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If coolant is low, the heater will blow cool.. if coolant is low..if cant see a leak..need to have radiator pressure tested..or top off coolant and keep a close check and see how much your losing,that is what I would check first, if not low then I would check heater core as suggested
The 1998-2004 Cadillac Seville SLS use the 4.6 L LD8 Northstar V8 motor. As long as your replacement motor is the same as your original motor then it will fit perfectly
YOUR LOWER HOSE LEAK COULD BEEN WATER PUMP WEEP HOLE LEAKING.OVER HEATING PROBLEM COULD BE WATER PUMP GOING BAD.MAKE SURE YOU HAVE CORRECT AMOUNT OF COOLANT IN COOLANT SYSTEM.
Please check the radiator it may be leaking or there may be hole in the coolant container or the sensor is defective get it checked ..................................
Is the temp gauge high?Does the car blow white smoke?Check the oil and see if you have antifreeze/water in the oil.You may have a blown head gasket.Im assuming you have a norhtstar motor.
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