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possibly air trapped on engine side of thermostat-possibly. HOW TO BLEED: loosen coolant temp sensor. Start engine. As engine warms, slightly unscrew sensor to allow air to escape. Once a steady stream of coolant trickles out you're good. Let us know if this helps. Good luck.
could be a number of things, 1. water pump not working 2. Thermostat stuck (replace if its boiled) 3. air lock in system. 4. Head gasket. 5. cracked head/block. I presume you have checked that you belt is not broken, are there any signs of leaking around the waterpump? if there are, change the pump, If the engine has overheated, change the thermostat. these are the most common things, other than these 2 it is going to take further examination for cylinder head problems or blocked water ways. Go for the thermostat first, its probably the cheapest part to replace, and see if that cures your problem.
I"m not sure what the problem is, this sounds like the engine light is coming on because its overheating and you replaced the airpump and alternator and now you thinks it is the thermostat. if this is correct then yes replace the thermostat and also check the fan clutch, when engine is hot the fan should not spin freely. and last are you sure the engine light is on due to it overheating, if it is due to overheating then check fan clutch and replace the thermostant
Very possible you have a blown head gasket. A compression test on your engine will verify that. When you changed thermostats, was your coolant clean, no traces of oil contamination? Have you checked your oil dipstick? A milky color would indicate water (coolant) in your oil, a sure sign of head gasket failure. Just depends how badly it overheated. But if it wont start, I'd say get a compression test.
Do you think that it's overheating because the temperature light is on? If so, then it's possible that you have a bad temperature sensor and not an overheating engine. Look for other signs of engine overheating : 1.Sluggish engine operation. 2. Detonation upon acceleration (pinging). 3. Rough, uneven engine idle. 4. Coolant boiling in overflow tank. If your vehicle is experiencing these symptoms, then overheating is indicated. One of the most common cases of overheating is a bad thermostat. Another common problem is a faulty cooling fan or fan circuit. The cooling fan can be checked by running the engine at operating temperature and turning on the AC control. if the fan does not come on, then a problem with the fan circuit is indicated. The thermostat can be checked by placing a cooking thermometer on the motor near the upper radiator hose where it attaches to the motor. the temperature should not go above 225deg. If it does, then replace the thermostat. If the temperature stays at or below this rating, then replace the temperature sensor. I hope that this information helps you with your problem and thank you for using Fixya.com.
WARNING : Be very careful when working around cooling systems when the engine is at operating temperature. DO NOT open the radiator cap (if equipped) or even the overflow tank cap when the system is hot. Always wear safety glasses. Remember that electric cooling fans can operate at any time, even after the engine is off. Keep hands away from fan when working in the engine compartment.
One note- many thermostat elements can be installed backwards and while they will function, they don't allow full flow of the coolant like that.
Dunno what the bolt might be for-
Another possibility is a blown head gasket; if these fail between any combustion chamber and a coolant path, it will heat the devil out of coolant and generally cause exhaust fumes in bubbles in the cooling system.
You can check for signs of rust on your plugs since the cooling engine will **** in coolant and that will leave deposits.
Also check your coolant for any signs of a milkiness and your oil for signs it is turning into hand-lotion.
If you are going to the expense of replacing the head gasket, it would be false economy not to also replace the thermostat at the same time.
Particularly if you are attempting to solve a overheating problem.