It's the sound of money being chewed and swallowed!
Have a look and see if you are getting soap suds in your oil, or a smell of fuel in your water!
Then check around your core plugs to see if there are any traces of running water.
Keep everything as simple as possible, without stripping the lump unless you have to!
 
no suds in oil, no smell of fuel in water, and no water running, no signs of water loss at all just the drop in levels
 
You say it's 'behind the dash'. Does that mean in the engine bit or underneath you in the gearbox bit?

What is your engine oil pressure like? Do you have a noisy oil pump?

Have you checked your gearbox oil levels?

Are your fan and PS belts properly tensioned?
 
behind the dash not underneath, from other forum descriptions it sounds like air in the heater matrix, where or how it is getting in is the mystery
 
behind the dash not underneath, from other forum descriptions it sounds like air in the heater matrix, where or how it is getting in is the mystery

Possible that the matrix wasn't bled propper when the rad was done ...

and that is 'self-bleeding' now he's turned the warm up ...
 

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