Lawsons Automotive & Motorcycle Repair/Performance
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Below are just a few examples of typical Symptoms and Fixes your car might be experiencing
The AC isnrsquot blowing cold air because the cabin air filter is clogged the blower motor is faulty...
The air conditioner isnrsquot working because of a faulty compressor clutch cracked evaporator core ...
The car is overheating after turning the air conditioning on because of a faulty coolant temperature...
The car air conditioner fails sometimes because the cabin air filter is too dirty the ldquomoderdquo...
The vinegar smell is probably due to moldy substances built up in the air conditioning system This c...
Below you can find information about other fixes
A bad evaporator sensor typically causes your vehicle's air conditioner to stop working, freeze too much, or blow warm air. The evaporator temperature sensor tells your vehicle's brain (the computer) to either drop or increase the temperature to dodge a freeze-up; it acts like a thermometer to prevent things from getting too cold or hot inside, protecting wires, circuits, etc. The evaporator temperature sensor sits behind your dashboard, near the glove box.
A faulty evaporator temperature sensor can cause the air conditioning system to behave erratically. Since this sensor monitors the temperature of the evaporator to prevent freezing, a malfunctioning sensor might give incorrect readings, causing the A/C to cycle on and off too frequently or not blow cold air at all. This results in fluctuating cabin temperatures and an uncomfortable ride.
If the sensor incorrectly detects that the evaporator is too cold, it may send signals to shut off the A/C compressor prematurely, preventing the system from cooling properly. On the other hand, if the sensor fails to detect freezing temperatures, the compressor might stay on too long, which can lead to an overworked system, increased wear, and potential damage to other A/C components.
A defective evaporator temperature sensor might fail to detect when the evaporator is too cold, allowing moisture to freeze on the coils. Over time, this ice buildup can block airflow, reducing the effectiveness of the A/C and causing the system to struggle to cool the cabin. If ice forms, you may notice weaker airflow or even a complete loss of cold air until the ice melts.
If the sensor incorrectly tells the A/C system that the evaporator is already cold when it isn’t, the system may stop cooling even when you need it. This can result in warm air coming from the vents even though the A/C is turned on.
The evaporator helps remove moisture from the air before it enters the cabin. If the sensor malfunctions and prevents the A/C from functioning correctly, it can lead to higher humidity levels inside the vehicle, making the air feel damp and uncomfortable.
In some cases, a completely failed evaporator temperature sensor may prevent the A/C system from turning on at all. This happens because the climate control system relies on this sensor to regulate cooling operation, and without a proper reading, it may default to a fail-safe mode, shutting down the system entirely.
On some vehicles, a failing evaporator temperature sensor can trigger the Check Engine Light (CEL) or an A/C system warning light. If the vehicle’s onboard computer detects incorrect temperature readings or a failure in the sensor circuit, it may store a trouble code, which can be retrieved using a diagnostic scan tool.