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Check the radiator fan operation.
Try replacing the thermostat.
The thermostat controls only the temperature of the water.
I changed the water pump and head gaskets and thermostat. Still overheated. I just took the thermostat out and it's running fine. Who knows!!
No
If water is coming out around the thermostat housing, the seal or gasket is bad.
Cracked.head
That depends on the thermostat. If it's a 185 thermostat, the engine should run at 185. If it's running too hot, check the thermostat, radiator and water pump. If it's running too cold, replace the thermostat.
No heat in your car may be from your water pump going out and not feeding your heater core with enough water to produce heat. First remove your thermostat and see if your car stops over heating. If it doesnt, then you need to replace your water pump. Hopefully you havent cracked your heads. If your car doesnt over heat after removing the thermostat, but you still have no heat in the car. Then its your heater core that needs replacing. Always replace your thermostat whenever replacing the water pump.
Thermostat and radiator
First you need to run the engine until the thermostat opens, you will see the water running through the radiator. the coolant will go down into the radiator You need to continue to add coolant until you don't see anymore air coming up, or coolant go down into the radiator maybe three times that the thermostat opens. When you have got most of the air out you will see the water running inside of the radiator then stop when the thermostat closes. Cycle it two or three times to be sure.
Check the vans entire cooling system including the temp sending unit, cooling fan, thermostat an water pump. One of these is probably bad and needs replacing.