Coolant leak

lionatus · 29th September 2016, 19:52

Have a leak somewhere. Seems to be coming from back of engine. Drops can be seen from behind the gearbox almost centre of engine bay to the nearside. But, I have bubble in expansion tank sometimes; so is the dripping running along the edge at the back from the thermostat? Seem to remember someone telling me bubbles into expansion tank was a cracked thermostat. Driving me nuts have to top up quite a lot although its not as bad since I replaced the expansion cap lid.

DMGRS · 29th September 2016, 23:10

Which engine do you have?

Walter · 30th September 2016, 00:26

Quote:

Originally Posted by DMGRS

Which engine do you have?

cdt tourer

lionatus · 30th September 2016, 07:24

Quote:

Originally Posted by Walter

cdt tourer

as above Walter beat me to it.

lionatus · 30th September 2016, 23:43

Bump as I need to know. Need to be mobile mainly in case my son, who has leukaemia, needs to get to hossie within a couple of hours. I did the never never and used radweld. Does it dry as blue rubber???? asking s there is a blue rubbery deposit now at the seal of the thermostat. Saying that am assuming that the gap there is now sealed so why am I still losing coolant??

Quote:

Originally Posted by lionatus

as above Walter beat me to it.

spyder · 1st October 2016, 00:07

The seal at the back of the thermostat has gone. It is blue rubber, so probably squeezed out. rad weld will not help really.

Can be replaced easily, just lots of bits to remove and very small hands help.

http://www.the75andztclub.co.uk/foru...d.php?t=245284

lionatus · 1st October 2016, 00:26

Would that be why I overheated on a long trip which is when I really noticed the leak. Red light overheat(the only time Ive seen above 9 o clock). 2 mins later all good ready to go. Since then coolant on top of expansion tank as Im not sure my replacement is kosha.. even if it it from landie spares company... only get leaks now and agin showing under car. coolant still disappears. So thermo is next on list...

I still have a flywheel clutch etc to get sorted. Which slave should I get for HN52 XMB as there are 2, one that needs new master and other nthat doesnt?

Quote:

Originally Posted by spyder

The seal at the back of the thermostat has gone. It is blue rubber, so probably squeezed out. rad weld will not help really.

Can be replaced easily, just lots of bits to remove and very small hands help.

http://www.the75andztclub.co.uk/foru...d.php?t=245284

SD1too · 1st October 2016, 08:33

Quote:

Originally Posted by lionatus

I did the never never and used radweld.

Alan; for future reference, don't use any sealant additives. They just cause more problems. Make sure that you drain the cooling system fully, including using the cylinder block drain plug, and attempt to flush as much of it out as possible.

Here's the refilling/bleeding procedure you need to follow.

Simon

lionatus · 2nd October 2016, 17:58

well that was a search and a half or at least Im guessing Ive found the culprit. My leak, a guess as Ive not witnessed it, appears to be coming from the area of the drain plug. Always near back of engine at the leftish hand side. But as Ive seen blue rubber at the thermostat and have been advised seal is gone I guess I'll replace that too. Am assuming a possible test would be to take drain plug off and then use threadseal and then go from there?

Quote:

Originally Posted by SD1too

Alan; for future reference, don't use any sealant additives. They just cause more problems. Make sure that you drain the cooling system fully, including using the cylinder block drain plug, and attempt to flush as much of it out as possible.

Here's the refilling/bleeding procedure you need to follow.

Simon

29th September 2016, 19:52	#1
lionatus Loves to post MG ZT-T Join Date: Nov 2014 Location: Hawick Posts: 350 Thanks: 46 Thanked 22 Times in 22 Posts	Coolant leak Have a leak somewhere. Seems to be coming from back of engine. Drops can be seen from behind the gearbox almost centre of engine bay to the nearside. But, I have bubble in expansion tank sometimes; so is the dripping running along the edge at the back from the thermostat? Seem to remember someone telling me bubbles into expansion tank was a cracked thermostat. Driving me nuts have to top up quite a lot although its not as bad since I replaced the expansion cap lid.

29th September 2016, 23:10	#2
DMGRS Discount MG Rover Spares Rover 75 CDTi, 2x MG ZS180 Join Date: Jun 2011 Location: Hythe, Southampton Posts: 11,320 Thanks: 456 Thanked 3,377 Times in 2,027 Posts	Which engine do you have? __________________ Your trusted MG Rover specialist! Tel: 02380 001133 / Email: [email protected] We now have a 'chat' function on our site for even quicker replies. Give it a try! Remember - discount code FORUM5 for 5% off

1st October 2016, 00:07	#6
spyder This is my second home 75 CDT Auto Tourer , Rover 45 , Astra, Zaffira, Chev Captiva Join Date: Mar 2011 Location: Wilts Posts: 3,342 Thanks: 203 Thanked 436 Times in 360 Posts	The seal at the back of the thermostat has gone. It is blue rubber, so probably squeezed out. rad weld will not help really. Can be replaced easily, just lots of bits to remove and very small hands help. http://www.the75andztclub.co.uk/foru...d.php?t=245284 __________________ Chrome skull caps, EGR cleaned (original housing), Mondeo lower mounting, 12V outlets in the armrest and tourer boot, cat fixed, working FBH, Lidl plenum covers, DD with reverse camera.New speakesr/Tweeters with MDF rings. wood dash, Memory leather seats, wooden finished steering and handbrake, Xenon headlights. Last edited by spyder; 1st October 2016 at 00:12..