I have a Mercury Sable 1999, v-6, with 94,000 miles. My car overheats only when the brakes are applied and sitting idle or when the air conditioner is on for awhile; however, if I put the car in park it will not run hot. I have had a new water pump put on, thermostat replaced, hoses checked going to radiator for leaks, new reservoir, and the fans are coming on. I do not believe it is the heads because then it would be running hot at all times. Please help before I have to spend a fortune on my car. It has been checked out by Firestone who could not diagnose the problem.
Monday, May 22nd, 2006 AT 12:54 PM