How to properly replace the thermostat on a 94 ford ranger?

we replaced the thermostat already but the truck is still running hot were not sure if the thermostat itself is faulty or if we have incorectlly installed it.How to properly replace the thermostat on a 94 ford ranger?Gernerally you can only put them in one way. You want the spring to be down into the block. If you think it may be a faulty thermostat, take it out and boil it in a pot of water in the Kitchen, you will be able to see it open and close. If the thermostat does not open, then take it back and get a new one. If it does open, then you have a problem somewhere else. Check the coolant level. Take the radiator cap off and let the car heat up so it boils out through the radiator cap. Turn the car off and then add the neccessary fluid. You may just have an air pocket in the coolant system.How to properly replace the thermostat on a 94 ford ranger?Get yourself a Haynes or Chilton manual. That will have pictures as well as words, so you can see if you are correct.How to properly replace the thermostat on a 94 ford ranger?Fords engines, coolant pipes, and water pumps are known for rusting and gumming up and turning the coolant into brown sludge. I've seen alot of Ford waterpumps rusted so bad that there was nothing left of the impeller causing no circulation, hence an overheating engine.