7 Reasons Your Car Heater Blows Cold Air | Quick Easy Fix
Is your car heater blowing cold air leaving you shivering on your commute? Don’t worry, you’re not alone! There are several reasons why this might happen, but the good news is that many of them are relatively easy to fix yourself.
In this video, we’ll diagnose the 7 most common causes of a car heater not blowing hot air:
Low Coolant Level or Leaks: The coolant transfers heat from the engine to the heater core. If the coolant level is low or there’s a leak, the heater core won’t have enough hot coolant to warm the air.
Stuck Thermostat: The thermostat regulates engine temperature by controlling coolant flow. If it’s stuck open, the engine won’t get hot enough, and the heater core won’t have hot coolant.
Clogged Heater Core: Over time, the heater core can become clogged with debris, restricting coolant flow and reducing heat transfer.
Jammed Blend Door: This flap controls the mix of hot and cold air. If it’s jammed, it might prevent warm air from reaching the vents.
Faulty Heater Control Valve (Older Cars): This valve regulates coolant flow to the heater core. If it’s malfunctioning, it could prevent hot coolant from reaching the core.
Air Bubbles in Cooling System: Air pockets can disrupt coolant flow and prevent proper heat transfer.
Malfunctioning Heater Fan: The fan blows air over the heater core for circulation. If it’s not working, you might feel lukewarm air instead of hot air.
We’ll also show you how to diagnose each cause and provide solutions for fixing them yourself, saving you money on a trip to the mechanic.
In addition to the video, check out this handy guide for even more details on diagnosing car heater problems:
Car AC Not Blowing Cold Air When Idle: 5 Causes + How To Fix?
This guide is also helpful:
#carrepair #carproblems #carmaintenance
Timecode:
00:00:00 – Introduction
00:00:03 – Reasons for heater blowing cold air
00:00:47 – Low Coolant Level
00:01:20 – Stuck Thermostat
00:01:53 – Clogged Heater Core
00:02:07 – Jammed Blend Door
00:02:46 – Faulty Heater Control Valve
00:02:58 – Air Bubbles in Cooling System
00:03:18 – Malfunctioning Heater Fan
00:03:42 – Diagnosing each cause
00:03:47 – Diagnosing Low Coolant Level and Coolant Leaks
00:04:30 – Diagnosing a Stuck Thermostat
00:04:40 – Diagnosing a Clogged Heater Core
00:05:24 – Diagnosing a Jammed Blend Door Actuator
00:05:39 – Diagnosing Air Pockets in the Cooling System
00:06:12 – Diagnosing a Malfunctioning Heater Fan
00:06:29 – Conclusion
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