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LamSV

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About LamSV

  • Birthday 06/05/1959

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  • First Name
    Doris

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  • Gender
    Male
  • Lexus Model
    LS400
  • Lexus Year
    1994
  • Location
    Texas (TX)

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  1. Hello Blessed, Not sure if you find my post too late. I had a 1994 LS400. Last weekend (long July 4th holidays), I did some retrofit on my radiator fan and I found the outcome very satisfying (at least for me). My radiator fan (driven by the drive belt) was making a lot of noise when I accelerate (any RPM higher than 2,000). The sound was like a Concorde taking off. It was so embarrasing for an otherwise "silent" Lexus!!! My fan clutch was not working properly (wear and tear) after 9 long years. However there are so much redundancies in a Lexus (thanks to the great Lexus engineers). There are 2 additional electric fans on the front of the radiator. In my humble opinion, I do not think the radiator fan (with clutch) is really useful to me at this point. Even when new, it will continue to generate noise, drain power from the engine and eventually will fail again because of its mechanical principle. This is what I did (you can disagree). I completely removed the radiator fan assembly (4 nuts). I used spacers (4 nuts) and the original nuts to tighten the fan pulley back in place. This is absolutely critical - you must ensure that the fan pulley is well tightened, otherwise it will wobble and damage your engine. If you are not sure of what I am talking about here, please go and get a trusted mechanic to do this for you. I modified (actually very very simple) the electric fans logical circuit. Now my two fans will turn on in Low Speed when I start the car, regardless of the AC on/off condition (original design). The High Speed will be activated when the coolant temperature reaches its preset high point (this is the original design, I did not touch this part). I have no time to explain this simple modification here but all I wanted to say is that I did not add or delete any existing Lexus wiring. I did not use any special tools or gadgets, just some reliable Craftsman (Made in USA) tools. How is the "new" driving experience? Well, you need to remember that I live in Houston Texas and temperatures are anywhere from 80F to 100F. So far, my coolant temperature indicator (on the dash console) is still showing the middle mark, just like before. So far, I have not seen the 2 electric fans being kicked in at High Speed (meaning that the coolant temperature is not high to need that extra ventilation). But the most wonderful experience is that I feel my LS400 gaining some additional Horse Power!!! There is the extra quick (tiny weeeny bit more) acceleration, extra responsiveness and certainly my LS400 is quieter (more) than before.
  2. Hello Zephyr, Please remember that I am using my 1994 LS400 as a reference in answering your "desperation". My problem - the speedometer (always zero), cruise control (no control) and odometer (not counting up) all went dead at the same time. My O/D OFF light flashed intermittently (as it should to indicate a speed pickup failure). I did not have the Check Engine light on situation (not sure why the ES300 has this indication). My diagnosis - I also replaced the Vehicle Speed Sensor No.1 but this did not solve the problem. However when I took a closer look at the plastic gear (metal shaft with plastic gear) which interfaced with the VSS No.1, I noticed that the plastic gear teeth were worn out. Because the teeth were worn out, they were not engaging the transmission. Consequently, the gear was not spinning as it should. And so my VSS No.1 could not pick up the speed. Hence the speedometer was still stuck at zero. My solution - Replaced old with a new plastic gear. Made sure plastic gear was free from any oil so that it would not slip whilst it engaged with the transmission. However I did oil the O ring with ATF oil to give it a tighter seal. This works with my 1994 LS400.
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