Big overheating problem today! HELP! - Alfa Romeo Forum
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Big overheating problem today! HELP!

If anyone happened to be at the main set of lights in Aintree today at around 4pm.... that was my red 146ti with steam bellowing out from under the bonnet.

It was stop/start traffic and the temp needle was rising dangerously towards the 120 mark. Managed to get it on the side of the road to investigate. The expansion tank was boiling over spraying water everywhere. I'm not in the know with how cooling systems operate.... The hose leading to the radiator was red hot, certainly felt no water running through it, and the cooling fan never switched itself on. Does the water overheating suggest that the radiator is failing or what? I did lose a large amount of water, perhaps some kind of blockage somewhere?

Any help would appreciated, and a preventative measure would be good!

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Last edited by AlexB; 07-07-04 at 03:01. Reason: repeat thread
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Re: Big overheating problem today! HELP!

Sounds like the problem is just that the fan isn't kicking in. he system relies on the fan to keep it at normal temperature in standstill traffic.
It could be the thermostat, or even just a loose wire to the fan, burnt out fan motor, anything like that.
Maybe try running a current directly to the fan motor and see if it goes to narrow down the options?
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It sounds like your fan just didn't come on, so your car overheated.

I'd fill it back up with water and then just let it idle until the temperature reaches 95 or thereabouts - after that the fan should come on. If it doesn't, that's where the problem lies.

If the fan temperature switch is knacked you can wire it up so the fan is permanently on, till you replace it.

It sounds like everything else is okay as the temp was up at 120. If there was no water you wouldn't get a reading at all. If the system was not pressurising then the boil-over would have happened at 100.

I'd pressure test your system now though - you may have melted the head gasket.

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Re: Big overheating problem today! HELP!

Hi, try not to let the temp go beyond the pt when the red light on the dash pops on..

You may also want to give the radiator a thorough flush and see whether it overheats again. You can also check out the fuses, especially the ones related to the radiator fans. Also the fan relays. Not sure where these are located for the TI but an owner's manual will have all these info...
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Re: Big overheating problem today! HELP!

Two things come to mind... The water was boiling over at the 120 mark...? Well AFAIK the cooling fluid should have a boiling temperature of above 120oC, and unless your thermometer was incorrect, it was an incorrect mix of fluid to water ratio.
Otherwise, the 'boiling' per say, may have been an air lock.
When was the car last serviced? Who did it?
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When you do start the car again check that the top hose to the radiator gets hot as the engine does and if you have the M2.10.04 injection there won't be a fan switch in the radiator the ECU controls it.
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Re: Big overheating problem today! HELP!


ps. sorry about caps.

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