Coolant disappearing from reservoir
#1
Driver School Candidate
Thread Starter
Join Date: Jun 2007
Location: IL
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Just got the radiator and thermostat replaced. No coolant visible on the surface or the pavement but it disappears almost 1/4 from the reservoir every day. I visually inspected all hoses but no leak is visible. Any insight on where the coolant might be going? Anything I can do to diagnose the problem?
ES 300, 1996
ES 300, 1996
#2
Super Moderator
![](https://www.clublexus.com/forums/images/ranks/rank-smod2.gif)
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
I am taking it you replaced your coolant, too, when you had the other things replaced. This happened to me with my RX300, and I had to fill it up to the full line each day for 3 days, and then it was back to normal. Otherwise, the only other place it can be going is via a leak, and I would check all around for a wet spot immediately after driving it...don't wait for puddles or the next day.
#5
![Cool](https://www.clublexus.com/forums/images/icons/icon6.gif)
Run the engine until it comes completely up to temp, take the plugs out & screw in a compression gauge. Watch the gauge while you turn the engine over (take out the EFI fuse so it wont squirt fuel at you)
Or hook in a more expencive leak-down gauge & do the same thing.
or take it someplace nice & have a pressure test of the cooling system done.
Or hook in a more expencive leak-down gauge & do the same thing.
or take it someplace nice & have a pressure test of the cooling system done.
#6
Lexus Champion
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Before you go to the bother of doing a compression test, do a pressure test of the cooling system. There's always the chance of a leaking head gasket which allows a bit of coolant to be drawn into the combustion chamber.
Sometimes you can see white vapor coming out of your exhaust pipe, but if the leak is very small you probably won't see it.
Sometimes you can see white vapor coming out of your exhaust pipe, but if the leak is very small you probably won't see it.
#7
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
as for the blown Head gasket.... i had this happen to my ES300(now sold)... make sure no white smokes are coming out the tail pipe or your engine oil looking muddy... good luck and pray it's not a blown head gasket......
Thread
Thread Starter
Forum
Replies
Last Post