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10th February 2015, 18:47 | #21 |
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Rover 75 CDTi, 2x MG ZS180 Join Date: Jun 2011
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It sounds to me like a blockage somewhere - explaining why short, slower journeys are OK but a larger thermal load is causing an overheat.
I'd start with a full coolant drain, flush and check the radiator and heater matrix for flow - finally, bleed properly when refilling (which is an art in itself).
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10th February 2015, 19:37 | #22 | ||
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Peer through the radiator grille at the fan shrouding. Can you see a silver rectangular resistor with a wire at each end mounted at the two o'clock position? Please report back. Simon
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10th February 2015, 22:00 | #23 |
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This is what you're looking for (I cheated in this picture as I already had the front bumper off.
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10th February 2015, 22:23 | #24 |
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13th February 2015, 22:24 | #25 |
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Hi again sorry I have not been around but had to work.
Drove today for about two hours without any problems at all?? Is it the new thermostat that was put in(has it kicked in?) I don't know but I was in town traffic very slow then duel carriage way for a bit then slow traffic again, I tested the temperature when I got home and it said 90. Don't know what's happening but I will keep you in touch and once again thanks. Tom |
13th February 2015, 22:53 | #26 |
Doesn't do things by halves
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Tom,
As you cannot see a resistor and your car is a year 2000 model, you probably have the original 2 speed 3 brush fan motor. Your previous evidence (cyclic operation) indicates that one of these brushes has worn down to its minimum length. This means that instead of your fan running when the engine reaches 104°, it won't run until it reaches 112° which is much too hot for comfort on any engine, particularly the 1.8 litre. Not only that, but because only two brushes are operational the motor will run only at slow speed. MG Rover designed the system to run at fast speed at this temperature. In short, by continuing to drive your car you are putting the head gasket at risk and sooner or later the worn brush will fall out of its holder, enter the rotating motor armature and cause terminal damage. Your engine will then overheat and you will break down. Tom, you must act now. If you are sure you have no resistor then you need a replacement fan system. Club member Arctic will help you with this. I'm afraid that ignoring the evidence and crossing your fingers is not very sensible. Simon
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14th February 2015, 00:46 | #27 |
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Hi Simon, Thanks very much I will get a replacement fan system.
Tom |
14th February 2015, 11:50 | #28 |
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Hi Simon, I have just looked at the fan and I have noticed from your picture that where the resistor goes' I have the bracket there for a resistor to go on but no resistor?? Any ideas if this is the two speed or three?? if its the two how do I go about putting a resistor back on?? sorry for my ignorance.
Tom |
14th February 2015, 12:15 | #29 |
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Hi Simon, just seen a picture of the three speed fan and it looks like that's what I have, I will contact Arctic as soon as possible.
Cheers Tom |
14th February 2015, 13:13 | #30 | |||
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Simon
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