Car Heater Not Working?

Try these easy steps to pinpoint the problem—and stop the chill.

Is your car heater not working, and you’re worried about freezing solid when winter arrives?  Well, here are some car maintenance tips to guide you on what to troubleshoot—and when to take your vehicle in for service.

Check your blower motor (fan).
Start here when troubleshooting heater issues. The fan controls the speed at which the warm air comes out. If your fan isn’t blowing any air, have your technician check it out. If the fan comes on but the flow isn’t strong enough—or if the air isn’t warm enough—follow the rest of this checklist.

Replace the cabin air filter.
Check your owner's manual to see if your vehicle is equipped with a cabin air filter and, if so, where it’s located. When this filter is clogged with dirt, dust, bugs or other debris, you’ll experience a decrease in airflow through the vents. You may be able to replace this filter yourself—or you can have it checked and replaced (if necessary) as part of The Works™ package.

Clear the air intake.
Do you park your vehicle under trees? Your heater can be affected when leaves—or snow or other debris—block the air intake, which is the vented area between the hood and windshield on the outside of your vehicle. Remove any obstructions. If the air intake is clear and the blower is running but you still aren’t getting enough air volume, the problem probably lies elsewhere—keep reading.

Check your vents for vacuum system leaks.
Your vehicle’s vacuum/electrical system directs air to the feet, vents or defroster. It also mixes hot and cold air to give you the desired cabin air temperature. Check each of the vents to make sure air comes out as intended. If not, you may have a vacuum leak. Older vehicles, especially, can develop vacuum leaks that can cause heater problems. Take your vehicle to a trained technician to inspect and fix this issue.

Check your coolant system.
If your heater isn’t working and the coolant level is abnormally low—i.e., below the minimum line marked on the coolant reservoir tank—it’s time to have the coolant system examined for leaks. Quick automotive lesson here: Your engine produces heat, which is transferred to the engine coolant. The coolant then travels, via hoses, to the heater core. The blower motor sends air across the heater core, and the resulting warm air moves through the vents to your car’s interior. To make this system work, you must have both the proper water/coolant level and a working thermostat. If your coolant isn’t leaking, your technician may need to check your thermostat. When it’s stuck in the “open” position, the coolant won’t get hot and your heater won’t function properly.

Now that you’ve located the problem, you’re well on your way to warmth this winter!


Source: My Ford Magazine