4 or 6

[mcgarrett]

Seems to me Brent & Dan are right on target with their comments. I live in Texas, which is synonymous with HIGH summer temperatures. I had a cooling problem much like the OP had and found my original radiator was causing most of the trouble (clean radiator or not) due to fins not making good contact with the tubes. I tried both 2 blade and 4 blade fans to no avail. I then replaced the radiator with new Brassworks unit and temperatures were back under control.

Here are some suggestions of things to check if you haven't already...

1) Check for bubbles in the coolant when the engine is running (remove radiator cap and observe). If you notice bubbles it's a pretty good indication of a blown head gasket.

2) Remove the restriction or thermostat from the upper hose (they were NEVER installed at the factory for any reason I know of) it will not help with cooling.

3). After driving in hot weather long enough to get the engine temperature up, shut the car down and listen for any signs of boiling, gurgling. or steam coming from the engine. If the coolant is at the proper level check to see if any is coming out of the overflow tube. If the radiator is spitting water on the ground your coolant level is too high or you are overheating due to a radiator that has exceeded its service life - or perhaps suffering with issues found in points 1 & 2 above.

4) Replace the anti-freeze/water mixture with 100% water and a corrosion inhibitor additive like Water Wetter or 40 Below. For winter driving, switch the coolant mixture back to 50/50 antifreeze and water.