Overheating situation on 75 450SE. No oil in coolant, or coolant in oil. No steam from exhaust. Radiator is warm all over, but lower line doesn't get all that warm, or hot, even, in spite of the fact that the boiled thermo opens. Not sure of the temperature setting on it, so was going to get a new one and install.

I was considering doing this, but only because it worked on a Ford I had a while back. Tell me what you think....

Remove thermostat, and reassemble housing WITHOUT thermostat, refill with water but also put in a radiator flush of some sort like Prestone. Run it for the specified length of time according to Prestone, empty completely, install new thermostat, and fill.

I may get a rash of responses as far as how stupid this may be, but go ahead, I haven't done it yet. Also, should an over the counter (Non-Dealer) radiator flush be used at all?