Coolant Leak Test? - Alfa Romeo Forum
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(Post Link) post #1 of 4 Old 10-02-15 Thread Starter
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Coolant Leak Test?

So I just got back from overseas and opened my bonnet to check the oil and coolant levels before I took her out for a journey and noticed that the coolant leaked whilst I was away (from Max -> Min over the 10 weeks I was away, so its not pouring out. And yes it was driven by my brother whilst I was away).

The weird thing though? Its sprayed all over the engine bay around the thermostat and on the surrounding hoses. I suspected before I left that one of my hoses may be poorly connected or the temp sensor wasn't secured enough and as such, when the coolant started flowing a very small amount was spraying out under the pressure, however I was unable to find the source of the leak and it was so small that it never really bothered me.

However now that I am back and my engine bay looks like someone bled all over the place (red coolant) I want to finally get round to finding the leak and resolving the issue once and for all (along with an engine bay clean up).

So my question is, how do I find the source of the leak? I have tried getting the car up to temp then leaving it on the drive with the engine running (its 38*C outside) with the bonnet open in the hope that I can see where its coming from. However this hasn't been very fruitful for me. Therefore, is there another way I can pressure test the system without paying a garage or having to buy expensive equipment?

FYI the radiator is 100% with no leaks or any evidence of leaks anywhere to be found. Thankfully the weather here is very kind to rads and its in tip-top shape. So its definitely a hose connection or the temp sensor or maybe even the thermostat itself (which was replaced about 6 months ago).

Any help would be appreciated in helping me find the culprit!

2000 Alfa 156 Sportwagon 2.0 TS CF3

2002 Alfa GTV 2.0 TS CF3
1983 Porsche 944
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how i found mine,

wait until its dark and tun your engine on and get it up to temperature. then use a small touch to search for steam.

I had a tiny pin hole i would have never found but upon shining a touch over it showed a little injection of steam coming out.

My v6 has a coolant leak but that is more obvious as it from the tank/coolant cap

Last edited by jonalfaspider; 10-02-15 at 23:36.
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(Post Link) post #3 of 4 Old 10-02-15 Thread Starter
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Will give that a shot tonight. Proving to be a right pain in the arse to locate
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Sounds very similar to an issue I had last year that I posted about. For me it was the hose from the stat to the bulkhead for the heater matrix. The rubber breaks down and can no longer provide a good seal even under compression from the hose clip. Look here as a starting point I would say.

When I removed mine, the rubber was very soft at the stat end. Have a look at yours when the engine is cool. It could just be the clip has weakened. If it's the hose then it's a bugger to get off the bulkhead (would recommend removing the plenum first for access).

Or it could be something else entirely but it sounds very very similar!!

History - 1999 156 2.0 TS - 1999 GTV 2.0 TS - 2000 GTV 2.0 TS, 2000 166 2.5 V6 24V - 2002 147 2.0 TS - 2004 147 2.0 TS
Current - 2001 Spider 2.0 TS, 2006 Jaguar XK8, 2006 VW Golf GTi
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