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

Reply
 
Thread Tools Display Modes
Old 7th January 2019, 11:00   #1
smudge.g
Gets stuck in
 
smudge.g's Avatar
 
75 Tourer CDTi Connie SE

Join Date: Jun 2017
Location: Keith, Banffshire
Posts: 686
Thanks: 431
Thanked 132 Times in 105 Posts
Default Warm fuzzy feeling!

I have read that the diesels normally take longer to heat up and as a result, were originally fitted with the FBH. I just wondered whether mine is behaving normally as it takes just over 5 mins for the temp needle to reach 9o'clock position most days, as I cruise along the A96 at about 60. It is also very noticeable that its get quite warm inside the cabin quickly (I tend to leave CC at 21 Deg C) and this lasts for about 15mins then the temp drops. I bought a used FBH to fit soon but if this is normal behaviour, then i may not need it, as this also occurs when we have chilly temps up here (-6 last week!). Any thoughts??

ps I havent been able to get the digital temp displayed as my attempts to get test data up on the display fails - possibly not quick enough on pressing the trip button!
__________________
My 75 Tourer CDTi was born Saturday, 21st June 2003 @ 09:50

My 75 was the 18,749th 75 Tourer to run off the production line, out of 27,407
It was the 195th 75 Tourer CDT Connoisseur SE (135) to be made out of 2,074
and the 1,789th 75 Tourer in Wedgewood Blue Metallic (code: JEL) to be made out of 1,871 Wedgewood Blue Metallic 75 Tourers
smudge.g is offline   Reply With Quote
Old 7th January 2019, 11:32   #2
Neil1
I really should get out more.......
 
MG ZT-T CDTI Auto

Join Date: Feb 2014
Location: Newton Abbot
Posts: 2,624
Thanks: 1,342
Thanked 518 Times in 425 Posts
Default

Normally the diesels take approximately 12 miles to get warm but if the Renault 5 thermostat has been fitted into the top hose then they do warm up much quicker.

I don't have climate just normal aircon and mine starts blowing warm air at about 3 miles so yours might well of had the same mod done.

I don't have a FBH fitted.
Neil1 is offline   Reply With Quote
Old 7th January 2019, 12:23   #3
trikey
Premium Trader
 
trikey's Avatar
 
Rover 75

Join Date: Nov 2010
Location: Devon
Posts: 33,710
Thanks: 8,837
Thanked 14,831 Times in 8,030 Posts
Default

The worrying bit for me is that you say the temp gets hot and then drops off.. I’m guessing you might have an airlock somewhere.
__________________
Lest we forget..
trikey is offline   Reply With Quote
Old 7th January 2019, 13:10   #4
harrisop48
Passed Away
 
Rover 75 Tourer Club CDTi 2.0 2002 Royal Blue Paint JFM Trim LBB

Join Date: Sep 2009
Location: Hayes West London
Posts: 1,218
Thanks: 528
Thanked 1,043 Times in 364 Posts
Default

Neil and Trikey,

Can you confirm that if you have a normal working thermostat in the engine
you can fit an additional stat in the top hose with no issue?

Thanks, Peter.
harrisop48 is offline   Reply With Quote
Old 7th January 2019, 13:56   #5
smudge.g
Gets stuck in
 
smudge.g's Avatar
 
75 Tourer CDTi Connie SE

Join Date: Jun 2017
Location: Keith, Banffshire
Posts: 686
Thanks: 431
Thanked 132 Times in 105 Posts
Default

Quote:
Originally Posted by trikey View Post
The worrying bit for me is that you say the temp gets hot and then drops off.. I’m guessing you might have an airlock somewhere.
I was wondering about this but either a)its normal and heats the cabin early first or b) its a sign of the thermostat opening and overall temp then falling as water is cooled.

Its not a problem but just wondered! Will have to have a feel around of the pipes to see if extra stat has been fitted.
__________________
My 75 Tourer CDTi was born Saturday, 21st June 2003 @ 09:50

My 75 was the 18,749th 75 Tourer to run off the production line, out of 27,407
It was the 195th 75 Tourer CDT Connoisseur SE (135) to be made out of 2,074
and the 1,789th 75 Tourer in Wedgewood Blue Metallic (code: JEL) to be made out of 1,871 Wedgewood Blue Metallic 75 Tourers
smudge.g is offline   Reply With Quote
Old 7th January 2019, 15:17   #6
slovcan
Gets stuck in
 
75 Tourer CDT MK2 manual in Glorious Grey

Join Date: Jan 2018
Location: Slovakia
Posts: 987
Thanks: 926
Thanked 346 Times in 252 Posts
Default

Quote:
Originally Posted by harrisop48 View Post
Neil and Trikey,

Can you confirm that if you have a normal working thermostat in the engine
you can fit an additional stat in the top hose with no issue?

Thanks, Peter.
It has been done, BUT can cause cooling problems. It adds a second potential failure point in the cooling system. Thermostats don't always fail in the open position. There is also the amount of restriction of coolant flow with a second restriction in a system that was designed for one.

Don't do it. If the original fails open (usual) you could get away with adding the inline temporarily. How long is temporary? That's like asking "How long is a piece of string?". Me? I would take out the failed original and install a full size inline thermostat (not the smaller Renault one), so future replacements are easy.

Cheers,
Glenn
__________________
Southern Slovakia

Anything can happen in Formula 1 and usually does - Murray Walker

1999 Triumph Trophy 900, Saddlesore 1600, Iron Butt Riders Association #63720

2005 Rover 75 CDT Tourer MK2
slovcan is offline   Reply With Quote
Old 7th January 2019, 16:20   #7
grivas
I really should get out more.......
 
grivas's Avatar
 
Rover 75 CDT Club Tourer

Join Date: Nov 2006
Location: Milky Way
Posts: 2,367
Thanks: 105
Thanked 513 Times in 382 Posts
Smile

Quote:
Originally Posted by harrisop48 View Post
Neil and Trikey,

Can you confirm that if you have a normal working thermostat in the engine
you can fit an additional stat in the top hose with no issue?

Thanks, Peter.
A 'normally' working original thermostat, does not require anything else, please confirm via digital readout that coolant temp reaches correct operating values when car is fully warmed up, after several miles of driving, if the car has never had a replacement original stat it would have almost certainly failed open.
grivas is offline   Reply With Quote
Old 7th January 2019, 16:21   #8
trikey
Premium Trader
 
trikey's Avatar
 
Rover 75

Join Date: Nov 2010
Location: Devon
Posts: 33,710
Thanks: 8,837
Thanked 14,831 Times in 8,030 Posts
Default

I have the Renault stat fitted in my diesel, it has the original stat (sticking open) still fitted and has had no issues for the last 50k miles, I reckon that a long enough test👍
__________________
Lest we forget..
trikey is offline   Reply With Quote
Old 11th January 2019, 10:29   #9
Neil1
I really should get out more.......
 
MG ZT-T CDTI Auto

Join Date: Feb 2014
Location: Newton Abbot
Posts: 2,624
Thanks: 1,342
Thanked 518 Times in 425 Posts
Default

Quote:
Originally Posted by harrisop48 View Post
Neil and Trikey,

Can you confirm that if you have a normal working thermostat in the engine
you can fit an additional stat in the top hose with no issue?

Thanks, Peter.
To be honest I don't know, I didn't fit it.

The original owner of the car did the mod.

All I can say is that in the past 3 years that I have had the car I haven't had any issues.

This was done by Jules and he explains it: https://www.the75andztclub.co.uk/for...+thermostat%29

Last edited by Neil1; 11th January 2019 at 10:35.. Reason: Added proof
Neil1 is offline   Reply With Quote
Old 11th January 2019, 13:04   #10
Avulon
This is my second home
 
1.8t Tourer

Join Date: Oct 2011
Location: Tanelorn
Posts: 4,830
Thanks: 956
Thanked 1,148 Times in 916 Posts
Default

As far as the engine getting up to temperature in the time described sounds about right. I'd treat the cabin temperature as a different issue.



I think I'd be checking to see if the cabin temperature sensor is blocked up (internally) with fluff. I strongly suspect our 1.8 is.



Also when it is cold in the cabin and the engine hot, with the AC on fully auto it will blast a lot of hot air into the footwells until the sensor detects the desired temperature. Once the temperature is reached it will moderate the amount of flow and the temperature of the flow - which can feel like it all of a sudden blows cold (especially over the knees). I strongly suspect that this effect is exacerbated if the temperature sensor is effectively being insulated from temperature changes by being full of fluff so giving a delayed reaction to temperature fluctuations.


Just a theory of course...
__________________
Need a T4 ?: T4 Owners Map thanks to Stevestrat ( use at your own risk)

Where?:
https://en.wikipedia.org/wiki/Tanelorn
Mods/Retrofits:

PCV vortex 'filter'; bluetooth; inline thermostat; reversing sensors; plenum spyhole ; headlamp washers ; Diy mp3 player replacing CD multichanger; FBH with remote; Headlamp washers; black/chrome front grille, rear blind; Xenon projectors
To do:
puddle lights; 2 Din cd/nav to fit; boot release button
Avulon 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 15:40.


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