

Note: The dye check will not work if the system is too low and the compressor is not cycling.īad smells and odors coming from the air conditioningĪir Conditioners are prone to a build-up of bacteria, mold, fungus and other micro organisms.

Check where the evaporator drains condensation with UV light.Check where the hoses are crimped onto the fittings.Check the front seal and the o-rings sealing the pressure switches on the back of some compressors.Check hose manifolds on the compressor.Check around all fittings to verify that they are all secure.Using a UV A/C leak detection kit is the easiest way to find a leak.If pressure is low, then there may be a leak. Leaks are the most common problem associated with the air conditioning system. If the clutch is engaging and disengaging rapidly, the refrigerant may be low. Note: this is not the pulley, but the center piece that engages the pulley to the compressor shaft.With the engine running turn the A/C on max cool, set fans high, and make sure that the clutch is engaging on the compressor.If the clutch is not engaging, use a voltmeter to check for voltage getting to the compressor.If there is voltage - the clutch may be bad.If there is no voltage - a cycling switch may be bad, a fuse may be blown and the system may not have enough refrigerant pressure to trip the low pressure cutoff switch that cycles the compressor.

When diagnosing an air conditioning issue, it's easiest to begin at the compressor. The recommended high-side and low-side pressures can be found in the repair manual.

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