MGF Coolant Leaking - White Smoke From Engine Vent

You need a new cap for the coolant expansion tank. Halfords do them, but be SURE it's the right one.......they have a habit of getting it wrong. It's common fault, so later, get over to ebay and get a couple of spares. For furure help, go here.....

Srabbani, I'm concerned you haven't replied. Running your F as it is is a no-no!!! My 'repy to' is valid if you want to mail me.

Pete, thanks for the advice. Digging a little deeper into the issues particularly around the temp rising when idle, I found the following link on the web:

-- Shuaib

Unlikely. Coolant cap...............less than a fiver. It's a common and well known fault, the symtoms of which you describe exactly. Go to the link I gave you and ask there. A tenner says you'll get the same answer. :)

Pete

Will certainly look into getting a new coolant cap. In the meantime can you help me understand why a faulty coolant cap would cause the engine temp to rise to max and also why it would cause the coolant itself to boil in the expansion tank.

Regards

Shuaib

Pete C wrote:

Pete

Will certainly look into getting a new coolant cap. In the meantime can you help me understand why a faulty coolant cap would cause the engine temp to rise to max and also why it would cause the coolant itself to boil in the expansion tank.

Regards

Shuaib

Pete C wrote:

Temp is rising because the coolant is no longer under pressure and cooling. The valve in the cap fails which means coolant boiling at approx 100°C instead of around 120°C under pressure.

Thanks - will follow your advice this weekend and keep you posted. Many thanks for the info.

-- Shuaib

Your welcome. Please let me know how it goes :) And join the forum I gave link for.......... costs nowt :)

Pete - Bought a new coolant cap. Unfortunately, the same symptoms. When the engine is warm and the car is left idle for about 10 mins, the temperature starts to rise towards hot.Coolant bubbling.

Assuming there is a radiator fan beneath the front bumper - but even listening carefully I can hear nothing from this area of the car. Can I assume the ECU sensor or radiator fan is the culprit?

Looks like I need to take the car to a specialist. :(

Regards,

-- Shuaib

Fuses : Under bonnet No.2 Under dash, drivers side No.6 Not sure which of these is rad. fan. Beyond that, I wouldn't like to say. I'd suggest you ask in

Hi Based on the syptoms my guess is a bad head gasket dumping cylinder pressure in to the cooling system.

Don snipped-for-privacy@sbcglobal.nettt

Okay an update. Took the MGF to Fisher MG specialists (very helpful by the way). The ECU temp sensor was faulty (now replaced) and the connections to the radiator fan were also loose. The car is now A okay

- no more overheating. Thanks for all the feedback - all very informative.

Regards,

-- Shuaib

Thamnks for posting back. Glad all is well now. BTW, where Is Fisher ? :)

They're in Sydenham, SE London.

Thanks :)

hi please help. i havent started my mgf 97 for some time i was havingstarter problems.. it was left out doors for some time, so i tried starting it today and when the engine ran there was a bad smell and a lot of smoke came out of the back engine area. when i turned the engine off it was ok but i am very worried now. can any one help me on this one please text 353876459339 liam snipped-for-privacy@hotmail.com

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