Yesy - if the sealant got into the mechanism of the thermostat Yesy - if the sealant got into the mechanism of the thermostat Yesy - if the sealant got into the mechanism of the thermostat
Your thermostat is possibly not opening up. Replace and flush and then recheck. Good luck.
Low coolant? Cooling fan not working? Water pump not circulating coolant? Radiator plugged or restricted? Thermostat not opening? Coolong system air bound?
It sounds like you may need to replace your thermostat. Even though you have enough coolant in the radiator and overflow reservoir the coolant may not be circulating through the system because the thermostat is not opening. When the coolant can't flow through the engine and radiator it will get very hot and stay very hot. This is usually an inexpensive and fairly easy fix, just purchase a new thermostat and install it or have a mechanic do it for you.
Could be the thermostat not opening
The primary cause of a thermostat malfunction is corrosion. It prevents the thermostat from opening and closing as it normally would.
the temp gauge will run ot then cool that is when the thermostat is opening again
The thermostat is not opening up enough,
The raditator fan temperature sensor has a lower set point than what the thermostat is opening at, if this is something new then suspect thermostat is opening late.
Insufficient amount of coolant or thermostat not opening
either faulty thermostat not opening soon enuff, or wrong temperature thermostat still not opening soon enuff
According to the Gates Thermostat book, it's 92 degrees. Matt.
The top radiator hose is above the thermostat. If the top radiator hose is hot, the thermostat is opening. The thermostat is not the problem. Perhaps the radiator is clogged up or the water pump is bad. Look elsewhere.