A blockage here will prevent the refrigerant from entering the evaporator or recirculating through the refrigeration circuit. If the refrigeration circuit seems to be working (refrigerant in the system, compressor running and building pressure), but there is still no cooling, the problem might be an obstruction in the orifice tube (located in the high-pressure hose between the condenser in the front of the radiator, and the evaporator located in the passenger compartment). It may still have some pressure but not enough to trip the low-pressure safety switch so the compressor will engage. Simply depressing the service fitting valve with a small screwdriver to see if any refrigerant squirts out an accurate check is NOT because it tells you how much pressure is in the system. The gauge will tell you if there is any pressure in the system. Refrigerant ChecksĬonnect an A/C pressure gauge to the HIGH SIDE service port (located in the high-pressure hose that runs between the compressor and the condenser in the front of the engine compartment). If the compressor clutch engages and turns the compressor, but the A/C still does not blow cold air, the system is probably low on refrigerant and needs to be recharged. If the clutch engages but the compressor does not turn (the belt will start to slip and squeal), the compressor is locked up and you need a new compressor. If the compressor does not engage when you jump it, the problem is a bad compressor clutch. If the compressor works when you jump it, and the A/C blows cold air, the system contains refrigerant, and the fault is likely a bad A/C compressor clutch relay or a bad clutch cycling switch or pressure switch. If the compressor does not engage when you turn on the A/C, see if it will run by jumping the compressor clutch wire directly to the battery (use a fused jumper wire). Replace the motor that controls the blend air door. If so, the compressor is working and the A/C system probably contains enough refrigerant to make cold air, so the problem is inside the HVAC unit. Another possibility might be a blend air door inside the HVAC unit that is stuck in the HEAT position and is preventing air from flowing through the A/C evaporator. This can be caused by an electrical fault in the A/C compressor circuit or the magnetic clutch that drives the compressor.Īnother cause could be an internal obstruction inside the refrigerant circuit that is preventing refrigerant from circulating inside the A/C system. Another possible cause of no cooling may be that your A/C compressor is not engaging when you turn on the A/C. This is probably the most common cause of a no cooling problem. ![]() ![]() Your A/C system may have lost its charge of refrigerant. Is your car’s air conditioner blowing warm air only and no cool air? Your A/C cooling problem could be caused by any of the following:
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