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Running hot think it is air locked how do you bleed air from it

Replaced thermostat and radiator still running hot and blowing cold air out of heater the lower hose is cold and the heater hoses are also cold the upper radiator hose is hot

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Loosen the cap on the rad and run the engine up to operating temperature. Make sure the rad is full, and go for a short drive around the block to warm up the engine. Make sure the heater is turned on high and the fan running full. There will likely be some burping and gurgling going on as the air gets forced out. Keep checking and topping up the rad. Eventually it will stop.You should run it for acouple days with the cap loose to be sure all the air is out. After that, make sure the rad is full, close the cap and top up the overflow bucket.

Posted on Nov 23, 2013

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Posted on Jan 08, 2009

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SOURCE: Buick allure 2005 heater blow warm air, have to

The heater radiator had to be flushed twice at the dealership. No problem since then.

Posted on Jan 19, 2010

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SOURCE: replaced water pump engine overheats

You still have air in the system. remove the radiator cap, if you have one, if not remove the resevoir cap. start the car and let it warm up to operating temperture. keep check on the level and fill as necessary. you may have to do ths a couple of times.

Posted on Nov 14, 2010

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SOURCE: 1992 Toyota 4Runner, overheats, radiator,upper

Thanks for choosing FixYa and welcome to the site. Have you checked to see if it is a coolant sensor? Have you checked to make sure the fans are coming on? Are you leaking coolant anywhere? Checked the cap?

Posted on Apr 10, 2011

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SOURCE: temp gauge over heating no heat through vents cold

You will need to bleed the air out of the system there should be a bleeder where the top hose connects to the engine

Posted on Dec 06, 2011

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Over heating and blowing cold air from heater

Possibly leaking head gasket. Easiest way to check would be to fill radiator full, start engine and watch coolant level in the radiator cap opening. The top radiator hose will become hot when thermostat begins to allow coolant flow through the radiator. You may have to top off the coolant. Still with the radiator cap off watch for water belching out of the radiator neck. If coolant does belch out of the radiator cap neck, refill with water. If it belches out coolant again it would be combustion gassed forcing the coolant out of the radiator.

This process should take about 1/2 hour to diagnose if it is a head gasket leaking combustion gasses into the coolant.

The radiator fan may run once car is shut off to cool engine compartment to prevent gasoline in fuel lines from vaporizing which would cause a condition called "vapor lock". A car won't start if fuel lines are vapor locked.

Good luck, I hope this helps you to figure out the problem.

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I recently replaced my thermostat on my 2001 maxima and the heater still blows cold air and the temp gage rises as if the car is overheating. Is it ok to drive the car till I can fix the problem?

when the gauges are telling you that a problem exists like over heating. Cold air may mean an air lock in the cooling system. So I consider it to be foolish to risk a motor without checking the temp gauge for correct operation for starters . After running for 10 minutes feel the top radiator hose and if it is not hot to the touch but the gauge shows hot then you have a cooling system problem that would be checked by a radiator shop.. It may just need pressure bleeding to get the air out of the system

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I have a 2002 Chevy tracker. It's been running hot on the temp gage. So, I have changed the thermostat and replaced the radiator hose because of corrosion but it still overheats and when I turn on

If there is cold air coming out the heater than there is air in the system. After you replaced the thermostat did you run the engine at idle with the radiator cap off until the engine came up to operating temp? Doing this will purge the air from the system.

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Drained radiator added prestone Radiator flush refilled and started overheating, drained radiator replaced thermostat and now I get no heat from heater,Radiator water is hot

disconnect the heat hoses going into fire wall , put hose into one with pressure and flush as it sounds like it could be bloked in the heater core,the other thing that could be the problem be the hot ,cold switch as it restricts the flow to makes the heater hoter or colder , it might need tlc or replacing as it is manaul not elec

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I've had my 2004 Nissan Sentra to several mechanics. It's still there. No one can figure out why I'm only getting cold air, no heat. (for weeks now). I paid for new thermostat, water hose, radiator. ...

Assuming they checked the controls under the dash and everything is working, lets try to bleed the air from the cooling system. An air lock in the heater core could stop it from getting warm. You will need a gallon of antifreeze and a jack to raise the car. Here we go: remove the radiator cap. Set the parking brake, transmission in park, block the rear wheels. Jack up the front of the car so that the radiator is higher than the engine. Start the engine and put the heater controls on the hottest setting but don not turn the heater on. With the engine running, look in the radiator, the coolant at this point should not be moving, or flowing through the radiator because the thermostat has not reached the temperature required for it to open. If the coolant is flowing at this time, then the thermostat is open and should be replaced. Let the engine warm up and watch the coolant level. When the thermostat opens up, the coolant level will drop, and you will be able to see the coolant flowing or moving in the radiator. Add enough antifreeze to fill the radiator ack up. The coolant level will probably drop again, Add more coolant as required. Repeat this process until the coolant level stabilizes and no longer drops while there is flow or movement of the coolant. Replace the radiator cap and lower the jack. Turn the heater on. If the problem was an air lock in the heater core, you should now have warm air blowing from the heater.. Something else to observe is the cooling fan for the radiator. If the electric cooling fan was running the whole time the engine was running, then the switch controlling the fan is bad. The fan should not come on until the radiator is hot. If it runs all the time, the coolant won't get hot enough for the heater to work. Let me know is this works.

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Teperature gauge running hot and heater not working

If the car is hot and the heater blows cold air your thermostat is stuck shut or your radiator is really low on water/antifreeze check when engine is cold hasn't been ran like overnight take off the radiator cap and if it is low add so antifreeze/water if heater still blows cold air or water level is ok your thermostat is stuck shut and needs to be replaced.

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flushing the radiator might not be enough to remove the water scales inside the small cavities...have it opened and cleaned thoroughly. In the location where I live they remove the top and the bottom part of the radiator and put a flat wire in and out into each of the flat tubes to dislodge the accumulated scales and dirt out. hope this helps

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