Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 12th January 2020, 18:25   #11
charlie 22
Posted a thing or two
 
MG ZT-T 2.5V6, Mazda Cx30

Join Date: May 2011
Location: Greenford
Posts: 1,137
Thanks: 875
Thanked 165 Times in 132 Posts
Default

I had a problem for months with dropping coolant levels to the point the i was getting really concerned. No obvious leaks and even got my garage to pressure test the system and came back ok. Would top up check a phew days later and coolant gone from the header tank had to put in quite a lot to bring back to the max level on the header tank. With the help and patience of the members it turned out to be an air lock in the system. Now that it has been cleared the level has stayed consistent between levels in the header tank.

Sent from my SM-G977B using Tapatalk
__________________
Ugly Duckling
charlie 22 is offline   Reply With Quote
Old 16th January 2020, 08:36   #12
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,265
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Quote:
Originally Posted by charlie 22 View Post
I had a problem for months with dropping coolant levels ... No obvious leaks ... With the help and patience of the members it turned out to be an air lock in the system.


An excellent point Charlie, I had forgotten that one.

Martin; has your cooling system been drained and refilled recently without using the proper MG Rover procedure?

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is offline   Reply With Quote
Old 21st January 2020, 13:52   #13
Lord of Hog
Gets stuck in
 
Lord of Hog's Avatar
 
Rover 75 2.5 V6 in Wedgwood Blue

Join Date: Dec 2015
Location: Felbridge, East Grinstead
Posts: 982
Thanks: 250
Thanked 294 Times in 206 Posts
Default

This may sound daft but the smell of OAT is pretty unmistakeable. Get the car out of the wind and preferably in an enclosed space, stick your nose under the bonnet and have a good old snuffle. If there's a trace of it in the V you'll notice it (particularly with a slightly warm engine).

Secondly please remember that a lot of the points with the greatest potential for coolant loss are a) difficult to see and b) warm, meaning that your evidence is going to be nothing but a pink stain and will be hard to see. Hence the usefulness of the sniff test.

Thirdly, based on my own experience if it's not the thermostat O-rings, the thermostat straight pipe, the inlet manifold, the radiator or the plastic elbow on the radiator it's likely to be an air lock. Some of the coolant channels inside the engine are extremely narrow (hence their susceptibility to clogging with RadWeld and such) and can take a long time to give up any air that enters.
__________________


Conformity is not morality.
Consensus is not truth.
Lord of Hog 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


All times are GMT. The time now is 15:32.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd