MGF overheating
Discussion
I used to own one of these, a 2000 model, and it overheated a few times(probably why it was at auction!) but didnt damage anything. 
I was told it could be the wiring on the rad fans are the wrong way round, so it sucks instead of blows or the other way round I cannot remember. Both wires are the same colour.
I swaped the wires around and replaced the rad expansion cap and it was fixed, but I have since done some googling and found nothing that mentions this. Was this info rubbish?
I was told it could be the wiring on the rad fans are the wrong way round, so it sucks instead of blows or the other way round I cannot remember. Both wires are the same colour.
I swaped the wires around and replaced the rad expansion cap and it was fixed, but I have since done some googling and found nothing that mentions this. Was this info rubbish?
Both are possible problems on a car
Changing the cap can do no harm provided you checked that you replaced it with the correct type and not just copying the one that was on it before which could have been wrong (doubtful)
Fan (fans?) wired the wrong way (doubtful again) - be careful they may appear to work during the cold weather - check the fan(s?) is working in the right direction by getting it to operate and check that the cold air is going thro' the rad in the right direction
Changing the cap can do no harm provided you checked that you replaced it with the correct type and not just copying the one that was on it before which could have been wrong (doubtful)
Fan (fans?) wired the wrong way (doubtful again) - be careful they may appear to work during the cold weather - check the fan(s?) is working in the right direction by getting it to operate and check that the cold air is going thro' the rad in the right direction
On the F the rad cap can fail, which means that the system is not pressurised as it should be, but this doesn't necessarily mean that it will overheat - it just lowers the temperature at which the coolant boils and you start getting steam coming out of the cap!
The system has two temperature sensors within the coolant pipes in the engine bay. One simply feeds information to the temperature gauge. However, the other sends its signal feed to the ECU - this then turns the fan on when the appropriate temperature has been reached (102 degrees) and turns it off when it drops (to 96 degrees). If this one fails, it effectively creates an open circuit and just tells the ECU that the engine is permanently hot, and the ECU as well as switching the fan on tells the fuel system to dump more fuel in because it thinks that the engine is cold. It is unusual (but it failed on mine) and you get the temperature gauge telling you that all is well with the world, but the main radiator fan is on virtually permanently once the engine has warmed up from cold and fuel consumption increases. More here -http://www.mgf.ultimatemg.com/
MG Mark
The system has two temperature sensors within the coolant pipes in the engine bay. One simply feeds information to the temperature gauge. However, the other sends its signal feed to the ECU - this then turns the fan on when the appropriate temperature has been reached (102 degrees) and turns it off when it drops (to 96 degrees). If this one fails, it effectively creates an open circuit and just tells the ECU that the engine is permanently hot, and the ECU as well as switching the fan on tells the fuel system to dump more fuel in because it thinks that the engine is cold. It is unusual (but it failed on mine) and you get the temperature gauge telling you that all is well with the world, but the main radiator fan is on virtually permanently once the engine has warmed up from cold and fuel consumption increases. More here -http://www.mgf.ultimatemg.com/
MG Mark
GTIR said:
Ok thanks.
Well all I know is that the car got very hot and the fans were blowing the wrong way and I swapped them over, problem fixed!
Yeap you can't always trust the previous guy's (or gal's) workWell all I know is that the car got very hot and the fans were blowing the wrong way and I swapped them over, problem fixed!
GTIR said:
Anyway, no VVC = no point in getting a MGF IMHO. 
IIRC I was told the non-VVC was more tuneableI prefer torque over revs personally
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