Temperature go up and down?

Car is a 95 Buick Century, 6 cylinder. Just had the radiator replaced about 8 months ago, and the heating system core and thermostat were also replaced within the finishing two months. The heater blows cold air while the temp evaluate is nearly overheating, then warmer nouns once it goes back down to the middle. It merely stays in the hot zone for a few seconds and consequently goes back down. Car have 104,000 miles on it. Any advice as to what the problem possibly is? Thanks for your help!
ADD ON...newly checked my levels and under the radiator trilby I didn't see any coolant, and it should definitely be topped off from a moment ago getting the new thermostat put in a couple days vertebrae. The reservoir had plenty of coolant left. Is it possible the coolant is one put in the wrong spot by the radiator? I know nothing more or less cars, help me out!!

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Perhaps you need a strange water pump, heatr control valve, and a heat sending unit.105km is a lot of mileage for these parts. Good luck!!
Check the coolant even first it sounds like it is low. This is most likely the lead to because you have no heat out of the oven. This is caused by air pockets within the system. Also check for leaks on Buicks there is an nouns bleeder on the coolant system when filling it with coolant to know how to get all of the atmosphere out or else you will have problems close to this if they didn't do this this is where you problem is

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naw dude try this, inflict it was happening to me within my car. try the radiator cap, whats up is water expands when it is heated, and the cap cannot hold the pressure surrounded by and its dumping it in the resevor. if its not that then u obligation a mechanic cause u have a outflow just keep lying on the fluid level and ull be fine

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if you just have those items changed then you probably picked up an air bubble.they should own done this at the shop where the work was done.but lately because they have a wrench doesnt make them a technician,start the sports car with rad cap past its sell-by date,top off the antifreeze,turn heater and lover on high,let run till it reach the operating temp,squeeze the upper hose a couple of times then let sit running till you hear the radiator fan kick on,replace the rad cap you should be right to go.

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Check the coolant even first it sounds like it is low. This is most likely the lead to because you have no heat out of the oven. This is caused by air pockets within the system. Also check for leaks on Buicks there is an nouns bleeder on the coolant system when filling it with coolant to know how to get all of the atmosphere out or else you will have problems close to this if they didn't do this this is where you problem is

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Answers:    It may be very low on coolant so yes, top it past its sell-by date. Also, you could have a faulty thermostat (it happen man). First do the coolant then if that doesn;t work, have the thermostat changed again.
naw dude try this, inflict it was happening to me within my car. try the radiator cap, whats up is water expands when it is heated, and the cap cannot hold the pressure surrounded by and its dumping it in the resevor. if its not that then u obligation a mechanic cause u have a outflow just keep lying on the fluid level and ull be fine

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