06 jeep w/aircondition blows hot air out only.checked radiatior
Plenty of fluid in radiator and overflow tank, blower seems to work only hot air comes out. looked at fusebox inside the engine compartment they appear to be ok. is there another fusebox inside the jeep under dashboard ? I havnt located it? and or how do u check the sensors and resistors or relays in engine compartment fusebox?
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Here is the principle.
Water and coolant/antifreeze will expand when heated, as will the air trapped in the radiator and system.
If you cap off the overflow, the liquid will have no place to go, and will either go past the radiator cap or will blow up the radiator or a hose.
If the liquid exits at the radiator cap, when the engine cools down, the system will be low on fluid, and will create a vacuum.
If you had a working coolant tank, the vacuum would draw the coolant back into the radiator by suction.
If you cap the overflow off, you will leave the radiator low on coolant. At that rate, when it gets hot the next time, it can overheat, and if worse comes to worse, you can blow a head gasket.
God bless your efforts.
Is the liquid clear or colored? If it is clear and you have been using the air conditioner, it is just condensation and not a problem. If the fluid is colored yellow/green or orange and feels slippery, it is coolant. This means you may have a loose hose fitting, a leaky hose, a bad radiator cap or a bad water pump. You'll need to look under and over the engine to see where the fluid is coming from. If you added fluid recently, you may have added too much and it may be coming from the overflow tank. That tank could have a leak or a loose hose going/coming from it.
Good luck. Make sure you have plenty of antifreeze in the radiator and overflow tank at all times so you don't overheat the car. Check the levels while the car is cold.
To start, the first thing I would check is the fluid level in your cooling system. Do not remove the radiator cap if the engine is hot! The water will shoot out like a geyser and you could get burned or scalded by steaming hot water. Best to check it when the engine is cool. If you need to add fluid it should minimally be a mixture of 50% water and 50% antifreeze. This way the fluid won't freeze in the winter or overheat in the summer.
Check the hose that runs from the radiator cap to the overflow container. Make sure it doesn't have any holes in it and it is not plugged up. Make sure the overflow tank has fluid in it to the level indicated on the tank.
These are basic, simple things to check. If these don't remedy the problem other possibilities are a bad thermostat, water pump, radiator cap, or a plugged heater core.
CHECK COOLANT LEVEL STILL LOW.ADD MORE COOLANT.UNTIL RADIATOR OVERFLOW FULL AT COLD MARK.THEN CRANK ENGINE UP LET IDLE FEW MINUTES LOOK DOWN COOLANT OVER FLOW JUG ADD MORE COOLANT IF LEVEL DROPPED.WHILE ENGINE RUNNING KEEP EYE ON TEMPERATURE GAUGE.WHEN THERMOSTAT HOSE GET HOT.TURN OFF ENGINE WAIT A LITTLE WHILE TO KEEP FROM GETTING SCALD TAKE LARGE RAG PLACE OVER OVERFLOW JUG RADIATOR CAP.OPEN CAP A LITTLE A TIME.IF COOLANT TRIES BOIL OUT.LET VECHICLE SET A WHILE LONGER.ADD MORE COOLANT.WHEN COOLANT LEVEL CORRECT AND ALL AIR OUT THE COOLANT SYSTEM.IT WILL STOP OVERHEATING.LONG AS ENGINE RUNNING HOT TURN OFF THE ENGINE POUR IN MORE COOLANT UNTIL COOLANT LEVEL STOP DROPPING IN RADIATOR.KEEP COOLANT LEVEL IN OVERFLOW AT COLD MARK.DONT OVER FILL OVERFLOW JUG.
It sound like there may be a small leak in the cooling system. You can check this by pressurizing the cooling system. You can buy a pressure checker for about 100 dollars. It will usually show up leaks that are small because you can pressurize the system cold and it won't evaporate.
It sounds to me like you're low on coolant. When you checked the coolant level, did you actually open the radiator cap and make sure the radiator is full? The plastic tank you generally add coolant too is actually an 'overflow' or 'reserve' tank. There is a hose that runs from that tank to the top of the radiator so if the radiator gets low on coolant, more coolant -should- run in from the overflow tank. However in practice this does not always work. I have a Jeep that leaks
coolant and experiences this exact same problem. Coolant will not run from the reserve tank into the radiator because the hose is plugged up, and whenever the radiator gets low on coolant the temp gauge will go real high and
then drop, and the heater doesn't work well. This is because the
cooling system of your car is supposed to be a closed system, full of
coolant and no air. When coolant leaks out, the space it used to occupy
is now occupied by air, which does not transfer heat well. When 'air'
is passing through your cooling system, no heat can be transferred from
your engine to the heater and radiator, resulting in a hot engine and
no heat at the heater. Then when a pocket of water passes through the
system, the temperature gauge quickly falls as the water absorbs the
heat from the engine. The hot water that cools the engine is where the
heater gets it's heat from as well, so when water passes through the
heater core, the heater works, but when it's filled with air, it
does the blower still work?? Are you waiting long enough for the engine to warm up?? your heat comes from the engine heat. hot coolant (antifreeze) flows through the heater core (like a smaller radiator) behind the dashboard. the blower pulls air through the hot heater core, making the air hot.
If it blows air, but never gets warm, you should first check your coolant. if you drive your car without it, you will have big, expensive engine problems. If there is no coolant or very low coolant, you need to check for leaks after you refill it. (make sure you get the right kind of antifreeze. autozone can help)
most cars that new dont have radiator caps. Instead there is a seperate coolant tank under the hood. fill it to the full mark, let the car run and watch it. It will **** down the coolant from that tank untill the radiator is full.
If you have plenty of coolant, you may need a new thermostat. sometimes they get stuck. some stick open, some stick shut. It is usually easy to change one and they are cheap. I can't help you much with that cuz its different on every car. on my car, I have to crawl under it to get to the thermostat. hope this helps.
almost sounds like air in the system.... let it warm up so the thermostat is open... squeeze the hose going to the heater core. make sure the radiator is filled as well. if it has an overflow tank add fluid to that.