Hey all,
I recently dumped and filled my 2028 es350 cooling system. Now my guage is rock solid in the center and no overheating or anything .....but. The radiator is completly full as it should be and my reservoir tank is at full all seems fine. My puzzle is that the tank does not vary if hot or cold making me think there is an issued. My understanding and previous observation is that the tank should change level depending on the state of temp.
Scraching head.
And I'm pretty sure there is no air as I did bleed the system the "Car Care Nut" way.

 

I am having mine done in the morning. If mine is different, I will post. 'hope the gage is correct.

 

Thanks, to clarify my overflow tank was modulating when hot and cold before the fluid exchange.

 

Mine is changing levels between hot and cold using car nut bleed procedure.

 

I did my cooling system years ago, and the level stays the same all the time.

 

All the info I can find states that it should change. So still scratching head!? Today I went to O'reillys' and borrowed their pressure tester. I tested system and it would not hold. Pressure fell very slowly. I tested the tool with soapy water and the tool itself was leaking pressure. So frustrating during the process the radiator cap just vanished into thin air never to be seem again. Thankfully I had another as I just purchased a new one a couple day ago to confirm the cap was not part of or the problem. So now the old one is back on and the new one is in another dimension.

 

Richard is your car haunted? I'm sure not so, bur your loosing parts is as bad as mine. Anyway, I had my coolant changed this morning. It only took 1 gal. The mechanic could not find the air relief port that the Care Care Nur was using. So he squeezed the upper hose until no bubbles came out. The temp gage was rock solid on the way home. I checked after a couple of hours and it looked good. I will check in the morning to see if anything is different. In your case, I think that you can keep a close eye on the fluid levels. And act accordingly. If it aint broke, don't fix it.
Ed in the islands

 

So you guys are saying that if you mark your coolant level when car is cold (overnight), and then when you come from a long drive and immediately look at your coolant level its exactly the same as cold? If its exactly the same, it is NOT normal. It supposed to go up and down slightly if your system is completely sealed and has no air. I observed this behavior not only in Toyotas but also Hondas.

 

I agree, mine goes up considerably when it's hot, then gets slowly sucked back into the radiator/pipes when the car cools down.

 

Maybe radiator cap is not good and it sucks air instead.

 

I did replace the cap. But while testing for leaks yesterday it disapeared into the ether never to be seen again but while it was in place there was no movement of water levels.

 

when your car cools off at night, open radiator cap in the morning and see if radiator is filled all the way

 

Thanks, Yes it is full to the top.

 

Something not right. Maybe mark with marker current level, the change might be small. If level does not move even by 1/4”, you got problems…

 

Thanks, I started this thread thinking I had problems. What I was hoping for is a solution to a problem I can not understand. I point to the fact that the radiator is full and the reservoir is at the full line. Do I need to bleed the system again? Of course you could start thinking a leak in the block somewhere or a head casket. The oil is clear of any signs of water, I get zero coolent smell and the car is running like a top. Pre dump and fill the system as I remember modulated about 1/4 of the over flow tank. You statement of 1/4 inch could be missed just but the state of how level the car is when I check.