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 6th November 2016, 12:34   #1
Animesis
Loves to post
 
Animesis's Avatar
 
Rover 75 saloon 2.0l Diesel Connoisseur

Join Date: Apr 2016
Location: Wokingham
Posts: 259
Thanks: 136
Thanked 21 Times in 15 Posts
Default Coolant leak and Overheating?

the thermostat seal is weeping something terrible, losing about 500ml for 50-100 miles, so keeps needing topping up until the part arrives. My partner uses the car for work -im just the tech!- and didnt top it up at all last week, then complained the heater was cold and I had to top it up about a litre and a half.

What worried me is that before topping up the temperature gauge was at 9 oclock and not red light, but the dash test said the coolant was 125degrees c.

Surely at that temperature the needle should have gone beyond 9 o clock?
__________________
Gearbox change, clutch, subframe refurbish, handbrake mod, drumbrake repair, rear coils, plate PCB repair, sunroof drains refitted, trim leak fix, cruise control fix, cleared EGR/inlet, new strut bearings, USB sockets in rear ashtray, new front brake pipes/hoses, repaired undertray, new o/s rear upper arm, refurbished rear suspension&subframe, fixed back light leak, new exhaust, fitted HID xenons, FBH fix, new thermostat, armrest LEDs, wood dash, new hydromount, natnav, tyres, numberplates
Animesis is offline   Reply With Quote
Old 6th November 2016, 13:07   #2
Heddy
This is my second home
 
None

Join Date: Feb 2013
Location: None
Posts: 5,556
Thanks: 465
Thanked 1,161 Times in 924 Posts
Default

Well, the square rubber seal was causing my loss, underneath the engine cover on the outlet pipe, so not easily spotted.


Heddy is offline   Reply With Quote
Old 6th November 2016, 18:42   #3
COLVERT
This is my second home
 
R75 Saloon.

Join Date: Feb 2009
Location: France/or Devon.
Posts: 14,003
Thanks: 3,851
Thanked 2,167 Times in 1,816 Posts
Default

Quote:
Originally Posted by Animesis View Post
the thermostat seal is weeping something terrible, losing about 500ml for 50-100 miles, so keeps needing topping up until the part arrives. My partner uses the car for work -im just the tech!- and didnt top it up at all last week, then complained the heater was cold and I had to top it up about a litre and a half.

What worried me is that before topping up the temperature gauge was at 9 oclock and not red light, but the dash test said the coolant was 125degrees c.

Surely at that temperature the needle should have gone beyond 9 o clock?
If you let the temperature go like that a few more times you are going to RUIN your engine.--

At that temperature the light was probably just about to come on or maybe the light itself has failed. You are heading for a much, much greater bill than just replacing that leaking seal.----------

KEEP that rad topped up or soon you will be walking or travelling on the bus.---
COLVERT is offline   Reply With Quote
Old 6th November 2016, 19:21   #4
Animesis
Loves to post
 
Animesis's Avatar
 
Rover 75 saloon 2.0l Diesel Connoisseur

Join Date: Apr 2016
Location: Wokingham
Posts: 259
Thanks: 136
Thanked 21 Times in 15 Posts
Default

As I thought, my partner was watching the needle but as it hadnt changed didnt think anything was wrong. What controls the needle out of interest?
Since seeing that temperature I have firmly made it clear that the coolant must be topped up everyday before coming home until the thermostat is replaced...
__________________
Gearbox change, clutch, subframe refurbish, handbrake mod, drumbrake repair, rear coils, plate PCB repair, sunroof drains refitted, trim leak fix, cruise control fix, cleared EGR/inlet, new strut bearings, USB sockets in rear ashtray, new front brake pipes/hoses, repaired undertray, new o/s rear upper arm, refurbished rear suspension&subframe, fixed back light leak, new exhaust, fitted HID xenons, FBH fix, new thermostat, armrest LEDs, wood dash, new hydromount, natnav, tyres, numberplates
Animesis is offline   Reply With Quote
Old 6th November 2016, 20:10   #5
Stickman
Posted a thing or two
 
Stickman's Avatar
 
Rover 75 saloon

Join Date: Nov 2012
Location: Bordon
Posts: 1,856
Thanks: 250
Thanked 403 Times in 352 Posts
Default

You have a first class spanner wielding magician (shiner)living just down the road buddy
Regards
Chris
Stickman is offline   Reply With Quote
Old 6th November 2016, 21:12   #6
T-Cut
This is my second home
 
Rover75 and Mreg Corsa.

Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
Posts: 21,751
Thanks: 341
Thanked 3,660 Times in 2,924 Posts
Default

Quote:
Originally Posted by Animesis View Post
What worried me is that before topping up the temperature gauge was at 9 oclock and not red light, but the dash test said the coolant was 125degrees c.
Surely at that temperature the needle should have gone beyond 9 o clock?
The gauge is supposed to begin rising above 'normal' once the coolant temperature exceeds 115C. So yes, you would have expected some significant shift at 125C (OBD). The OBD and the gauge use the same data so it's not that one is right and one is wrong. But exactly why it didn't move I haven't a clue at present. The red light will pop on at around 127-130C according to the MGR thermal profile. I doubt a few seconds at 125C is anything to worry about. On a diesel I think you're pretty safe. Most regular head gaskets need rather more to exceed service specification. I once had a new head fitted to a Rover and there was a thermal sticker on it for warranty purposes. It permanently changed colour when heated. The in-warranty level was 140C maximum.

TC
T-Cut 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 09:00.


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