Car AC Not Working? How to Fix Common Air Conditioning ...

Author: Fatuma

Oct. 28, 2024

Car AC Not Working? How to Fix Common Air Conditioning ...

Diagnosing Your Vehicle's Air Conditioning Troubles

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1. Is Your AC Blowing Air That’s Cool but Not Cold?

When your air conditioning is set to maximum cool and operating at high fan speed, yet it only emits moderately cool air, there are a few steps to consider:
First, inspect whether the cooling fans associated with the condenser or radiator are functioning when the AC is activated. Additionally, look for obstructions such as leaves, insects, or dust that might impede airflow over the condenser.
Furthermore, ensure that the cabin air filter is clean and not obstructed. If these checks are fine, utilize a manifold gauge set to monitor the system pressures. You can refer to the vehicle's repair manual or online resources for the appropriate high-side and low-side pressure specifications. Once your gauges are affixed, observe the AC compressor for any anomalies.

Related: Is Your Car AC Blowing Hot Air? Discover How to Resolve It

2. Investigate the AC Compressor First

Beginning your diagnosis at the compressor can simplify the troubleshooting process:
With the engine running, set the A/C to maximum cooling, adjust the fans to high speed, and ensure that the clutch is engaged on the compressor. Note that it’s the center piece engaging the pulley, not the pulley itself. If the clutch frequently engages and disengages every few seconds, it may indicate low refrigerant levels. You will observe the low-side pressure on the gauge decreasing rapidly during engagement, dropping to a low level before disengaging, causing a pressure increase. While replenishing refrigerant, the gauge should stabilize with the compressor running at recommended pressure.

  • If the clutch is inactive and the refrigerant is present, use a voltmeter to check if voltage reaches the compressor.
  • If there’s voltage, the clutch might be faulty.
  • In the absence of voltage, possibilities include a defective cycling switch, a blown fuse, or insufficient refrigerant pressure preventing the low pressure cutoff switch from activating the compressor.

Related: Steps to Replace a Car AC Compressor

3. Leakages Often Result in System Failure

Leakage ranks as a primary concern for many air conditioning system faults. If system pressure is low, it likely points to a leak:

  • Utilizing a UV AC leak detection kit is a straightforward method to identify a leak. Follow the manufacturer's guidelines to introduce UV dye into the system, then utilize a UV light to locate the leak.
  • Inspect all fittings to ensure they are secured tightly.
  • Examine the hose manifolds surrounding the compressor.
  • Check seals and O-rings on the pressure switches found at the rear of certain compressors.
  • Review hose crimping onto the fittings.
  • Investigate Schrader valves.
  • Search for tiny holes in the condenser.

Be sure to inspect areas where the evaporator drains water using UV light, as oil or dye may be visible. Remember: dye detection won’t work effectively if the system is significantly low and the compressor isn’t cycling.

Additional Components to Inspect if Issues Persist

The AC Compressor and Its Clutch

The AC compressor operates as a pump that circulates refrigerant (Freon) throughout the air conditioning system.

Potential Issues: Leaks may occur at one or more seals or even within the compressor itself. Additionally, particle contamination caused by wear within the compressor can be a frequent issue. The engagement component, referred to as an AC clutch, may become non-operational, leading to compressor failure.

What to Monitor: In cases of low refrigerant, visually inspect for leaks that might appear green and oily. Ensure internal components haven’t failed due to normal wear and tear or low AC oil levels caused by leaks. Confirm the AC clutch functionality and power supply to it, which can be disrupted by a blown fuse, a faulty pressure control switch, the dash control module, or compromised circuit wires. Always perform inspections and tests before proceeding with replacements!

Related: What is the Cost to Replace a Car AC Compressor?

AC Accumulator / Drier

The accumulator/drier is responsible for collecting and eliminating moisture from the system. Excess moisture can damage internal components and is detrimental to the AC compressor.

Issues to Note: Internal failures can allow desiccant to circulate within the AC system, leading to catastrophic issues similar to having sugar in a gas tank. Over-saturation of the desiccant through leaks can cause compressor malfunctions.

The AC Orifice Tube / Expansion Valve

This component regulates and filters the refrigerant flow throughout the AC system. Depending on your vehicle, you might find an orifice tube or an expansion valve.

Common Problems: Contamination is a leading cause of failure. If system pressures are excessively high or low, the expansion device may be responsible. However, verify refrigerant levels and ensure that the radiator/AC condenser fans are operating correctly. Again, inspect and test prior to any replacements!

The AC Condenser

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Resembling a radiator, the AC condenser functions alongside the radiator fan(s). When air flows over the condenser tubes, it cools the hot refrigerant vapor collected from within the vehicle, transforming it back to a liquid state before it moves to the evaporator core to absorb further heat.

Possible Issues: Common concerns include refrigerant leaks or blockage from contaminants originating from the AC compressor or AC accumulator/drier that can limit refrigerant flow, ultimately leading to inadequate cooling performance. Additionally, check the radiator/AC cooling fan motor(s) during your AC condenser checks.

The AC Evaporator Core

The AC evaporator acts like a large ice cube filled with holes, allowing hot cabin air to circulate through the core, rapidly cooling it before blowing it back into the passenger area. This cool air from the dash vents is provided with the help of the AC heater blower motor assembly.

Common Problems: The leading cause of failure is leakages arising from age and wear. Utilizing an electronic leak detector is the most efficient method for leak detection. Pay attention to the AC evaporator drain tube for potential leaks. Larger leaks may manifest as a green, oily residue inside the drain tube.

Related: What are the Costs Involved in Replacing Your Car’s Air Conditioning System?

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