RPB

hi guys new to your group and looking for some technical help. I've owned a 2004 S Type for about 7 years with out major issue. I have what is a minor coolant leak at the duel climate control valve, at the moment it could only be referred to as seepage. Needless to say this needs to be repaired. My question is has anyone replaced this valve specifically on a vehicle with a 4.2 litre engine. I need to find out the best access to get hands on the valve. This area is compromised for hand space, The workshop manual shows access through the front gard arch but can,t see that as an option. any advice in with this problem would be greatly apricated