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Discussion Starter #1
Got back to the car this morning to find a good puddle of coolant under the passenger side.

Couldn't see where it was coming from so I topped up the coolant and started the engine...

Nothing, no drips.... what the hell????

Drove around all day (about 30/40 miles)

Got home and still no coolant loss....

Anyone had something similar?
 

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Unlikely the aircon is running if it's anything like as cold as it is down here. Brrr!

Sounds like slight weep from somewhere that might have closed once it got warm. Can you put newspaper under it to narrow down where it's leaking form?
 

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Discussion Starter #4
Deffo not aircon, the coolant tank had lost about a litre.....

I've been trying to keep an eye on it... very strange.
 
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Could it be temperature related? As in has it been fookin cold, and you have a joint somewhere that is a bit iffy, has contracted and leaked. Top up, drive off and the car has warmed up so it expands again and no leak for a while.
 

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mine was leaking drops of coolant then not long after radiator hose split while driving, sprayed everywhere. check hoses for any small slits
 

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Discussion Starter #7
Adam, it must be temperature related I think..

Bundi, all the hoses are new silicon hoses so no splits...
 

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Mine was leaking from the thermostat seal (or whatever you call it) before Christmas and was definatly temperature related, could be where yours is coming from, Joe?:)
 

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Could be that dodgy 90 degree elbow join where the lower coolant hose joins the rad?
 

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just had something similar happen to my 147 GTA, dealer could find no evidence of where it was leaking, but the overflow tank took around a litre to top up, he had it up on the hoist, undertray off, then had me drive it around for a while, come back and still no sign of a leak, but I found a small puddle under the RHS wheel dripping from the undertray.
 

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Got back to the car this morning to find a good puddle of coolant under the passenger side.

Couldn't see where it was coming from so I topped up the coolant and started the engine...

Nothing, no drips.... what the hell????

Drove around all day (about 30/40 miles)

Got home and still no coolant loss....

Anyone had something similar?
Mine sprung a leak from the bottom rad hose where it joins the plastic elbow on bottom rad hose wasn't bad but enough to create a little patch replaced the hoses ok now
 
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Usual suspects list as follows;

90 degree elbow joint bottom hose to radiator

The lower of the two large hoses that go to the stat can fail where it meets the stat

The solid pipe that runs across the front of the car at the bottom of the radiator corrodes and can leak.

The expansion tank cap can fail and allow vapour to escape over time leading to a drop in coolant.

There's a small bore pipe that runs across the back of the intake plenum from the expansion tank to (iirc) the stat. Check the outlet from the expansion tank hasn't cracked.

Water pump failed? - does it overheat?

Head gasket trouble?
 

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no overheating, metal impeller pump fitted 5 years ago, no tell tale drips, no nothing, the mechanics (alfa specialists) cleaned everything down, found a slight weep of oil from a rocker cover gasket, the only thing they found, but i lost a litre of coolant, and refilled it, driven around 50km today in heavy slow traffic, no issue or any further leakage . . .

weird, and worrying . . will be driving with my eye on the temp gauge for a while at least . .
 

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Thanks for that list of suspects Chris -- very useful. Since changing the stat on mine a few weeks back, I seem to be losing some coolant.. not a lot, but need to keep topping it up every few journeys.. but no sign of any leaking anywhere.. not aware of having the notorious lower radiator hose replaced yet.. but also considering the lower hose from bottom of stat you mention. Hoping it's not head gasket related ! Although Ned did mention my car had a lot of gunk in the expansion tank last time it was in.. we gave it a flush and doesn't seem to have got any worse at least..

Ah, its all fun .. I'm sure the track day will highlight any problems : ) Hopefully at the end of it mind..

Edit: I like the look of this one -- is it just a new cap? The expansion tank cap can fail and allow vapour to escape over time leading to a drop in coolant.
 

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Mine was leaking from the "blinding nut" (don't know how to describe the big cap that is on the block under the thermostat unit). It was leaking very slow and while the engine was hot the coolant rather evaporated. So could find traces only when the car stood for longer.
 
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Bizzarely im having the exact same problem and had the cooling system tested to a high PSI and guess what no leaks. I've also had the head gasket tested (litmus paper or whatever in the expansion tank) and no problems. Sorry to hi-jack the post but just so I can follow up what Chris155 suggested

Can all of the places you suggest be seen without a ramp to get underneath or removing components to see thermostat casings etc...

Update 31/05/2013 - I had the good luck of actually seeing the leak, leak and found that its water, not coolant. The drip comes down from the wheel arch lining rather than the undertray so wonder if this is similar to your problem?
 
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