Toyota Yaris Forums - Ultimate Yaris Enthusiast Site
 

 


 
Go Back   Toyota Yaris Forums - Ultimate Yaris Enthusiast Site > Technical Forums > DIY / Maintenance / Service
  The Tire Rack

Reply
 
Thread Tools Display Modes
Old 11-04-2014, 09:36 AM   #1
tmontague
 
tmontague's Avatar
 
Drives: '08 2zr swapped Vios M/T
Join Date: Oct 2012
Location: Caledonia Ont.
Posts: 2,938
coolant reservoir/upper radiator level

I recently flushed and filled my coolant following CT's guide which drain's the block, 'rad and the overfill reservoir. I also replaced the t-stat, gasket and radiator cap.

It's now been a week since I have topped it back up and every evening I have been topping up the radiator after the engine cools since I drive about 90km round trip out to school and back. The topping up is expected due to air being brought to the surface.

I will top the 'rad up with about 1/6 a cup of coolant and then drive for a while. When it cools the coolant is no longer at the top of the cap, it is only seen when the top 'rad hose is squeezed. I figured by now the air should all be out of the system.

The other day I noticed that the coolant level dropped a little as usual at the top of the 'rad but the overfill reservoir level increase about that same amount that was lost.

My question is this: Why is the coolant not being pulled form the reservoir back to the top of the 'rad cap when it cools? I understand that this will not cause any engine problems but it should be topping up to the cap.

I have checked for leaks and water pump issues and there are none, everything is working fine with the cooling/heating system and there are no leaks what so ever.

My theory is that there is air in the line going from the bottom of the reservoir up to the rad cap opening. I am going to try pushing the air out of the line and see if this stops the issue. It seems that the system is not loosing any coolant but it is not fully being pulled from the reservoir back into the top of the rad when the coolant cools.

If anyone has any experience solving this annoyance please let me know.
tmontague is offline   Reply With Quote
Old 11-04-2014, 09:54 AM   #2
CTScott
ULTIMATE
 
CTScott's Avatar
 
Drives: 09 5dr LB, 2x 08 3dr LB
Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
Typically the coolant isn't sitting at cap level when cold. As long as the hose is full, it is fine/normal for the coolant to not go all the way up the neck. It will typically only do so when the system is hot and you dangerously open the cap.
__________________
CTScott is offline   Reply With Quote
Old 11-04-2014, 12:15 PM   #3
tmontague
 
tmontague's Avatar
 
Drives: '08 2zr swapped Vios M/T
Join Date: Oct 2012
Location: Caledonia Ont.
Posts: 2,938
thanks for the input. I was thinking that since many other people have the same issue. I was also was wondering if maybe the new cap I put on the rad could've been defective. I still have the old one which I could always try if need be.

Tonight I'll be pulling out some coolant from the reservoir (which is above the full line even when cool) and putting it in the top of the rad to see if it stays there
tmontague is offline   Reply With Quote
Old 11-04-2014, 12:32 PM   #4
CTScott
ULTIMATE
 
CTScott's Avatar
 
Drives: 09 5dr LB, 2x 08 3dr LB
Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
Quote:
Originally Posted by tmontague View Post
thanks for the input. I was thinking that since many other people have the same issue. I was also was wondering if maybe the new cap I put on the rad could've been defective. I still have the old one which I could always try if need be.

Tonight I'll be pulling out some coolant from the reservoir (which is above the full line even when cool) and putting it in the top of the rad to see if it stays there
If the cap was not sealing you would see streaks of dried coolant running down the neck.
__________________
CTScott is offline   Reply With Quote
Old 11-05-2014, 09:11 AM   #5
tmontague
 
tmontague's Avatar
 
Drives: '08 2zr swapped Vios M/T
Join Date: Oct 2012
Location: Caledonia Ont.
Posts: 2,938
The other night I tried squeezing the top rad tube until the coolant was at the top of the filler hole. I then would put the cap on and than release the hose I was squeezing as I figured this would create negative pressure and suck coolant from the reservoir. I could hear what sounded like coolant being sucked back into the top but when I opened the cap the coolant level was back to where it was before.

I think I'll just leave it for now as it isn't causing any problems and maybe over time is will normalise and coolant will be back at the top of the cap.
tmontague is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Various problems with service at shop (green coolant and accelerator rattling noise) LilyOfTheYaris DIY / Maintenance / Service 4 04-08-2014 10:31 PM
Khameleon Coolant? LilyOfTheYaris DIY / Maintenance / Service 18 04-08-2014 10:27 PM
Alternatives to Toyota "pink" super long life coolant Camberix DIY / Maintenance / Service 10 03-30-2011 11:42 AM
coolant reservoir? toad DIY / Maintenance / Service 10 11-02-2010 11:02 AM
Check your coolant bottle UTVitz DIY / Maintenance / Service 13 12-16-2009 09:13 PM


All times are GMT -4. The time now is 06:56 PM.




YarisWorld
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.