2005 Land Rover Freelander Complaints

I BOUGHT 2005 LANDROVER FREELANDER JANUARY 27TH, 2006 WITH 3770 MILEAGE AND ABOUT A WEEK LATER, CAR WAS OVERHEATED AND STEAM CAME OUT FROM THE ENGINE. DEALER SERVICE CENTER SAID COOLING FAN WAS NOT WORKING, SO THEY CHANGED IT,AND EVERYTHING WILL BE OK, BUT YESTERDAY MIDNIGHT, CAR GOT OVERHEATED AGAIN CURRENT MILEAGE IS ONLY 5400. I GOT STUCK ON THE FREEWAY WITH STEAMY ENGINE. SERVICE CENTER SAID THEY WILL FIX IT, BUT I CAN NOT FEEL SECURED TO DRIVE THAT CAR. I COMPLAINED THAT AND TRY TO GET REFUND SINCE IT HAS BEEN ONLY 3 MONTHS, BUT THEY SAID THEY CAN GIVE ME 5000 LOWER PRICE THAN THE PURCHASE PRICE. WHAT CAN I DO? I CANNOT GET A FULL REFUND? *NM