The Brick-yard Homepage Brickwerks
Forum Home Forum Home > T3 Section > T3 Tech help
  New Posts New Posts RSS Feed - Coolant problem
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Coolant problem

 Post Reply Post Reply
Author
Message
beno View Drop Down
Not Quite Newbie
Not Quite Newbie


Joined: 22 Oct 06
Location: United Kingdom
Status: Offline
Points: 39
Post Options Post Options   Thanks (0) Thanks(0)   Quote beno Quote  Post ReplyReply Direct Link To This Post Topic: Coolant problem
    Posted: 18 Apr 18 at 22:05
Having some fun and games with my 1.9dg bus.

Have had a new head gasket and water pump.

But the coolant keeps migrating from the header tank to the expansion tank until the low coolant warning light comes on and you can see small bubbles coming from pipe attached to the dalek cap?

Have had a chemical test which showed no exhaust gas in the coolant and have replaced the dalek cap.

This only happens on a long motorway run, is fine on my 20 mile commute to work.

It starts and runs well and it never gets hot, even on a big hill fully loaded, any ideas?
rip it up!
Back to Top
Pete Westy View Drop Down
Yardie
Yardie


Joined: 16 Aug 07
Location: Under the van
Status: Offline
Points: 582
Post Options Post Options   Thanks (0) Thanks(0)   Quote Pete Westy Quote  Post ReplyReply Direct Link To This Post Posted: 19 Apr 18 at 19:22
When the coolant gets hot it is supposed to expand thro the dalek cap into the expansion tank. 
When the engine cools down the coolant contracts creating a vacuum in the coolant system and the 'overflow' is supposed to be sucked back.

If it is not being sucked back it is either a leaky hose between main and expansion tanks or else a cracked expansion tank.
The above assumes that you don't have leaks elsewhere or airlocks.


Edited by Pete Westy - 19 Apr 18 at 19:24
Pete



I've spent so much time under the Atlantic I'm changing my name to Titanic.
Back to Top
beno View Drop Down
Not Quite Newbie
Not Quite Newbie


Joined: 22 Oct 06
Location: United Kingdom
Status: Offline
Points: 39
Post Options Post Options   Thanks (0) Thanks(0)   Quote beno Quote  Post ReplyReply Direct Link To This Post Posted: 19 Apr 18 at 21:52
Thanks Pete, will have a tinker this weekend and see if I can get it sorted.

Ordered a vw dalek cap just in case mine is faulty.

Cheers, Ben
rip it up!
Back to Top
Pete Westy View Drop Down
Yardie
Yardie


Joined: 16 Aug 07
Location: Under the van
Status: Offline
Points: 582
Post Options Post Options   Thanks (0) Thanks(0)   Quote Pete Westy Quote  Post ReplyReply Direct Link To This Post Posted: 19 Apr 18 at 23:12
A quick check on the dalek cap is to blow through it and it should go quack.
Pete



I've spent so much time under the Atlantic I'm changing my name to Titanic.
Back to Top
 Post Reply Post Reply

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.06
Copyright ©2001-2023 Web Wiz Ltd.

The WebThis site