Question about Lexus LS 400

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1995 ls 400 have replaced water pump ,radiator,thermostat , reaver cap.I have no water in oil and it doesnt smoke .burped the system . Is their ports that could be clogged preventing water flow ?

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Check Compression on cylinders looking for a bad head gasket. Look for bubbling in coolant and check spark plugs for residue. Check exhaust for steam.

Hope this helps?
1995 ls 400 have  replaced water pump ,radiator,th - 26229327-wbjtasehhf1ryoyttao3q0tt-1-0.jpg

Posted on Jul 01, 2016


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I have a T reg Peugeot 106, the temperature light keeps coming on even thou I've topped the oil up. Any info plz

It is also possible you have other issues, such as a bad thermostat, bad temp gauge sender, missing fan shroud, bad fan thermostat switch, bad fan motor, or even just clogged radiator core or fins.

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Will an air pocket in the coolant system cause it to overheat or over pressurize on a 2001 Nissan Sentra ?

1. The radiator cap if working correctly it will release pressure in the system provided the cap you have is the correct pressure setting. If you are having a problem with pressure then replace the cap with a new radiator cap with the correct pressure setting. Do not use a cap with a pressure setting other than the original equipment pressure spec. So you do not go to the parts store and buy any radiator cap on the shelf that fits because they come with different pressure ratings and some of these will be totally unsuitable for your car.

2. If the pressure valve is stuck in the "old" cap the pressure release system will not work.

3. Overheating
Air pockets in the cooling system can definitely cause overheating and can retard coolant flow through the system. If you are draining the radiator to replace the coolant or replacing the radiator you need to follow the correct procedures for bleeding air out of the system for that particular engine after coolant refilling. Some engines have bleeder screws on the cooling system to assist in the air bleeding procedure and some don't.

There are various causes for overheating so don't assume it will necessarily be solved by bleeding any remaining air from the cooling system and replacing the radiator cap with one that works.

Other causes can be...........
1. Faulty cooling system thermostat. (Replace the Thermostat)
2. Faulty water pump, especially if the impellers have corroded away or have disintegrated in the case of those design genius water pumps with plastic impellers. (Replace the water pump)

3. Cooling fans not working and if so the cause needs to be tracked. Check that your fans are kicking in. If the engine is overheating the fans should be running because they will switch on when the coolant reaches a specific temp and well before the coolant gets excessively hot.

4. A partial blockage in the coolant passages inside the engine but not in the radiator if you have a new one. If the coolant is not changed at the required intervals(frequently the case with many owners) or is over diluted with water you can get a build up of debris. If products like stop leak have been used in the system this can create similar problems with partial blockages inside the engine coolant passages.

5. A compression leak into the cooling system.
If you have bled air from the system and have continuous air bubbles in the cooling system I would suspect a compression leak. In that event a basic leak down test will show if you have compression gasses leaking into the cooling system and from which cylinder(s). The spark plug is removed and compressed air is forced into the cylinder via the spark plug fitting and air bubbles will show up in the coolant of there is a leak into the cooling system.
Have the problem with overheating addressed immediately. Running the engine with an overheat condition will cause expensive engine damage many times the cost of fixing the overheating issue.


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How do you burp the cooling system replaced t stat and water pump still over heats

Start the engine with the radiator cap off. When the thermostat opens the water level will drop. Keep adding water slowly till it takes no more water and then cap to pressurize. Also fill the excess tank to recommended level marking on side of tank.

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I have changed the thermostat and car still runs hot

It could be that your cooling system wasnt properly burped which is getting all the air bubbles out.
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93 chevy cavalier 3.1 over heating and heater blows cold, new water pump, thermostat, rad. cap, flushed the radiator, drilled a small hole in the edge of the thermostat, no water in oil and it doesnt...

had a similar problem myself. wound up being the radiator having a restricted flow in spite of being flushed and cleaned. also have you checked to make sure that your cooling fan is functioning properly? also your cooling system could possibly be airlocked, but i doubt it. i would be willing to bet that it is either your radiator not flowing properly. hope this helps out.

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Its going to stay hot and lose pressure until you fix the leak.

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