CDTi Thermostat leaking

vilas66 · 6th January 2017, 16:44

Hi there, well my CDTi suffered for a few months of a small amount coolant loss but I never found a leak until tomorrow, maybe just because the weather is really cold here in Rome. She is leaking from the thermostat housing which I replaced a couple of years ago and seems also that the leak disappears with warm engine. I know there are lots of how to's and threads about this matter, the question is: should I replace the gasket only or the whole thermostat and, also, providing that for ten years the car has been fine with original thermostat and the one replaced started to leak after two years, is that a normal behavior or the mechanic didn't gave the proper attention ?
Thx.
Canio

SD1too · 6th January 2017, 18:37

Hello Canio (SD1 2000 owner

),

Quote:

Originally Posted by vilas66

... the question is: should I replace the gasket only or the whole thermostat ...

Replace only the gasket (a thermostat cannot be responsible for an external coolant leak).

Simon

COLVERT · 6th January 2017, 18:43

As above post. The gasket was not up to the job required.

Could also be the Mechanic was not up to the job either.--

T-Cut · 6th January 2017, 19:00

Quote:

Originally Posted by COLVERT

The gasket was not up to the job

IMO it's got failure written all over it.

TC

SD1too · 6th January 2017, 19:03

Quote:

Originally Posted by T-Cut

IMO it's got failure written all over it.

A BMW part?

Surely some mistake?

Simon

vilas66 · 6th January 2017, 19:47

..well this time I'm tempted to do the job myself but...don't know really....
Apart of that gasket what other bits should I replace to avoid trouble in the future ? Thx

Mike Noc · 6th January 2017, 20:43

The O ring that sits on the pipe going into the thermostat housing is worth replacing seeing as you are in there.

patrolman pete · 6th January 2017, 21:29

I recently also had a leak from my thermostat housing and noticed it was coming from the metal pipe joint into the thermostat. Removed the pipe after unbolting it from the back of the engine and found 1/4 of the o ring had disappeared! One new o ring and a few cuts and bruises and it was back to being bone dry!

tourer · 7th January 2017, 07:21

My leak from the stat was only the o-ring, too.
Bug ger to get to, though.

vilas66 · 13th January 2017, 07:36

...well things are getting worse on my CDTi, this morning I've spot coolant coming from both side (right and left) of the engine undertray. Quite sure that RH side comes from the thermostat, the question is now ... from what f...g part of cooling system can come the LH side leak ?
I do not want order and buy a complete cooling system so any help appreciated...
Thx once again, Canio

6th January 2017, 16:44	#1
vilas66 Avid contributor Rover 75 CDTi Tourer, CDTi Tourer, Saloon Join Date: Sep 2007 Location: ROME Posts: 216 Thanks: 60 Thanked 32 Times in 22 Posts	CDTi Thermostat leaking Hi there, well my CDTi suffered for a few months of a small amount coolant loss but I never found a leak until tomorrow, maybe just because the weather is really cold here in Rome. She is leaking from the thermostat housing which I replaced a couple of years ago and seems also that the leak disappears with warm engine. I know there are lots of how to's and threads about this matter, the question is: should I replace the gasket only or the whole thermostat and, also, providing that for ten years the car has been fine with original thermostat and the one replaced started to leak after two years, is that a normal behavior or the mechanic didn't gave the proper attention ? Thx. Canio __________________ Rover 75 Connoisseur Tourer (Two), Contemporary SE Saloon and (** most of all ) Wolseley 6/99 and SD1 2000 owner Regular Member**

6th January 2017, 19:47	#6
vilas66 Avid contributor Rover 75 CDTi Tourer, CDTi Tourer, Saloon Join Date: Sep 2007 Location: ROME Posts: 216 Thanks: 60 Thanked 32 Times in 22 Posts	..well this time I'm tempted to do the job myself but...don't know really.... Apart of that gasket what other bits should I replace to avoid trouble in the future ? Thx __________________ Rover 75 Connoisseur Tourer (Two), Contemporary SE Saloon and (** most of all ) Wolseley 6/99 and SD1 2000 owner Regular Member**

13th January 2017, 07:36	#10
vilas66 Avid contributor Rover 75 CDTi Tourer, CDTi Tourer, Saloon Join Date: Sep 2007 Location: ROME Posts: 216 Thanks: 60 Thanked 32 Times in 22 Posts	...well things are getting worse on my CDTi, this morning I've spot coolant coming from both side (right and left) of the engine undertray. Quite sure that RH side comes from the thermostat, the question is now ... from what f...g part of cooling system can come the LH side leak ? I do not want order and buy a complete cooling system so any help appreciated... Thx once again, Canio __________________ Rover 75 Connoisseur Tourer (Two), Contemporary SE Saloon and (** most of all ) Wolseley 6/99 and SD1 2000 owner Regular Member** Last edited by vilas66; 13th January 2017 at 07:41..

6th January 2017, 18:43	#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	As above post. The gasket was not up to the job required. Could also be the Mechanic was not up to the job either.--

6th January 2017, 20:43	#7
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,550 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	The O ring that sits on the pipe going into the thermostat housing is worth replacing seeing as you are in there.

6th January 2017, 21:29	#8
patrolman pete Posted a thing or two Rover 75 club se tourer CDT and a Connoisseur SE Diesel Auto Saloon Join Date: Nov 2006 Location: Houghton - le - Spring Posts: 1,418 Thanks: 618 Thanked 333 Times in 197 Posts	I recently also had a leak from my thermostat housing and noticed it was coming from the metal pipe joint into the thermostat. Removed the pipe after unbolting it from the back of the engine and found 1/4 of the o ring had disappeared! One new o ring and a few cuts and bruises and it was back to being bone dry!

7th January 2017, 07:21	#9
tourer Posted a thing or two Rover 75 Tourer CDT Auto. Join Date: Oct 2011 Location: Long Eaton Posts: 1,342 Thanks: 30 Thanked 220 Times in 160 Posts	My leak from the stat was only the o-ring, too. Bug ger to get to, though.