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this may be a goofy question BUT do you mean flushed the radiator not the heater core. Heater core is on the firewall.
Check the hoses going into the heater core to be sure they are both hot after the car has reached running temp. This will let you know if you have a blocked heater core not radiator.
hi if on engine starting and warmed you have no problems and no warning/malfunction light showing ? then i would suspect that trouble points to the engine coolant temperature sensor it tells the ecu to provide excess/choke to simplify? fuel as engine is cold so in simple theory you are trying to start with no choke as it was on old carburettor engines if you are old enough to remember ?? (joke) it was much simpler in those days however check the sensor and its plug is clean/secure and wires are ok ? when sensor works your engine fires up and runs withslight increase revs till warmed then settles to idle revsas specified in h/book this sensor is not the temp sensor that works the temp indicator guage it is a seperate sensor and larger screwed into either cyl head or block on the side hope this helps good luck
If the engine is not over heating then it is doing its job. The constant cycling is based on the temp of the air traveling through the radiator and the a/c condenser not the outside temp so much. The start up high rev is just how these clutches work in ford fans. It sounds like it is operating correctly.
Check to make sure your thermostat works right by monitoring the warming up of your engine. With a completely cold engine, start and run the engine for a few minutes, then put your hand on the top radiator hose to monitor if and when it gets warm as the thermostat opens more and more and note the gauge reading( if it works) the top radiator hose should be unbearably hot within 5-8 minutes. If the therm. opens right it should close right aswell, staying open a little while eventhough the radiator may have cooled may be what you are experiencing causing the rapid cooling and is nothing to worry about. The Hose should not get warm very soon after starting the engine. Regarding you gauge, lets take one step at a time, verify proper op. or the therm.
Sounds like faulty engine temp sensor. When it drops to cold, the engine control unit picks this up and alters the fuel mixture accordingly. The ECU will be making it a very rich fuel mixture for cold starting, hence very poor running when engine is hot.