Hello all.
Quick update for you all.
Made enquiries with Lexus Manchester and Lexus Stockport about possible faults and solutions.
Lexus Manchester very helpful but quoted over £700 for a radiator change, quite steep as they claim the part costs £450 when in fact it's available online for around £150.
Lexus Stockport were there usual unhelpful, disrespectful and patronising self, claimed the radiator and heater matrix were the same part! Member of the service department confessed he didn't know the difference between either!
Nobody could tell me how the matrix is plumbed in, ie compression fittings, flange, push fit with O-rings etc.
Quite unbelievable!
In the end they called me back and quoted over £1400 for a heater matrix change and the same as Manchester for the radiator.
Manchester could fit me in this week Stockport didn't know when!
Stripped down the front end myself and found a tiny crack weeping from the radiator on the bottom edge, drivers side.
Think I'll change it myself, as I've lost all faith in the main stealers, highway robbery simple as that.
Shame as the car has been quite good otherwise.