A car heater that has stopped working can make a cold day even worse. The heater in your car, truck or SUV depends on several components in order to work properly. When one or more of these start to fail, the performance of your heater and defroster can diminish considerably. You can wind up dealing with a heater that only blows cold, or in some cases, doesn’t blow at all. Supplies You May Need for This Job:
1. Safety Glasses:
2. Gloves:
3. Blower Motor:
4. Blower Motor Resistor:
5. Cabin Air Filter:
6. Coolant/Antifreeze:
7. Heater Blend Door:
8. Thermostat:
9. Heater Control Valve:
10. Heater Core:
0:00 Welcome Back
0:15 Tips
0:44 Blower Motor
1:11 Cabin Air Filter
1:33 Check Coolant
2:01 Thermostat
2:30 Heater Core
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#OReillyPowered #CarHeater
#Diagnostic #CarMaintenance
First things first: a little basic maintenance is important, which means making sure your antifreeze, or coolant, is at the proper level. Your vehicle’s manufacturer will recommend the type of coolant you should use… the ratio of coolant to water… and the ideal interval between each coolant flush. If any of these factors are ignored, they can lead to other problems.
So, if you’ve noticed your heater isn’t working for one reason or another—or isn’t working well—there are a number of possible causes.
If you can’t get any air to blow at all, it’s not specifically a heater issue… it may be a fuse… or a blower motor issue. Check the fuse first, and replace it if needed. If it’s not the fuse, in many cases a blower motor is also a fairly straightforward replacement that you can do yourself.
When your heater blows warm air, but you can’t adjust the speed of the fan, it’s likely your blower motor resistor, which is also typically a simple repair. Another possibility, especially if you have poor air flow or notice odors from the vents, is a clogged cabin air filter.
There can also be issues with a heater’s blend door or actuator, which control not only how air is routed into the cabin—including settings like floor, defrost or re-circulation—but also the ability to fine-tune the specific temperature of the air coming through the vents.
If you’ve got a situation where air is blowing, but isn’t warm, start by checking your coolant level. If it’s low, there may not be enough to flow from the engine to the heater core, where warm air is blown into the cabin of your vehicle. One of the concerns if your coolant level is low is the possibility of a leak. Keep an eye out under the front end of your vehicle, especially if you’ve had to top it off more than once. Low coolant levels can quickly cause your engine to overheat, which may cause additional damage.
Another possible cause for a heater that won’t blow warm air is a malfunctioning thermostat. Your thermostat opens and closes to regulate the temperature of the coolant inside the engine. Until the engine warms up, the thermostat should remain closed, which helps your engine and heater warm up. If the thermostat is stuck in the open position, you might notice that the gauge stays on “C” for a long period of time, or it may just never seem to reach its normal operating temperature. Coolant in the heater core below this temperature may not be warm enough for normal heater operation.
Other possible causes are a bad heater control valve or heater core, which can both cause the air not to blow warm or to blow warm only intermittently. The heater control valve controls the flow of coolant to the heater core when the heater or defroster is turned on.
*View full video for complete instructions**
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