please solve overheating problem (honda civic)?

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slee1

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I drive a 2002 honda civic si-coup.
When I drive long distances (20-30 KM) and then hit a sudden stop (brake) The thermostat on my car starts to rise, sometimes almost going to H. The temperature increase is sudden, as soon as I stop, after driving long distances , it begins to rise, it takes less than a minute to get one click away from H.

When this happens the heater stops working and begins to blow freezing cold air. (which makes no sense because the thermostat says its overheating).However there is no visible steam comming out of my car.

I've gotten it checked out at my local mechanic and he doesnt know what the problem is, because he can't get it to overheat in the shop, since I have to drive long distances for it to overheat. He has checked the cooling system entirely and everything is working as it should be, there aren't any leaks in any hoses, everything is working just fine.

When my car does this, and I take it into the shop they fill it up with coolant and i'm "fine" for a couple weeks or so. However, this doesn't really make sense, because the coolant shouldn't be dissapearing...if its not leaking out of a hose or something, right?

Please help me figure out what is wrong with my car.Why is it overheating?
 
Sounds like you need to find a new mechanic . this is engine repair 101. overheating with out visible steam first thing to check the oil if it looks milky almost like a chocolate milk blown head gasket. second indication of a blown head gasket loss of coolant in to the engine rather than the ground.
 
could be going out your tail pipe..or you have a small leak that running down the motor and back only when your driving it so you don't see the leak..might have air pocket..i think its a flush/radiator/ or a head with a pin hole leak...have you ever added any stop leak to the radiator.
 
could be your fan for the Radiator it could be burnt out or not connected or the sensor is bad have him check all of that.
 
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