lenore

Well at 277k miles today, Best automobile I have every owned. Yea, normal stuff like shocks, timing belts, and a couple of radiators. Cooling fan motors etc. but everything works. That to me is an example of great bones in an old car. smooth, and powerful, with a great ride.

Took it in to my favorite mechanic and they vacuumed and pressure tested the system for 30 minutes. No leaks. Than put dye and new oil in and eventually the R134A. System came back up and my issue of warm air on drivers side is gone. Nice cool AC in our 103 temp today. Will monitor to see if I have any leaks. The system has never been opened in 16 years of ownership.

Started troubleshooting my 2008 RX400h with 277K miles today for drivers side air vents not cooling during AC mode. Right side appears to be cold. Took lower dash apart and checked servo motors out. all function well. Even when I manually operated air temp control valve on drivers side still no cooling. Did some research and apparently when AC freon is low, this can happen. Completely against my logic troubleshooting since the right side seems normal. Next step to check charge in the air conditioning system. First time I have experienced this since I purchased the vehicle. Any thoughts? I tried changing mode switch, but nothing seems to be getting the results of cold air out of drivers vents.?????

Our Lexus has 270k miles and have never experienced what you have. Fuel in the United States is usually fairly clean and I dont understand why your filter would be clogged unless somebody tampered with the fuel. You are the first one I have ever heard of having a fuel filter issue on the RX SUV. Usually the filter in the tank is nothing more than a screen. You should be able to take rear seat out and get to access cover. The bolts for seat are infront and the rears can be accessed through trunk area. Good luck

What code did they give you and did the car run?

I would look at a junk yard, Does not have to be a Lexus, maybe a Toyota Highlander and obtain the line.

Great job, I have done this twice on my RX400h and once on a RX300. Raising the engine a little is the key. On thing i do is remove the torque strut mount on top of engine to allow free movement.

I can add that the front control arms are a real pain to replace. The labor seems a little high. For a do it yourself, the control arms are less than $100 apiece from places like RockAuto. The Strut mounts are around $85 apiece. The best struts for Replacement are KYB. Our RX400h has had all of this replaced once, however the Control arms bushings crack because of design and I have replaced them twice at 267K miles. I find this kind of work not fun anymore as I get older. But saving money drives me to things I have always done.

The Toyota fan blade would not fit

You need to get any codes read. That is your first step.

Maybe put a floor jack under strut and raise it up and down see if it changes.

Appears your upper strut mount is not right. Are the struts on right side of car.? I seem to remember that AWD and FWD have different strut numbers.

Just Feedback, the cooling fans are working great since replacement, no issues

We have 263k miles, Everything working fine. Had to replace front Control Arms for broken bushings. Other than that everything routine maintenance. I do now have a oil leak from rear valve cover (sucks) I have to remove intake manifold to get to it.. Best auto I have ever owned in over 50 years. On original hybrid batteries. I have provided all maintenance since purchase.

I have replaced the bearings on the front hubs, I just ordered from Rockauto for the rear hubs with bearings.

I am not sure about that starter, but the Denso starter in other Lexus models have a rotating contact in the relay mounted on starter. They get burned. when it starts sometime, and not other times the contact is moving to a better spot. This relay (which is mounted on the starter) can be repaired with a Denso starter relay contact kit. The only issue on your car is that it is buried under the intake on back of engine. The kit cost less than $20.

Wow, what a find....

Yes I know, but family, downsizing house, and not looking forward to job interfered till I could get plugs changed. Runs fantastic now. Control Arms next, this will be second set.

update, now at 249k miles. Just changed the rear three spark plugs, yup they were original. also replaced coil on those cylinders as you have to remove intake manifold to replace the plugs. two days ago replaced the radiator cooling fans with a TYC fan assembly saving big bucks. Other than car needing new lower control arms it runs great.

I am now at 249k miles on my fantastic RX400h. One of the issues that shows at that mileage are the cooling fans on the radiator failing mechanically. The motor shafts were actually wobbling. Those motors are quite expensive at $200 apiece, total of over $400 for motors. On the other Lexus site a gentleman came up with TYC radiator cooling fan assembly that had motors that could be take off a Toyota Highlander Hybrid 2008 that fit our different shroud assembly. I did this last night and it was a direct fit, including the plugs and harness. Just remove assembly and take fan blades off and remove motors. Here is the final good news, the whole Highlander assembly cost $139 at your favorite site ie Amazon or Rockauto. The shroud from the highlander will not work in our cars as it does not have the expansion tank. You use only the motors and our old fan blades. Top of the morning to everyone.

Well, records are important. I bought my RX400h hybrid in 2010 with 80k miles. It has been the best automobile I have ever owned. We now have 248k miles and other than normal maintenance and one hybrid cooling pump failure early on it has been spectacular. Cant help you on 450H, but I hated the joy stick on early models....

First welcome aboard, who did the timing belt.? Maybe it was not done properly.

Could be defective tire. Have you rotated tires to see if there is a change?

You may have a bad wheel bearing, can you hear a rumble or whining noise when driving.?