1999 Cadillac Deville. Digital coolant temp reading on the dash perfect at about 190 degrees. If I sit at a long red light or just creep along in a traffic jam, the coolant temperature will go as high as 220-224 degrees. Is this normal? How high can the coolant temperature get before I need to worry about blowing a head gasket?
Wednesday, May 4th, 2011 AT 3:02 AM