Djlai

Lbinh, I was just being more specific to the actual part because it may cause some confusion and the user may only replace the fluid. layne

LBINH posted-FYI...The rad. fan is propelled by your power steering fluid This is not true, fan is propelled using Power Steering Pump.

Your problem may be that your power steering pump may be going bad or leaking.Your probably asking yourself what does the power steering pump have to do with the cooling system. Strangely enough Lexus has the power steering pump and your cooling fan connected together. My return hose on my power steering pump was leaking and it was causing the fan to not spin fast enough to cool my car down, therefore the temp gauge would fluctuate, but not overheat. Usually the gauge would rise when I am driving at low speeds or stopped and the gauge would go down when driving at high speeds. I replaced the thermostat, radiator cap, water pump, heads inspected for crack head, and a rebuilt power steering pump. To check for leaks locate your power steering pump and make sure its not leaking. If it is not leaking then the problem is most likely with the hoses. I ended up having to replace my return hose which cost 100 bucks and only Lexus sells it. Layne To get rid of that white smoke replace your valve seals and adjust them while your at it.

when we Drained the system we totally flushed it out with water making sure there was nothing left of the other coolant. I took the thermostat out when draining the system and just ran a water hose thru it until nothing but water came out. I am leaning towards your other recomendations that it has something to do with the fan because this problem existed before I did the coolant change. When I first noticed the problem coolant was spewing out of the reserve tank and I had it check for head gasket problem but the mechanic said it was fine. So I replaced the thermostat thinking it was a stuck thermostat and that didnt fix it. So I went ahead and changed the water pump and Radiator cap. After doing that the water quit spewing out of the reserve tank but the temp gauge still keeps fluctuating. My old radiator cap was bad so I guess that fixed the problem with the reserve tank spewing. I notice though when I first start the car my fan comes on at a really low speed and I can grab it with my hand and stop it. I dont know if thats normal. I will check today if my fan comes on fast when It gets hotter though. Also you guys mentioned the coolant sensor temp and I will get that checked out as well using an ohmmeter.

Hello, Im sorry for not mentioning the color of the coolant. I did use at one point the Orange coolant but when I drained the car again after acting up and replacing the thermostat the coolant was getting expensive to keep draining and putting in so I just use the Regular Green coolant now. I dont hear a whining noise all the time only when the steering wheel is turned. So would that eliminate the Ps pump? Also I will clean out the radiator tonight and make sure everything is free of debris. Thanks for the advice you guys have been giving me. You dont understand how frustrating this is and how it upsets me inside when I can't figure out the problem on a car. I dont claim to be a master mechanic or anything but I try my best. I have to hand it to you guys though for knowing what you are doing. You are saving me alot of money. Thanks and I will come back as soon as I get some money and changed those parts out and will let you know if that fixes the problem.

Thanks Jeff and skperformance, I took it to a mechanic today and he said most likely its the fan or power steering pump. Does the power steering pump sound right to you?

When I first got the lexus the temp gauge would only rise to the first mark for the first year that I had the car. Right now when I drive the car it warms up really fast going to the first mark and when I start driving it in residential areas making stops the mark goes towards the middle but doesnt quit reach it there and then goes down when I start driving again. When the car was normal the tempature gauge use to just stay in one spot. I also am noticing some antifreeze being pushed out the reserve tank.

Hello, I have a 1993 Lexus Es300. My problem is that when I drive on residential streets the Tempature gauge increases past the first marker and gets almost into the middle and when I drive on the highway it goes back down to normal tempature. I have replaced already the Waterpump, Thermostat, Radiator cap, and replaced the coolant in the car three times. I notice when I first start my car it warms up pretty quickly. I know that the fan runs off of the power steering and I noticed my power steering fluid was kinda of low so I added more into it but still the problem exist. Can any one else suggest anything to me that would guide me to fixing the problem? Thanks for you time and reading this long post.