I'd start by replacing the hose clamps with proper ones. Also have a look and make sure it isn't the matrix itself that isn't leaking..
Today I while doing a oil change on the Defender I noticed a small amount of coolant on the passenger side chassis rail , After some investigation I noticed it was coming from the heater , Looks to be the valve . It’s not a huge amount it’s about a drip every few seconds. I can’t tell where it’s coming from but it may be coming from around the hose clamp its forming a drop at the bottom around the mounting screw. Is there some sort of issue with these units? Do I just replace it or is it something simple like a loose clamp. It only happens when i turn the heater on hot .

I'd start by replacing the hose clamps with proper ones. Also have a look and make sure it isn't the matrix itself that isn't leaking..
Hercules: 1986 110 Isuzu 3.9 (4BD1-T)
Brutus: 1969 109 ExMil 2a FFT (loved and lost)
have a read
Part leaking on Puma
Jason
2010 130 TDCi
Ok so today I fitted a S/S hose clamp to the valve leaky hose and the problem has been solved . thanks all for the help .
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