This is not a complete DIY on a radiator fluid drain/fill but I noticed that there wasn't any information as to where the drain cock plug is located on the cylinder block for us Lexus IS250 guys. This step is required when replacing the entire amount of radiator fluid when accomplishing a coolant drain and fill.
Basically there are two drain plugs to drain the cylinder blocks of coolant; one on each side of the engine. I found an unrelated TSB which had a drain and fill as one of the steps. Luckilly it displayed a detailed picture of the location of the plugs.
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The passenger side was very easy to locate as it was directly under the header/exhaust manifold. I attached a 3/8" piece of tubing from the drain to run the coolant down to my bucket.
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As for the drivers side, it took me while to find the plug. I tried my best to take the pic to show the location but it was tight in there. It was just above where the motor mount attaches to the engine, hidden behind a loom of wires.
![Image]()
![Image]()
Some may say it is not neccessary to drain the block of coolant when performing a coolant drain and fill. I believe it is a good idea to do so because draining the radiator of fluid only drains about half of the system if I'm not mistaken. Hopefully this helps someone out though!
Basically there are two drain plugs to drain the cylinder blocks of coolant; one on each side of the engine. I found an unrelated TSB which had a drain and fill as one of the steps. Luckilly it displayed a detailed picture of the location of the plugs.
The passenger side was very easy to locate as it was directly under the header/exhaust manifold. I attached a 3/8" piece of tubing from the drain to run the coolant down to my bucket.
As for the drivers side, it took me while to find the plug. I tried my best to take the pic to show the location but it was tight in there. It was just above where the motor mount attaches to the engine, hidden behind a loom of wires.
Some may say it is not neccessary to drain the block of coolant when performing a coolant drain and fill. I believe it is a good idea to do so because draining the radiator of fluid only drains about half of the system if I'm not mistaken. Hopefully this helps someone out though!
