P38A Can't find pesky coolant leak....

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MrGorsky

Well-Known Member
Full Member
Posts
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Location
Buckinghamshire.
Morning All,

I've had an ongoing slight coolant leak for some time now.
Earlier this year I put a new water pump and replaced the valley gasket. I hoped this would be it, but no.
I don't mind topping it up every now and then, but I'd prefer to get to the bottom of it.

I can't see any obvious leak, so I'm going to have to look a bit harder.
Is there a dye ro something I can add to make the leak show up? Or would there be a loads of chalky depositis or something I can look for around the engine. It's not fast enough to show up as drops of coolant on the floor, so I suspect it's evaporating off the engine or something.
 
Coolant already has a dye that shows up with a black light/UV. Shine it around the engine bay in low light and you'll soon spot it!
 
Could be a pinhole in the rad that only opens enough when hot. Or could just be a joint that isn't quite tightened all the way. May just have to wait for it to get worse enough to see.
 
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