Engine Coolant Temp Fluctuating

[CSteen85]

Very true and I do as well, but when those damn plastic elbows crack on you and you lose some coolant its a little strange to see the temp guage go up....no heat....go down......HEAT....drove me nuts till I got home and found the leak.

webracin

This is what is happening to me right now. If I am understanding this thread correctly, would replacing my upper and lower radiator hoses fix this problem?
My mechanic said I needed to have them replaced and I'm just wondering if this could be causing my heat inside the car to be going in and out and my temp gauge to be rising and falling a bit.

Is this right?