Question about 1990 Lexus LS 400

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How to replace a thermostat on a 1990-lexus ls 400

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Open the hood and locate the big hose that comes form the radiator on the top it is under the air channel cover that goes across the top of the radiator remove it and you will see the hose in the middle of the front of the engine remove the 2 bolts and be careful not to spill alot of your coolant or if it is hot to burn yourself once you get the thermostat housing off pop the old one out and put a new o ring or gasket in there with the new one tighten it back up and put the air channel back on and re fill the coolant start it check for leaks and you are good to go if there are no leaks.

Posted on Jul 18, 2010


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I just purcgased a 1990 Lexus ls 400 and the coolant light came on it has a full tank of coolant is this a bad sessor or what?

It does sound like the sensor is either dirty inside the tank or bad. You will have to remove the overflow tank and the sensor is torward the bottom of the tank and easily replaced.

Sep 09, 2010 | 1990 Lexus LS 400

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Lexus 400 sc thermostat installation

Follow the radiator hose from where it attaches to the radiator, the bulb it is attached to contains the thermostat. put the old one in a pan of boiling water to see if it opens and closes if not replace, be sure to clean the surface that this metal bulb rests one both bottom and top and use a good sealer when re installing with a NEW gasket, take care in NOT tightening the two bolts too tight as that is light cast iron or aluminum

Jul 16, 2010 | 1990 Lexus LS 400

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Front strut replacement 1990 lexus ls 400

u will need to remove tires and support car on jack stands under the hood u will find three nuts holding the strut up u can only pull strut off once u hav removed all other bolts from below car... go to auto and look up repair manuals they will be free after u sign up which is also free

Apr 21, 2010 | 1990 Lexus LS 400

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I have a 1990 Lexus LS 400 and I was told the alternator is the problem....The lights, radio, and tail-lights do not work (Nothing electrical even with a new battery). Could this be the only problem??...

I would inspect your wires at the starter. If you live up north then corrosion is bad, clean all wires going to starter. then clean wires to back of alternator. I seriously doubt that alternator is the problem, but if you remove it you can have it tested for free at most parts stores.

Feb 13, 2010 | 1990 Lexus LS 400

1 Answer

What size gas tank does 1990 lexus ls 400 have?

Fuel tank: 22.5 Gls.

More details in Lexus LS400

I hope helps with this (remember rated this help) Good luck.

Jan 04, 2010 | 1990 Lexus LS 400

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1990 Lexus Ls 400. What tempture is my car suppose to run at?

your car should not be near that, it should stay at the middle line or a little under. You need to keep an eye on your radiator fluid level. I just changed the radiator and thermostat in my wifes car. DO NOT DRIVE YOUR CAR IF ITS RUNNING THAT HOT, IT WILL BLOW YOUR MOTOR!!!

Jul 25, 2009 | 1993 Lexus Ls 400

1 Answer

1991 lexus ls 400

key and or tumblers are worn. need to replace one or both.

Mar 07, 2009 | 1990 Lexus LS 400

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