When it comes to diagnosing AC or heater core problems in a car, there are some common symptoms to look out for. Here are a few indicators that can help you determine if there might be an issue with your car's AC or heater core:
Lack of cold air or heat: If you notice that your car's AC is not blowing cold air or the heater is not providing warm air, it could be a sign of a problem. However, keep in mind that other factors like low refrigerant levels or a malfunctioning thermostat can also cause similar issues.
Inconsistent temperature control: If the temperature control knob or settings don't seem to have an effect on the air coming from the vents, it may indicate a problem with the AC or heater core.
Strange odors: Unpleasant or unusual odors coming from the vents when the AC or heater is turned on could suggest a problem with the heater core. A sweet smell might indicate a coolant leak from the heater core, while a musty odor might indicate mold or mildew growth in the AC system.
Leaking coolant: If you observe coolant leaking inside the car, particularly on the passenger side floor, it could be a sign of a faulty heater core. Leaking coolant may appear as a sticky or sweet-smelling liquid.
Foggy windshield: If you experience persistent fogging on the inside of your windshield when the defrost function is activated, it could be a result of a heater core issue. A malfunctioning heater core can lead to inadequate heat transfer, preventing efficient defrosting.
In any case, it is recommended to have a qualified mechanic inspect your vehicle if you suspect a problem with the AC or heater core. They can perform a thorough diagnosis to accurately identify the underlying issue and carry out the necessary repairs or replacements.