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8th February 2009, 17:33 | #1 |
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MG ZT 1.8T coolant loss
Help please. I have a 2003 MG ZT 1.8T which has decided to lose coolant once engine is turned off. Cooling system appears to be over pressurizing and the cooling fan appears to not come in anymore.
Car has had 3 HGF tests all of which were negative. 2 garrages have had 6 looks at the problem with both saying they cannot get the car to replicate leak and or get the engine hot enough to have cooling fan cut in!! The casr was perfect until it had service 6 months ago when the MGR garage flushed out cooling system as part of service. It has leaked ever since. I am going nuts...............Please help if possible. Lotus7 |
8th February 2009, 17:39 | #2 |
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One favourite leaky spot is the plastic T-piece just behind the radiator at the top. Check the pipe dropping down to the PRT. You'll see pink staining if the joints are leaking. If so, replace the silly clips with Jubilees and retighten carefully. If that don't work think about commisssioning a GerryTee.
As to the fan, what year is the car? |
8th February 2009, 18:03 | #3 |
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Welcome to the forums David,
Sorry to hear about your problems. Where about in the country are you located as few have some good garages and members around the place that could offer some help. |
8th February 2009, 18:30 | #4 | |
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Thanks, coolant appears to leak from 3 areas depending on length of drive. Short drive = t - piece/ little pipe running down from it. Medium drive (10 miles +) = from T piece and the top hose as it goes into the top of the radiator. Long drive (Motorway) = from t-piece, top of radiator and I think from the expansion tank as a couple of times I have seen coolant on the air box cover.
The amount of coolant loss is minimal, maybe 1/2 litre (max) a week (car is used daily). The car is an 03 plate. Also, where is the temperature sensor for the fan/temp gauge so I can check/clean terminals to see if this makes fan cut in. Quote:
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8th February 2009, 18:30 | #5 |
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8th February 2009, 19:32 | #6 |
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The temp sensor is on an alluminun housing on the right hand front corner of the cylinder head as you look under the bonnet. If the connector is disconnected with the ignition on the fan should run - keep you hands well away from the fan :lol:
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8th February 2009, 19:42 | #7 | |||||
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Hello boys! |
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8th February 2009, 21:15 | #8 |
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Thanks for the pic and the info. I have a 2 speed fan which works fine when Aircon/climate is turned on.
As for too much of a leak - yep you are right, however 1 drop is too much. In saying that, car has now done 7000 miles with the leak, so you can pretty much guess how frustrated I am with the problem. And yes, the expansion cap is brand new. Cured problem for all of 3 days!! Just a silly question. Is there a way of making the fan cut in permanently to see if it is actually working? Thanks for all of your help. David Any clues |
8th February 2009, 21:37 | #9 |
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8th February 2009, 21:46 | #10 | |
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If you detach the sensor wiring, the fan should trip into emergency high speed cooling mode. It sounds like the sensor or its wiring is faulty. Have you run the coolant temperature diagnostics to see what it says? See: http://www.the75andztclub.co.uk/foru...ng+temperature |
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