Only cold air come out of heater

We dont know what esle it could be we replaced the heatercore and thermostat we have burped lines and calbrated the heating dont know what esle to do we dont have the money to take it in the shop
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Hello, and thank you for writing in. The vehicle is likely having issues with the water pump. If you have replaced the thermostat and the heater core, you likely have a clear path for the warm coolant to flow through the system. It is likely that at this point you would have noticed an issue with the coolant level if there was a leak. So, the only component left that would restrain the flow of coolant through the engine and into the heater core would be the water pump. This is the main component in which pumps all of the coolant through the system. The other option is that the radiator is clogged and not allowing coolant to flow freely. With the repairs you have already made, you should have little issue replacing the water pump as well. If this does not fix the issue, you are looking at an electrical issue. For more help resolving the issue, contact our service department to schedule an appointment.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

If there isn`t enough coolant in your system, the heater core will blow cold air into your car. Solution: If you confirm that a low coolant level is the source of your problem, you simply need to top off your coolant. You may want to check for leaks as well if you just recently refilled your coolant.
If your furnace is blowing cold air in your home, this is a sign of an issue with the flame detector, gas supply, air filter, pilot light, or condensate lines. Many of these issues are able to be easily solved on your own by sanitizing or replacing components in the gas furnace.
The most common reasons a Dodge Caravan heater isn`t working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor. Search our network of RepairPal Certified shops near you to speak with a technician about your issue.
You can find three buttons on the left in the Dodge Caravan conditioning controls. Press and hold the topmost and the bottom buttons. While the top AC button regulates the rear wiper, the bottom one regulates the washer fluid of the rear wiper. Now check the AC light; it should illuminate and flash.
Your Filter`s Dirty

Your furnace needs a clean and clear air filter to circulate hot air efficiently. Over time, debris, dust, and allergens build up on these filters, which eventually causes them to clog. So if your furnace is blowing cold air, you`ll want to check your air filter.

If you find that your car heater system is blowing air but that your car is not heating up: There could be a blockage or other problem stopping heated antifreeze from moving through the heater core component. A valve or switch could be faulty, or the heater core could be a clogged.
Common signs include inconsistent cooling, out-of-date software, and uneven air distribution, since the module controls the whole AC system.
One of the most common issues with a heating system not functioning is dirty air filters. If your air filters are extremely dirty, then the airflow can be blocked. Check for clean air filters, vents, and registers. Make sure there are no rugs or furniture blocking vents or registers as well.
If you suspect that your blower motor may be malfunctioning, it`s important to have it checked and replaced if necessary. As you can see, there are several reasons why your BMW car heater may be blowing cold air. These include thermostat issues, low coolant levels, a blocked heater core, and blower motor issues.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Cold mist/smoke like air comes out of the air vents when cold air is on.
ANSWER : If you are using regular outside air a/c instead of recirculated air you may be getting a large amount of outside air humidity and can cause a mist to come out of the a/c vents. You should make sure the a/c evaporator drain is cleared and drains freely or the water in the a/c cannot drain fast enough and the blower will pick up the water and blow it out the vents.

Hot air mixed with cold blows from air conditioning
ANSWER : Hey there. You will most likely have to have a mechanic bypass the heater coolant lines to have this resolved. Your A/C may not be controlling the air flow inside the evaporator correctly out of the vents and may be the blend door actuator stuck in the heat position. Have the AC system diagnosed first before bypassing the heater.

Car was overheating almost to the red. I turned heater on, first it blew cold air then warm air for just a minute, then cold air.
ANSWER : Hi There,
The heater not working may be related to the overheating problem you are also having due to a faulty heater blower motor or potentially a bad heater core. As you may know, the heater core is a small radiator like unit that circulates the hot coolant from the engine through the heater core which then uses this warm coolant to heat the inside of the car with the help of the blower motor that blows the warm air through the vents inside the car. When the cooling system is not properly circulating coolant through the motor, this results in the warm coolant not being pumped through the heater core properly in order to warm the inside of the vehicle. In some cases there may be air pockets in the heater core which can cause the heating of the inside of the vehicle to fluctuate between warm and cool air erratically.

Engine overheating can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know the coolant fan switch helps to maintain the proper coolant temperature by turning on and off at specific temperature thresholds. When this switch is not working properly, this can cause the fans to come on intermittently, all the time or sometimes not at all. When this happens you will notice a temperature spike and drop occasionally as the fan comes on and off. When your thermostat is not working properly or is stuck closed, this will not allow the coolant to properly circulate through the engine, which may cause the engine temperature to fluctuate erratically or in some cases just remain hot. As mentioned above, this also restricts the warm coolant from flowing through the heater core which uses this to blow warm air into the cab of the vehicle. I would suggest having an expert from Your Mechanic come to your home to diagnose your cooling system.

Air conditioning blowing mildly cold air on the coldest setting, turned off/on again, now blowing cold air, should it be checked?
ANSWER : If you are getting ready for a long trip and suspect the cooling fan may be not coming on for the radiator and a/c then you should have the a/c and cooling system performanced checked before trip. Nothing worse than breaking down when out of town in a strange area.

My heater is blowing air through the driver side air vents but is blowing cold air through the passenger side and rear console ven
ANSWER : Hi there:

Climate controlled vehicles have multiple electrical relays that open and close vents to maintain the desired temperature. In some instances, these relays can wear out overtime. However, it’s also common for debris to clog up vents (especially side vents) which may restrict the flow of cool air. The best way to determine why your AC is not working efficiently, it might be best to have a professional mechanic complete a AC inspection; so they can pinpoint the source of your issues and recommend the right repairs.

Air conditioner doesn’t blow cold air
ANSWER : I would recommend having your 2003 Chevrolet Tracker’s condenser checked for hot spots. A hot spot will cause the refrigerant to remain hot, while it passes through that particular part of the condenser. Hot spots are usually caused by restrictions within the condenser.

If a hot spot is found, the condenser will require replacement in order to resolve the issue. In order to find a hot spot, an infrared thermometer will be used. This thermometer uses a laser pointer and whatever the laser is touching will read the temperature of.

This is a very useful tool in finding hot spots in radiators and condensers. If any hot spots exist, this will require opening the system back up and therefore will not only need a replacement condenser but a recharge of refrigerant as well. This service should only be performed by professionals with the correct tools due to the extreme dangers of refrigerant being released into the atmosphere or inadvertently inhaled.

I have a 2006 dodge charger 2.7 that has been overheating and the heater is blowing out cold air, warm air, and sometimes hot air
ANSWER : Hi there:

Overheating issues can be very difficult to pinpoint without completing a physical inspection. If your heater is not blowing warm air, it’s very possible that you have a clogged heater core coolant line; which can cause engine overheating or the heater core valve is damaged; which can also cause the same situation to occur. It’s best for you to have a professional mobile mechanic come to your location and complete a car is overheating inspection so they can pinpoint the source of your issues and recommend the right repairs.

My car heater will blow hot air and drive fine for 30 minutes then my heater blows cold air and my car overheats
ANSWER : Hello. With the recent repairs that have been made to the vehicle, there is only one main heating component that you have not looked into. This would be your heater core. The heater core is responsible for pulling hot coolant from the engine. This hot coolant runs through the heater core as the ambient air is pushed through to warm before entering the cabin. If the coolant can’t flow through the heater core, then the air will blow cold. This can be caused by a clog, a faulty switch, or a process known as electrolysis (electrical current running through coolant). Unless there is a clog that can be dislodged, these issues will all result in a new heater core. To get a precise diagnosis of the problem, I recommend having an expert inspect the overheating problem so this can be resolved.