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12th January 2020, 17:25 | #11 |
Posted a thing or two
MG ZT-T 2.5V6, Mazda Cx30 Join Date: May 2011
Location: Greenford
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I had a problem for months with dropping coolant levels to the point the i was getting really concerned. No obvious leaks and even got my garage to pressure test the system and came back ok. Would top up check a phew days later and coolant gone from the header tank had to put in quite a lot to bring back to the max level on the header tank. With the help and patience of the members it turned out to be an air lock in the system. Now that it has been cleared the level has stayed consistent between levels in the header tank.
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Ugly Duckling |
16th January 2020, 07:36 | #12 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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Quote:
An excellent point Charlie, I had forgotten that one. Martin; has your cooling system been drained and refilled recently without using the proper MG Rover procedure? Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
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21st January 2020, 12:52 | #13 |
Gets stuck in
Rover 75 2.5 V6 in Wedgwood Blue Join Date: Dec 2015
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This may sound daft but the smell of OAT is pretty unmistakeable. Get the car out of the wind and preferably in an enclosed space, stick your nose under the bonnet and have a good old snuffle. If there's a trace of it in the V you'll notice it (particularly with a slightly warm engine).
Secondly please remember that a lot of the points with the greatest potential for coolant loss are a) difficult to see and b) warm, meaning that your evidence is going to be nothing but a pink stain and will be hard to see. Hence the usefulness of the sniff test. Thirdly, based on my own experience if it's not the thermostat O-rings, the thermostat straight pipe, the inlet manifold, the radiator or the plastic elbow on the radiator it's likely to be an air lock. Some of the coolant channels inside the engine are extremely narrow (hence their susceptibility to clogging with RadWeld and such) and can take a long time to give up any air that enters.
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