I have a 1995 Mercury Sable. I have replaced the water pump, the thermostat and flushed the cooling system twice. I have gone through every method I could find to eliminate possible air locks. Only once did the system operate correctly and that was during the cleanup right after a flush. The temp guage was reading about center and the heater was blowing heat extremely well. After draning the system and refilling with 50/50 it went back to the temp guage reading low (barely moving up at all) and the heater/defroster blowing hardly any heat at all. There are no leaks anywhere. What could be causing this problem of no (little) heat?
Sunday, June 26th, 2011 AT 1:16 PM