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The most common issues with the cooling system can be broken down into 3 categories. (Fluid Type) (Fluid Purity) (Stuck Thermostat)
If your vehicle is cooled with *Dexcool* then your system will need to be flushed regularly. About every 7k-10k miles or so. The reason being, Dexcool congeals (gels) as it gets older, and will clog the entire system from radiator, to the heater core, stopping the flow of coolant.
If you are replacing your coolant with tap water, it will not have the cooling capacity of a proper 50/50 mix.
Coolant will not circulate if your thermostat is frozen shut. There are ways to test it, but in most cases, it is easier, and sometimes cheaper, to just replace it.
Now, to answer your original question, take the top radiator hose off at the radiator, then loosen the butterfly bolt located at the bottom of the radiator. Not all radiators are equipped with the bleeder, so simply take off both the top, and the bottom hoses. This will drain all coolant from the radiator. To do a "fluid flush" is a bit more difficult. Remove all hoses going to the radiator, remove the thermostat, and at the thermostat connection to the engine, purge the system using a garden hose tapped from your home. A shop will do the purge with 50/50 mix to flush the system and catch the old fluid as it comes out, but not needed if you do it at home. Flush the radiator the some way, using the top at the hose connection point. Just run the water through until it comes out clean. Reattach all hoses and thermostat. Go to your local parts store and buy a 50/50 premix that is appropriate for your region.(cooler for warm weather, warmer for cold) and do not add water. They come mixed ready to put in the vehicle. Make sure you fill it up where you are supposed to. If you have the old style radiator, the cap is located directly on the radiator. If you have a reservoir, fill it up to the line. *****Make sure you you start the vehicle to operating temperature to fill the reservoir to the appropriate level.***** I hope this helps. Good luck!
First check and see if the fluid in the radiator is up where it should be. When was the last time the thermostat was changed? Could be no good.These things cause just warm air If the blower is working as it should you will have air flow but it your antifreeze is not warming up like it should it will be cool. .
While it doesn't seem likely, if you've changed, or had the thermostat changed.... I'd say you got a faulty thermostat. I am curious as to what your temperature gauge says the temperature of the engine and coolant is.. If your gauge is showing hot, I can think of two more possibilities... the water pump isn't pumping right... and, if the water pump isn't working right, the problem can be a cracked head or block, which can cause an airlock in the coolant system. Check the coolant or radiator cap.
remove cooling flute and thermostat fit1/3 off radiator cleaner with fresh water top up 1/3 more in and 1/3 two days later drive for 1 week and flush your system fit new thermostat new radiator cup and antifreeze .notes radiator blockage after removing the thermostat is,when engine is hot top hose expand and is hotter then the bottom hose notes when the fans engage.
Thermostat.? if you haven't? Do it first then try it. While the car is running for a while touch the heater hoses that lead to the firewall. if one is cold and one is hot? You have a blocked Heater core. Follow the hoses back to the engine. Unconnect them both. By using a garden hose flush out the heater core do one side and then reverse by doing the other hose Lots of junk will come out so be care ful. Mistake people make is "Flushing the system" That doesn't mean your flushing the heater core. Seeing that you have done everything else it could be the thermostat which you didn't list or the heater core being clogged. When you finished installing the thermostat and flushing the heater core out. Replenish the coolant system . If you have a bleeder on the thermostat housing? use it . loosen it and top off the fluid until you see fluid comeout of the bleeder. The system being air bound would cause no heat..
Heres a couple of things you can check. Start your car and remove the radiator cap,(before it gets hot mind you) when it reaches norm operating temp, look inside radiator to see if water is circulating. If its not moving, its a bad water pump. Also, youre hoses should never collapse, if they collapse when they get hot maybe you need new hoses? Finally, if those dont work, flush out your radiator. Open the bottom cockpit and use a garden hose and let it flush out the system while the car is running, about 10 mins should do the trick. If the radiator looks clean inside then it doesnt need flushed.
Open the petcock on the bottom of the radiator and allow the old coolant to drain.
Close the petcock.
To refill you will first fill the degas container to the cold fill range, leave the cap off the canister. Turn all of the heater controls to warm and turn fan to full. Idle the engine until the thermostat opens. Top off the coolant and put the cap back on. Idle at 3000 RPM for several seconds and then idle again for a minute or so. Check the level and then repeat this 4 times, or until heat is coming from the front and rear heat units.
If you want to flush the system you will have to remove the thermostat and hook up your flush system to the radiator hose at the thermostat housing. Follow the instructions on your flush system then put the thermostat back in. Follow the instructions above to refill.
Build up in the coolant system a faulty Sensor reporting that the engine is hot when it is not. You can try running a coolant flush through the system to remove that possible problem. If you are basing this overheating problem on coolant being forced out the over flow, do a compression check on the cylinders. If one or more of the cylinders is running extremely high compression you may have a faulty head gasket, cracked head or cracked block.
a couple of things....change out the thermostat,and check to see if you have water dripping from your water pump.if you do then change out your water pump.and check if both top and bottom hoses are getting hot if they are then that means water is circulating through your engine which is a good thing.