Coolant level question
Thread Starter
Lead Lap
Joined: Apr 2004
Posts: 3,566
Likes: 49
From: Illinois
Coolant level question
Hey everyone. 2006 GS430. Quick question about the coolant level. When the car is fully warm, the coolant level is between full cold and full hot, maybe a tad closer to full cold. Should the level be closer to or at full hot or is it okay as long as it’s in between? Thank you.
Instructor
Joined: Dec 2014
Posts: 780
Likes: 261
From: MA
Hey everyone. 2006 GS430. Quick question about the coolant level. When the car is fully warm, the coolant level is between full cold and full hot, maybe a tad closer to full cold. Should the level be closer to or at full hot or is it okay as long as it’s in between? Thank you.
Thread Starter
Lead Lap
Joined: Apr 2004
Posts: 3,566
Likes: 49
From: Illinois
OK, I just checked again and when cold it is below the low line. When warm, it is slightly above the low line. It does not appear to be leaking and I don’t know how long it’s been like that. I bought a gallon of Toyota coolant on Friday. I assume I can pour it directly into the reservoir? And I do that when the car is warm and fill it to just below the full line?
Thread Starter
Lead Lap
Joined: Apr 2004
Posts: 3,566
Likes: 49
From: Illinois
Thanks so much. When the engine is cold and I look inside the reservoir, I can see the level of the coolant is at the very bottom of the reservoir, like just above the outlet spout at the bottom. When hot, the level is just above the low line. Based on this, if I fill it to just above the low line when cold, I don’t think it will reach the full line when hot. Maybe I shouldn’t do anything like the first person who responded said?
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Thread Starter
Lead Lap
Joined: Apr 2004
Posts: 3,566
Likes: 49
From: Illinois
Yep, about to turn 190k. 2006 GS430. I had the coolant flushed and filled at around 100k. Here’s the thing. I never check it. It could have been like this for the last 100k and I wouldn’t have known. I did have an oil change at the Lexus dealership last June at around 188k miles. I have no idea if they would have checked the coolant level at that time.
Lexus Fanatic
Joined: Sep 2010
Posts: 26,190
Likes: 4,379
From: Alberta
I would replace the radiator (Denso) and new OEM radiator cap. There are other causes of leaks but that's almost always the fix. Even if your rad is not leaking it probably will be soon. Naturally an actual diagnosis is better instead of firing the parts canon.