mack1

Hi fjalvarez,

I'm wondering if you are giving the fan too much credit for cooling the engine. Does the temperature stays up when you are driving down the road. On older vehicles you could run without fan belt and it wouldn't overheat until you stopped at a red light.

I'd recheck the thermostat making sure it would open up in hot water on the stove. I'd also at least use a garden hose to flush and back flush the radiator. You could also flush the engine while the thermostat was removed.

Does anyone know what the temperature should be when the fan is told to come on. I'm wondering if 225 could be the normal setpoint. I'm also not sure that the water will boil at 225 if the radiator cap is holding it's 15 psi. Water under pressure boils at a higher temperature than 212. In my mind, I would think that the low speed would come on at a lower temperature and that the 225 would be for the high speed. You might have a wiring problem. Has anyone worked on the wiring?

Just some thoughts and suggestions before you replace the heads and PCM.

Very best regards,
Mack1