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. Low side pressure values R134a vs R1234yf Ambient Temperature If you recharge your Cobalt AC without accounting for ambient temperature, the system could over pressurize when the ambient temperatures get warmer. ![]() The refrigerant pressure is affected by the outside atmospheric temperature. Ambient temperature affect on refrigerant pressure It is also cryogenic and can cause severe frostbite when it comes in contact with the skin. Warning: Wear gloves and safety glasses before recharging the AC to avoid accidental exposure to harmful chemicals in the refrigerant. Note: See next section for recommended pressure values. Shake the canister briefly and release the refrigerant into the system until the recommended pressure has been achieved.The recharge kit will only properly connect to the low pressure port, and will not fit the high pressure port. Note: If the ports are not labelled, try connecting the recharge kit to both unlabeled ports on the AC hoses. Remove the cap from the low pressure service port labelled L, and connect the AC recharge kit.Turn on the AC and set it to the coldest setting, and the fan speed to maximum.This information is typically located under the hood and/or in the owners manual. Check which type of refrigerant your vehicle uses.You can recharge your AC through the low-pressure port with a do it yourself AC recharge kit. One is labelled H for high-pressure and the other one is labelled L for low-pressure. There are two ports in the air conditioning system of Cobalt. How to recharge AC refrigerant in Chevy Cobalt When the refrigerant leaks again, the leaking component will shine under UV light. The leak can be diagnosed by injecting small amount of fluorescent dye into the AC system. Refrigerant leak in Cobalt can be caused by leaking O-ring seals, leaking condenser or evaporator core, or a cracked hose. If the refrigerant level goes down again quickly, it means there is probably a leak. Just have it refilled and you can drive with pleasant temperatures again. If you don’t service the AC system in your Cobalt for a long time, the refrigerant level will eventually get so low that the system loses its cooling capacity and the airflow may also be restricted due to ice formation on the evaporator coil. ![]() Ideally, the refrigerant should never leak in a properly sealed AC system, but most car AC systems do leak small amount of refrigerant over time due to minor imperfections and will need recharging after every few years. Recommended videoĪ low refrigerant level in your Cobalt does not necessarily mean there is a leak. As a rule, there is no avoiding a change if the filter is dirty. Therefore, the filter performance will not increase significantly even after cleaning. Unfortunately, this procedure does not allow you to get into the deeper layers of the filter. This can be done, for example, with a vacuum cleaner or a compressed air system, removing at least a large part of the visible dirt particles. Instead of changing the cabin air filter in Cobalt, it is often recommended to first clean the filter. If you drive your vehicle in dusty or polluted environment, the filter can get dirty much sooner than manufacturer’s recommendation. ![]() There is no prescribed time for changing cabin air filter, but most manufacturers recommend a change after 10,000-20,000 miles. It also puts unnecessary strain on the entire AC system which negatively impacts the fuel economy. A dirty filter causes the overall ventilation of the interior to deteriorate resulting in reduced cooling and airflow. The pollen filter, also known as the cabin air filter or microfilter, is responsible for filtering the air that the passengers breathe in the cabin. Dirty AC filter is the leading cause of weak AC airflow in Chevy Cobalt.
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