Dirty vs clean AC evaporator coil comparison. Over time, these particles build up on the fins and block the air flow through the evaporator, causing reduced air flow in the cabin and poor cooling. The cabin air filter captures most of the dirt or other airborne particles, but some particles escape and can get lodged on to the evaporator. Dirty evaporatorĭirty evaporator can also cause Cobalt AC to blow hot air. You can use pressure washer for cleaning, but make sure its at low pressure setting, as high pressure can damage the delicate fins on the condenser. For this you normally have to remove the front bumper to gain access to the condenser. If the condenser is dirty on your Cobalt, the simplest solution is to clean it. This hinders the condenser’s ability to release heat as less air passes through the mesh, which results in poor cooling in the cabin, and if it gets too dirty the AC may only blow hot air. Over time, grime, bugs and other small particles can build up on its surface and in the gaps of its mesh. The air conditioning system in Chevy Cobalt has a condenser coil that sits at the front of the vehicle, and is responsible for releasing the heat from the refrigerant into the ambient air. If the pressure is higher than the recommended pressure, let some refrigerant out preferably into a rag to avoid exposure. Low side pressure values R134a vs R1234yf Ambient TemperatureĬonnect the pressure gauge to the low pressure (L) port in Cobalt. Check your vehicle’s owners manual or look under the hood to find the type of the refrigerant your vehicle uses. The pressure values based on ambient temperatures differ depending on the type of the refrigerant. Most modern vehicles use R-134a refrigerant, but newer vehicles are increasingly using R-1234yf as a more environmentally friendly replacement. So, even if you recharged your Cobalt AC at the recommended pressure, the system could still over pressurize when the ambient temperatures get warmer. The refrigerant pressure is affected by the outside atmospheric temperature. Ambient temperature affect on refrigerant pressure An overcharged system not only affects cooling performance but can also damage the compressor and sometimes can cause a major leak. Just like with low refrigerant, the AC in Cobalt will blow warm air only if the AC system is overcharged with refrigerant. Note: See next section for recommended pressure values.
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