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Its not a difficult job, the only difference with a T4 and the link above is that you completely remove the intercooler on the T4. I used the carb cleaner, filled up the cooler and left it soaking for 1/2 hr before flushing through with soapy then clean water. ( you dont want any flammable fumes left inside) than dry it out thoroughly inside ( I used a hairdryer and the radiator overnight). Then reconnect and away you go. :ILU:
 

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I used white spirits and then an air gun to dry it out. Well worth doing, mine was utterly black and took 8 flushes to get it clean!!!!!!!!
 

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I didnt notice anything different but I had it out whilst doing another job so did it anyway. And I know its all spangly inside! :D
 
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