Toyota is fixing the pumps that cool the hybrid system in 650,000 Prius cars — the automaker's prized environmentally friendly vehicle — but is adamant the repair being carried out worldwide isn't another recall.

Toyota Motor Corp. spokesman Paul Nolasco said Tuesday the coolant pump in Prius cars for model years 2004 through to 2007 is being replaced because it doesn't work properly.

The automaker is calling the move a "customer satisfaction campaign" because the problem doesn't warrant a recall under regulations where the vehicles have been sold, according to Nolasco.