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Iratic Idle After Rad Changed

  Ph2 172 (black bean)
Had the rad changed on my 172 last week and now the idle has got a bit pete tong. When cold it can rev at 2000rpm and then drops to settle at 1100rpm. Even when the engine has warmed up it will sometimes bounce between the 2 levels. Other than that the car is running fine and starting OK.
  a thirsty one
is there a temp sensor on the rad which may have been damaged, just a guess as never changed the rad on a clio.