Sizzling from my Radiator?

A few days ago I asked a question regarding my coolant disappearing too fast and most people said that I blew a gasket. Fortunately for me, t wasn't the gasket! What happened was the clamp thing that was holding my radiator hose broke and it was being pinched not allowing any coolant to flow causing the coolant to over flow on my reservoir. Now I was just driving and everything was fine the temperature gauge seemed to be fine and when I parked and turned it off, there was a sizzling noise coming from the radiator. I let it cool then I put some coolant in and when I started driving again I watched the temperature gauge go towards the hot zone. But it was weird, because it went from being hot then it dropped back down. Could it be the same problem? Or could it be a bad hose or something? I doubt it's a gasket. It made the sizzling noise again when I parked and stopped after a few minutes. I drive a 2001 Ford Escape XLT V6 2WD and it has 206,963 miles on it. It's on It's last life, I know. It also has an oil leak that the mechanic wants 1500 to fix it.

Does it stay normal after 'being hot then it dropped back down'? If so and your only concern is that it gets above normal hot for a little while. Changing thermostat may fix that problem.

When the temperature rises and then drops down on the gauge, that is often the indication that the thermostat in the radiator has opened, allowing coolant to flow through the radiator. Perhaps the thermostat is not operating properly sometimes because what you may be hearing is water boiling in the radiator. Perhaps replacing the thermostat will help. If there's a high temperature one installed a lower temperature one will open sooner and allow the coolant to flow sooner and more often. Your vehicle will not warm up as quickly when it has sat overnight, and the heater won't be as warm, but in the summer months this is not an issue. Cost? $5 to $10 for the part. Ask your mechanic if you think it would help. As I might have mentioned last time, the radiator could be partially plugged up. With that many miles and few if any coolant system flushes, I'd bet on it.

I highly recommend that you get a book on basic mechanical systems and maintenance of a car.

The coolant isn't reaching where it's supposed to which is causing your car to overheat. Because that's what the coolant is made for. Make sure the clamp isn't too tight you might want to get that checked again. Because if your car fluctuates between temperatures then it could mess up your engine by being too hot or too cold. If your engine overheats too bad then it could cause multiple problems like your car won't turn on you could end up needing a new belt because overheating can blow your radiator and that's maybe between 500-700$ to get fixed and call different places and see where you can get an oil leak fixed for cheaper half the time you could spend less than half just to get something fixed I paid 117$ just for a tune up so you shouldn't have to pay almost 2 Gs just for a fix