Northstar Engines and System Technical Discussion Discussion, 2000 DeVille Overheating Update in Cadillac Engine Technical Discussion; I changed the thermostat, old one was bad, it didn't budge when I put in hot water. The car still ...
I changed the thermostat, old one was bad, it didn't budge when I put in hot water. The car still overheats. My mechanic told me to add 3qts of radiator flush to the system and run it for a couple of days he told me he had seen this problem before and a clogged radiator was the problem. I added the flush last night.
I put the car on the road this morning and now it overheated and high revs would not cool down. I think that the flush loosened up more gunk and that debris has moved to the clog point in the radiator and just completed clogged it.
I'm going to get a flush and see if that will push the clog open.
If not i will have to get a new radiator.