On our '92 the light comes on when the water level in the resovor is low. If you have the correct level of coolent possibly your sensor could be bad. Try filling the plastic resevior if it is low. There is a sensor on top of it that makes the light come on even though the temp is not hi.
The lower radiator hose goes from the bottom of the radiator to the engine block. On the engine side there will be a neck that comes off the block and the radiator hose is attached too it. Inside that neck is the thermostat and it can be replaced as a whole unit (the housing neck) or just the thermostat can be removed and replaced.
In general, engine thermostats can be found by following the LOWER radiator hose to where it attaches to the engine. The hose is typically attached to a fitting behind which is a gasket and the thermostat. The gasket needs to be replaced when the thermostat is replaced.
The hose coming from the thermostat housing connects to the upper part of the radiator and allows coolant to flow into the engine...
Ingeneral, the fan will run only if the temperature of the radiator is above the normal range. If the fan is running, then the radiator must be over temp unless the radiator fan thermostat or it's relay is defective. If the radiator truly is over temp then you have a larger over-heating problem You state the thermostat was replaced. if you replaced the fan thermostat then either the radiator really is over temp and it is doing what it should, or there is a problem with the thermostat-fan relay or switch. If you replaced the engine thermostat that controls the flow of coolent between the engine and the radiator, then that probably wasn't your problem and you should look elsewhere for an overheating cause. I would start by determining if the engine actually is overheating or not. If it is, I would look for coolent system problems like the engine thermostat (if you didn't replace it already), water pump, leaks, scale build up in the radiator, or blockages in the system. If the engine isn't overheating then I would consentrate on the fan, fan thermostat and relays.
There is a thick radiator hose coming from the right hand side of the radiator at the top, follow that hose from the radiator towards the engine. I will connect to the thermostat housing, it has two bolts.
there are two hoses coming from the radiator. the one on the bottom has the thermostat at the end near the back of the engine.
Just follow the big hose coming out of your radiator and it is right there
your thermostat is closed. needs to be replaced. inexpensive part but can save your engine from overheating.
It is located at the bottom of the engine. It's the hose coming off of the bottom of the radiator. The thermostat is located at the other end of that hose, next to the engine on the thermostat housing.
You need to check coolant temperature sensor and the water pump.
The thermostat on a 1991 Toyota 4Runner is located on the engine block. It can be found by following the large hose coming from the radiator.
The thermostat CANNOT be repaired it has to be replaced. There should be a hose coming out of the top of the radiator hose going to the engine. Where it connects to the engine should be a housing with two bolts on it. Disconnect the hose and the bolts and the thermostat is behind the housing. You might have to move something out of the way to do this, but it is usually rather easy. Hope this helps.