Car Heater Not Working – Blowing Cold Air!

There are several reasons why your car’s heater may be blowing cold air, instead of heat. It is important to understand how the heater works in your car before you can begin to try to diagnose why it is not working. First, there is NOT an electric heater element in the heater system in automobiles, like in portable heaters used in the home. The part that transfers heat into the passenger compartment is called a heater core. A heater core can be thought of as a miniature radiator. The car engine’s coolant flows through the heater core while the fan (also called a blower), blows air through the heater core fins. When air blows through the heater core fins, it is warmed, therefore warming the passenger compartment.

Start by checking the coolant. As we already said coolant is what warms the heater core. So if the coolant is low, there may not be a sufficient amount of warmth to transfer heat to the air in the passenger compartment. Since it ‘s cold outside, low coolant may not effect the operating temperature of the engine significantly, so you won’t be alerted to a coolant problem by the temperature gage on the instrument panel. Once the coolant is full, feel the heater hoses that go through the firewall. With the engine at normal operating temperature, BOTH of the heater hoses should be hot to the touch. If only one is hot, this indicates there is is a blockage in the heater core or there is air trapped in the heater core. Using a Lisle coolant funnel is helpful in purging the air from the cooling system. If the coolant is really brown, has been neglected, or if “stop leak” has been used at some point, the heater core could be stopped up. The blockage can sometimes be unstopped by removing the heater hoses and using a garden hose with a sprayer to flush the heater core out. If neither of the hoses are hot to the touch, there could also be a malfunctioning heater control valve, if used on the model you’re working on. Check for presence of a heater control valve by following the heater hoses back to the engine. Sometimes, a vacuum line could have a break causing there to be no vacuum to operate the valve. Also it should be noted that if this is your first winter with this car (and you’re unfamiliar with the car’s repair history), the previous owner could have by-passed the heater core because of a leak. When a heater core leaks, usually they wet the passenger side floorboard. The labor cost to change heater cores is usually expensive, so sometimes people will loop the heater hoses and by-pass a leaking heater core instead of repairing it properly.

Next check for proper airflow. After you’re sure the heater core is getting hot water flow, read the following information. Doors within the heater case are either controlled by electric actuators, cables or vacuum motors. Adjust the heat control to both extremes while listening for movement of the blend door. With a cable operated heater door it’s easiest to hear the door thump when it closes. If the door is not operating, find the door that controls the airflow across the heater core. If there is an electric motor that controls the door, tapping on it can sometimes make it work temporarily for testing purposes. A vacuum operated motor needs vacuum to work, so using a handheld vacuum pump for testing is usually recommended. If the vacuum motor does not hold vacuum, the diaphragm is leaking requiring replacement. To go deeper into diagnoses of the control head’s function and diagnosis, specific vehicle repair manual information is needed. But hopefully the basics laid out in this article has helped to get you started on the right track. 

Some Safety Precautions When Working on a Hybrid Vehicle

There are many benefits to owning a hybrid vehicle. Probably the best reason to purchase one of these vehicles is in order to keep the pain at the pump at a minimum. Did you know that there are some precautions to take if you plan on working on one of these vehicles yourself though? First of all, it is true that working on a standard gas-only consuming vehicle is very much the same to working on a hybrid, but you should keep in mind that the battery voltage is much higher.

While each hybrid vehicle is different, each operates under the same principals. It has an internal-combustion engine like all other vehicles, but as a back up power supply, it possesses an electric motor as well. When it comes to working on hybrids, you should know that you are in for something completely different. These vehicles possess more computers and sensors, not to mention they pack a lot of power.

These hybrid vehicles feature high powered battery packs located at the back of the cars which can produce 200 to 275 volts of electricity at up to 80 amps. Honda hybrids produce 144 volts. Keep in mind that 50 volts is enough to kill some people. If someone has only had experience working on non-hybrid vehicles, they could easily make a mistake that could electrocute them pretty badly, even leading to death.

Therefore, if you work on cars and are thinking about working on your own hybrid, keep this in mind. Before you work on your new hybrid car, make sure you have read the manual. Reading a licensed repair manual, such as those prepared by Chilton or Haines would be a good idea as well. If you are a novice at car repair, you may want to leave it to the professionals. One of the best precautions to take though is to make sure that your vehicle is completely powered down before you attempt to work on it. Make sure that you have removed the keys from the ignition, as the vehicle will start the engine if the battery needs charging.

Some hybrid vehicles have already taken this potential danger into consideration. For example, Toyota has made all of the high voltage cables in their hybrid vehicles bright orange. This will be a big help in preventing you from making any spur of the moment mistakes. Also, in their Prius model, they have made it so that when the car is powered off, no power is running through these cables. Another precaution that has been taken in this car is the service plug located on the battery. When this plug is removed from the battery, no energy is able to leave it.

If you are the proud owner of a hybrid vehicle, there is no reason to get paranoid about working on your vehicle. It still remains a very safe endeavor, just as long as you are aware of the added danger and take the proper precautions in order to prevent it.