote:

Originally Posted by GrayES300

Isn't the fan run off hydrolics from power steering pump? Don't think you can make it spin faster. I had exact symptoms you have on a 92 and it was a head gasket.

except that you can. Over by the Rack theres a small connector for the Progressive power steering. Unplug it and your steering gets hard (i happen to like it this firm) but your fan speed also speeds up. This fan can hum at full speed.

Reply Like

08-16-12, 05:43 PM

#18

LeX2K

Lexus Fanatic

Join Date: Sep 2010

Location: Alberta

Posts: 20,344

Likes: 1,538

Received 2,978 Likes on 2,506 Posts

Quote:

Originally Posted by randal

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?

Here are the part numbers -

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

Reply Like

08-16-12, 07:06 PM

#19

randal

Lead Lap

Join Date: Nov 2009

Location: IN

Posts: 486

Likes: 0

Received 3 Likes on 3 Posts

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. ;-)

Reply Like

08-16-12, 07:17 PM

#20

LeX2K

Lexus Fanatic

Join Date: Sep 2010

Location: Alberta

Posts: 20,344

Likes: 1,538

Received 2,978 Likes on 2,506 Posts

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!

Reply Like