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24th June 2018, 01:55 | #1 |
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Rover 75 Connoisseur SE Join Date: Mar 2018
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Random Coolant loss
My 2003 75 (done 160,000kms) is losing coolant 'somewhere'. Sometimes I'll drive 100+ kms and the levels remain constant. Other time I might drive 20kms and find the header tank empty. I check the level regularly and, when the level drops, it rarely needs more than two or three cupfuls to refill the header tank. There is no discolouration of the oil. No smoke out the back. Not drips under the engine. I can see no sign of any leak anywhere. I thought at first it might just be airlocks (having flushed the system to clean out the heater matrix) but this is the third time the level has suddenly dropped. Any help or guidance would be appreciated. Thankyou
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24th June 2018, 09:18 | #2 |
I really should get out more.......
Rover 75 connoisseur se v6 auto Join Date: May 2014
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Not a V6 driver but when i have unidentified coolant loss - i get my local garage to put her up on a ramp and run a coolant pressure test - in the past this has helped spot a failed IMG and a failing turbo hose. In the case of the IMG leak it took 2 hours to manifest itself on the ramp - engine had to be at a temp were expansion took place. With the IMG leak the only symptom was losing coolant and i only picked up on it initially as my fan was running after i parked up and normally this would not happen.
Also failure of the coolant plastic hose and thermostat O rings in the V6 have been widely reported - but generally the coolant pools in the V of the engine.
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24th June 2018, 10:41 | #3 | |
I really should get out more.......
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26th June 2018, 03:08 | #4 |
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Thanks for your advice but, sadly, no reliable trustworthy garages close to my place. If I can't find the problem, then I guess a bit of travelling to get it all checked out may be necessary
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26th June 2018, 03:14 | #5 |
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Interesting point. Of course trying so see the level isn't that easy either. But, using a measure, it does appear that it might be overfilled. I've been using top of the molded tabs on the inside of the tank as a guide but note that to be higher than the maximum level stamped on the outside of the header tank. Yesterday my drive took me 80kms and I noted a slight drop in level. From what I can tell, the maximum level appears to be almost the bottom of the header tank. Is that right? Does the high mark refer to when the engine is hot and the low mark when it is cold? I did read on one of the posts that these cars do tend to use a bit of water. All very confusing for a novice like me
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26th June 2018, 06:29 | #6 |
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It's worth re-visiting the air-lock idea. Unless you re-fill these things absolutely by the book then air can hang around in the system for ever and a day. Another possibility is a small leak close to something warm, meaning any escaping fluid evaporates before it gets the chance to drip. I've had them both and they can be really trying before you get to that slap on the head and "ahaaaaa!" moment.
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26th June 2018, 10:07 | #7 |
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Hi Pieter
photo below of the level you should be looking for in the coolant tank. First photo is a little low to show the step inside the tank, second photo is how it should be also check the O-rings on the coolant cap if they are flat and not domed shape they need changing, use Viton ones. Arctic
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26th June 2018, 22:45 | #8 | |
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26th June 2018, 22:53 | #9 | |
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27th June 2018, 09:08 | #10 |
Doesn't do things by halves
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Pieter,
Renewing the expansion cap seals on my car stopped persistent small variations in coolant level. These seals become compressed after many years' service so I would recommend renewal. After your work to the heater matrix did you refill the cooling system using the official MGR method which involves raising the expansion tank? Have you looked into the 'V' to check for a leak from the 'O' ring seals there? Have you performed the 'demist test' to check that your radiator fan is operational on the slow speed? Simon
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