No heat,blower blows only cold?

Very common issue,noticed by many car models.

The heat is generated by a radiator located in your dash using engine coolant. You don't have heat because the valve that is controlling the coolant flow is closed - either it or the commands that is controlling it are broken - Inspect both of them to confirm.

For more help,i will say.......

The valve is located on the tube that brings the coolant from the engine - depending on your engine model it's located very close to the firewall (the big piece of steel that separates from the engine) either in the engine bay or behind the protection grill.
The commands elements - when you turn the heat button on the dash, it is pulling on a cable which is pulling on a lever attached to the shaft of the valve. So most likely part that has failed here is the button (made from plastic) , followed by the lever and finally the cable (corrosion) .

This is how its routed and it works.

This details will help.

Thanks.

See below more help solutions :----

Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
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Heat blows cold on drivers side and hot on passenger side?
http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html
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Hot air on the driver’s side vents only?
http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html
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Car heater blowing warm, but not hot air?
http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html

Heater quits heating after few minutes on Ford?

On this case, i suggest you to check this direct help links.

The problems like heater not blowing hot,ho heat,car blows hot and quits,heater blows cold,etc.

are very much noticed on vehicles.In this case

See the help links below :----

Car quits heat after few minutes?

http://technoanswers.blogspot.in/2012/02/chevy-equinox-quits-heat-after-few.html

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Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Heater stuck on defrost?

http://howtobyme.blogspot.com/2011/12/heater-stuck-on-defrost.html

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Car heater blowing warm, but not hot air?

http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html

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Heater problem?

http://technoanswers.blogspot.in/2012/02/heater-problem-on-isuzu-trooper.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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Hot air on the driver’s side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

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Ford  Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

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A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

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Ford  AC blows cold through defrost vents instead on cabin vents?

http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

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AC air blows through defrost vent only on Ford ?

http://technoanswers.blogspot.com/2012/01/ac-air-blows-through-defrost-vent-only.html

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Ford Air flow selector not working and Air blows from defrost vent only?

http://technoanswers.blogspot.com/2012/01/ford-escape-air-flow-selector-not.html

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AC blows air out of defroster and floor vents only on ford ?

http://technoanswers.blogspot.in/2012/01/ac-blows-air-out-of-defroster-and-floor.html

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This details will help.

Thanks.

Car heater not working?

Car heater not working this problem is faced by many other users too.
Its quite possible that thermostat is faulty or heater core is plugged or radiator is clogged,or heater hoses are worn out or clogged,or the coolant is low or leaking.
There are many possibilities that can cause this problems.
You need to troubleshoot the problem.

First you try is confirm that heater core is not clogged.To confirm this
First warm up the car and turn on the heat.Then touch the 2 hoses going through the firewall to the heater core.
If one is hot and the other is not.You have a clogged heater core.

Next you check is radiator,if its clogged with rust/curd /dirt layer collected in it then you will notice this no heat or low heat problems.Get the radiator inspected and flushed.

On some model vehicles there is a valve that opens and close,this controls heat.This valve is called heat control valve.
This valve is located under the hood.It opens and closes the valve which gives you heat.

This is how the system works ,when you switch the control knob which is located inside the vehicle.There is the  switch that gives you the hot or the cold. 

Try this ,slide the lever that controls the defroster,you should hear a hissing sound which opens and closes the flap inside the dash.If it is not working this can also cause no heat.

Another possibility that can cause no heat is vacuum leak.The vacuum hose are loose or cracked OR the vacuum line is cracked.To confirm this get under hood and look for a broken vacuum line which is connected to a round ball .The ball is mostly  black in color and has plastic lines connected to it.Now follow this lines and make sure that none of this lines are broken.If  you notice any of the line is broken in between then go to auto parts store and find a rubber hose which will slide over the broken lines.Also be careful and when repairing They get really fragile.This lines are not very strong,so slide the hose bit slowly and carefully.
Check the vacuum tube to it if its not broken replace the valve. If the valve is leaking, coolant will be all over the transmission, its orange in color,on some car models.

In some cases trouble with the doors in the heater duct not opening properly. You might want to check the vacuum supply to the heater control switch in the dash.

If there is no vacuum leak,then check for coolant level,if its low then additional coolant needs to be added.

This basic testing details will help,you to confirm the problem for no heat on your car.

For car AC related and Heater related solutions. You can refer the options mentioned below:---

Car AC Blows Warm Air ?

http://technoanswers.blogspot.com/2011/10/car-ac-blows-warm-air.html

How to test AUTO AC pressure?

http://howtobyme.blogspot.com/2011/10/how-to-test-auto-ac-pressure.html

AUTO Air Conditioning Troubleshooting?

http://technoanswers.blogspot.com/2011/10/auto-air-conditioning-troubleshooting.html

AUTO A/C COOLING PROBLEM?

http://technoanswers.blogspot.com/2011/10/auto-ac-cooling-problem.html

Fixing refrigerant leak?

http://howtobyme.blogspot.com/2011/10/how-to-fix-refrigerant-leak.html

How to locate Car AC Refrigerant leak?

http://technoanswers.blogspot.com/2011/10/how-to-locate-car-ac-refrigerant-leak.html

CAR AC INTERMITTENT COOLING?

http://technoanswers.blogspot.com/2011/10/car-ac-intermittent-cooling.html

What causes INTERMITTENT COOLING on Car AC system?

http://technoanswers.blogspot.com/2011/10/what-causes-intermittent-cooling-on-car.html

Car AC making Noise?

http://technoanswers.blogspot.com/2011/10/car-ac-making-noise.html

BAD ODOR ON CAR AIR CONDITIONER?

http://technoanswers.blogspot.com/2011/10/bad-odor-on-car-air-conditioner.html

How to Recharge Car's Air Conditioner

http://repairhelpcenter.blogspot.com/2011/10/how-to-recharge-cars-air-conditioner.html

heater blows only cold air?

Check the heater core. There are two hose coming out of the fire wall that go to the heater core when car is hot check both hoses for flowing water. If you have flow both hoses will be hot if not 1 will be hot the other will be cold. ( clogged heater core ) the other and last thing to do would be to check the blend door motor witch is a big problem for gm cars. This motor sits on the door that will move air flow to the heater core or for the a/c (cold air ) this motor can be stuck or broken.That needs to be checked.

If the motor is not operating,then it has to be replaced.
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For more heater troubleshooting problems:---

Click the link below:---

heater not working on Lexus RX 300?


2000 kia sportage heater blows cold air?


No Hot Air from Heater and Defroster on Kia Optima...


Heater blows cold on dodge dakota?


Heater blower motor works only on high mode on Che...

Car AC Blows Warm Air ?

http://technoanswers.blogspot.com/2011/10/car-ac-blows-warm-air.html

How to test AUTO AC pressure?

http://howtobyme.blogspot.com/2011/10/how-to-test-auto-ac-pressure.html

AUTO Air Conditioning Troubleshooting?

http://technoanswers.blogspot.com/2011/10/auto-air-conditioning-troubleshooting.html

AUTO A/C COOLING PROBLEM?

http://technoanswers.blogspot.com/2011/10/auto-ac-cooling-problem.html

Fixing refrigerant leak?

http://howtobyme.blogspot.com/2011/10/how-to-fix-refrigerant-leak.html

How to locate Car AC Refrigerant leak?

http://technoanswers.blogspot.com/2011/10/how-to-locate-car-ac-refrigerant-leak.html

CAR AC INTERMITTENT COOLING?

http://technoanswers.blogspot.com/2011/10/car-ac-intermittent-cooling.html

What causes INTERMITTENT COOLING on Car AC system?

http://technoanswers.blogspot.com/2011/10/what-causes-intermittent-cooling-on-car.html

Car AC making Noise?

http://technoanswers.blogspot.com/2011/10/car-ac-making-noise.html

BAD ODOR ON CAR AIR CONDITIONER?

http://technoanswers.blogspot.com/2011/10/bad-odor-on-car-air-conditioner.html

How to Recharge Car's Air Conditioner

http://repairhelpcenter.blogspot.com/2011/10/how-to-recharge-cars-air-conditioner.html

NO heat on car?

Get the blower motor checked,if the blower motor is not running then get the motor checked by meter if the motor is checked ok then it can be faulty blower motor resistor.Replace the faulty.

There are a few reasons this might happen to your system. A typical system is shown in the diagram below:




The system requires hot water from the engine to pass through the heater core and the blend (or mix) door positioned for air pushed by the blower motor to pass through the core. If the vehicle has no air conditioning, the evaporator is absent from the system. Some designs also incorporate a control valve in the heater hose to stop coolant flow to the heater core when not in use. The blend door position is actuated by a stepper motor or cable.
Typical failure modes are as follows:
1. Blend door stuck
2. Blend door actuator failed motor or stripped gears
3. Blend door cable is broke or needs adjustment
4. Temperature control switch failed
5. Air pockets in engine cooling system
6. Clogged heater core
7. Heater coolant control valve failed closed
8. Thermostat failed open

Troubleshooting:
First, with your engine hot and the heater turned on, feel the heater hoses in the engine compartment as they attach to the heater core at the firewall. If either of the hoses is cold, the problem is likely a lack of adequate coolant flow.

No or low coolant flow:
Check for the presence of a control valve in one of the heater hoses--trace the hoses all the way to the engine. Not all vehicles have such valves. If you find one, check to see if it is actuating properly. It should receive a signal of some kind from the heater controls and open when the temperature control is turned to heat. If you cannot determine that the valve is opening, try taking one of the clamps off and removing the hose to see inside the valve. A typical vacuum operated heater flow control valve is shown below:



The valve may also be actuated by a solenoid or wire cable.
If you have no valve, next check the cooling system for air. If you have a radiator cap, take it off and look inside. If it is not full, fill it with coolant and start the engine. Turn the heater on and let the engine run until it is warm and the thermostat has opened. Continue to fill the radiator or reservoir until the level stops falling. Check for the presence of any bleed ports in the system. Bleed ports may be on the housings that radiator or heater hoses attach to or may be installed in the hoses themselves. A typical Honda application is shown below:



For stubborn cases, park the car uphill, take cap off radiator, start car, fill radiator, let it warm up until thermostat opens, bleed air out, fill to the neck of the radiator and watch for bubbles coming up. Once you have bled the air, if gas continues to come out, you may have a blown head gasket that is forming bubbles that can block coolant from entering the heater. In these cases, the heater may work well at speed but blow cold at idle.

Clogged core: If the control valve is open and there is no air in the system, your heater core may be clogged. A quick way to check for a clogged core is to turn the blower motor off for a while and then back on. If it produces warm air for only a short time and then cools down, your core is only passing a small amount of coolant. This can also be caused by a bad control valve, if you car has one or possibly by a weak water pump. You can try flushing the core by removing the heater hoses and attaching a garden hose or other source of water pressure to force water through the core. Use an adapter to make a good seal and connect to the lower pipe to backflush the core. If the core will not flush or allow adequate flow, replace the heater core.

Thermostat: if your car temperature is running cold and only warms up when idling, the heater will do the same. This is caused by a thermostat that has failed open, allowing too much coolant to flow through the radiator.

Blend door not moving to heat position:
If you have coolant flow through the heater core, the problem is with the blend door. The blend door is almost always actuated from under the dashboard. Many systems use an electric motor to actuate the blend door. Check any heater or A/C fuses before tearing into your system. You may need to remove a partition to see the actuator. The door should be to the right of center under the dash. A typical electric motor actuator design is shown below.



The actuator can be on the top front or bottom of the duct. Consult a manual for your vehicle if you cannot locate the actuator. Once you can see the actuator, watch it while you change the temperature setting (key on unless it is cable operated). If the actuator doesn't move or turn, troubleshoot the reason.Systems such as the one in the above picture typically fail in the shaft attach or the internal gears on the actuator. If your actuator is getting power but not moving the door, replace the actuator. If the actuator is not getting power, troubleshoot the control switch. Due to the wide variety of designs, we cannot provide test tips for electric blend door control switches.
Whether your blend door is electric or cable operated, remove the actuator and operate the door with your hand. If the door sticks, the heater box must be removed and opened to free the door and restore unhindered operation.
If your blend door is cable operated, check the cable for proper attachment at the control lever and at the door lever. The cable sheath must be properly adjusted and firmly clamped for proper operation. To adjust, first remove the cable from the door and move the door lever with your hand to observe the range of motion. Then set the control to full hot, open the door fully, and reattach the cable, clamping the sheath so as to ensure the door opens fully when set to hot.

To Order car parts online:--To get heavy discount on car parts .Click this link below:----

http://technoanswers.blogspot.com/2011/05/from-where-to-order-car-parts-online.html

For car error code diagnosis click the link below:---

http://www.automd.com/diagnose/?amdcid=apwldrbrd1

Car no start:--

http://technoanswers.blogspot.com/2011/05/car-will-turn-over-but-will-not-start.html