sounds like you need a new heater matrix.
Make sure you have the correct thermostat in there, if it is set too high you will get that bouncing. The thermostat is set to open at a certain temperature and allow the coolant to exchange with what is in the radiator. Under normal conditions you will notice a rise and fall of the temp gage as the coolant reaches max temp then lowers after the exchange. An overly sensitive sensor or an aftermarket gage set up will exaggerate it. I would not worry too much since it is a good indication that your cooling system is working well, the coolant in the radiator certainly seems to be cooling down enough to cause a big swing in temp. Check on that thermostat though as it may be letting the coolant get too hot before releasing it.
Nothing to do with the thermostat, everything to do with changing the coolant on the recommended* basis (or sooner). The "green" coolant is NOT long-life and recommended to be changed more often than the "yellow". But even the 'long-life' requires changing no longer than 5 years. NOTE: Both these coolant types are mentioned in the Owners Manuals.
It sounds like you have a blown head gasket. Combustion gases can enter the cooling system through either a blown head gasket or cracked cylinder head. The gases (under pressure) force coolant out of the reservoir. This also causes a void in the upper part of the cooling system , leaving no coolant at the thermostat and the coolant temperature sending unit. The result is a erroneous temperature Reading and will even prevent the thermostat from opening.
form_title=Replace the Coolant Fluids form_header=The fluids in the cooling system need to be replaced regularly. When was the last time you go your coolant flushed?=_ If the thermostat needs to be replaced, would you like me to install a new one?= () Yes () No Have you noticed any leaks in your radiator?= () Yes () No
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