Oh jeez, where do i start? - Page 9

SD1too · 3rd May 2022, 19:12

Quote:

Originally Posted by slovcan

I'm glad you are seeing this through, Simon. Not surprised, glad.

Thank you Glenn for your interest and appreciation!

Yes, the offending garage was named by Lida earlier in this thread.
Like you, I suspect the thermostat.

Simon

lida · 3rd May 2022, 20:16

Thanks to Simon for posting this update. A drive starts off well, and Simon was optimistic that this gremlin had gone. But from my drive to his this morning I too got my hopes up, and of course it turned out to be a flash in the pan.

There appears to be no correlation between speed, gradient and coolant temp. In fact, Simon remarked today that he would have expected the temp to reduce when driving briskly, but in fact (sometimes) temp fell to normal range when driving at just below 30 mph.

I'm throwing out this puzzle to anyone interested to solve it. Today the coolant level was just a bit higher than it has been in the last week. I know it suggests an airlock, but where would that have come from?

If the thermostat is opening, closing and half-closing erratically, could that fault be responsible for creating enough turbulence in the coolant to create an airlock?

On my way home, I reached 111°C, but a little later reduced to 92, then up again.

The other thing I would be interested to find out is how the hell did the garage access the thermostat housing in order to fit another one? Looking around there is no evidence that screws or other retainers have been removed, and there's dust where you would expect it to be. Even with the air filter housing removed, and working sideways, it seems an unlikely route. Therefore, what is the famous 'sideways' approach?

trikey · 4th May 2022, 12:08

Remove throttle body and access the thermostat that way, I doubt the garage would have done it that way though as they don’t sound competent enough!

Martin Butler · 4th May 2022, 13:20

The garage may have fitted land rover parts, but its not unknown for a new part to fail straight out of the box, often with manufacturing defects, such as a malformed pin, or something, that prevents the item performing as intended, only way is to try another thermostat, see if that clears the issue, I would be very surprised if its an air lock because the system has been bled several times now.

lida · 4th May 2022, 13:38

Thanks Martin. That's what I suggested to the garage. I think logically and, afterall, what new component could affect temp if not the stat? But it would have been another pile of money, because they were not willing to do at their cost. I don't know whether the following system exists, but surely a garage can cross-charge Land Rover for removal and installation of a new stat.

Arctic · 4th May 2022, 22:26

Quote:

Originally Posted by trikey

Remove throttle body and access the thermostat that way, I doubt the garage would have done it that way though as they don’t sound competent enough!

Key hole surgery

https://the75andztclub.co.uk/forum/s...d.php?t=129825

I did mine back in 2014 but alas all the photo are missing now.

https://www.the75andztclub.co.uk/for...1&postcount=27

https://www.the75andztclub.co.uk/for...1&postcount=32

lida · 5th May 2022, 08:45

ARCTIC. This is magnificent! Very well written and the photos are an invaluable guide. The bit that worries me is of course the throttle body, because spring-loaded bits & bobs, or brittle ones, may crumble or ping off never to be seen again - and then what do you do?

If I do go ahead with all of this work to solve why my 75 is running hot and also giving erratic temp readings, and then we find that the thermostat is not the culprit, I wouldnt know where to go from there.

Thanks again, this is a wonderful forum.

COLVERT · 2nd June 2022, 14:10

Was there a result to this thread ??--Have I missed it ??--

SD1too · 3rd June 2022, 06:40

I'm still in touch with Lida Jon and no, you haven't missed anything.

Simon

tourer · 9th September 2022, 14:34

Any updates?

4th May 2022, 12:08	#83
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,765 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Remove throttle body and access the thermostat that way, I doubt the garage would have done it that way though as they don’t sound competent enough! __________________ Lest we forget..

3rd June 2022, 06:40	#89
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,344 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	I'm still in touch with Lida Jon and no, you haven't missed anything. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

3rd May 2022, 20:16	#82
lida Regular poster Rover 75 Tourer 2.5 V6 Join Date: Feb 2014 Location: West Middlesex Posts: 63 Thanks: 48 Thanked 11 Times in 6 Posts	Thanks to Simon for posting this update. A drive starts off well, and Simon was optimistic that this gremlin had gone. But from my drive to his this morning I too got my hopes up, and of course it turned out to be a flash in the pan. There appears to be no correlation between speed, gradient and coolant temp. In fact, Simon remarked today that he would have expected the temp to reduce when driving briskly, but in fact (sometimes) temp fell to normal range when driving at just below 30 mph. I'm throwing out this puzzle to anyone interested to solve it. Today the coolant level was just a bit higher than it has been in the last week. I know it suggests an airlock, but where would that have come from? If the thermostat is opening, closing and half-closing erratically, could that fault be responsible for creating enough turbulence in the coolant to create an airlock? On my way home, I reached 111°C, but a little later reduced to 92, then up again. The other thing I would be interested to find out is how the hell did the garage access the thermostat housing in order to fit another one? Looking around there is no evidence that screws or other retainers have been removed, and there's dust where you would expect it to be. Even with the air filter housing removed, and working sideways, it seems an unlikely route. Therefore, what is the famous 'sideways' approach?

4th May 2022, 13:20	#84
Martin Butler Loves to post Rover 75 saloon Join Date: Sep 2021 Location: St Leonards Posts: 352 Thanks: 46 Thanked 72 Times in 49 Posts	The garage may have fitted land rover parts, but its not unknown for a new part to fail straight out of the box, often with manufacturing defects, such as a malformed pin, or something, that prevents the item performing as intended, only way is to try another thermostat, see if that clears the issue, I would be very surprised if its an air lock because the system has been bled several times now.

4th May 2022, 13:38	#85
lida Regular poster Rover 75 Tourer 2.5 V6 Join Date: Feb 2014 Location: West Middlesex Posts: 63 Thanks: 48 Thanked 11 Times in 6 Posts	Thanks Martin. That's what I suggested to the garage. I think logically and, afterall, what new component could affect temp if not the stat? But it would have been another pile of money, because they were not willing to do at their cost. I don't know whether the following system exists, but surely a garage can cross-charge Land Rover for removal and installation of a new stat.

5th May 2022, 08:45	#87
lida Regular poster Rover 75 Tourer 2.5 V6 Join Date: Feb 2014 Location: West Middlesex Posts: 63 Thanks: 48 Thanked 11 Times in 6 Posts	ARCTIC. This is magnificent! Very well written and the photos are an invaluable guide. The bit that worries me is of course the throttle body, because spring-loaded bits & bobs, or brittle ones, may crumble or ping off never to be seen again - and then what do you do? If I do go ahead with all of this work to solve why my 75 is running hot and also giving erratic temp readings, and then we find that the thermostat is not the culprit, I wouldnt know where to go from there. Thanks again, this is a wonderful forum.

2nd June 2022, 14:10	#88
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	Was there a result to this thread ??--Have I missed it ??--

9th September 2022, 14:34	#90
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	Any updates?