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Old 9th August 2019, 07:09   #6
SD1too
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Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

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Quote:
Originally Posted by Mr Toad View Post
I suppose it is either the relay or the resistor that is faulty. What do you think please?
Hi Martin. Is it a silver coloured resistor? If so, it will be that.
Quote:
You said previously that if the low speed fan is not working this is responsible for the coolant loss. Where do you think the coolant is going?
On a 2 speed system with a failed resistor the fan will not start running until the coolant has reached 112 degrees. Not only is that much too hot, it is only three degrees below the temperature at which the temperature gauge rapidly swings to the red line and you're officially overheating. You also run the risk of the expansion tank cap venting to relieve the pressure with consequent coolant loss which will probably leave little or no trace.

But don't get bogged down in theory Martin. You have identified a fault with the cooling system and it needs to be repaired immediately. You can then reassess the situation.

When the thermostat was replaced, who did the work? If you did it yourself, did you refill and bleed the system afterwards by raising the expansion tank and by following the MGR procedure exactly? If not, this can cause problems with coolant level.

Simon
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