Nissan Air Conditioning Blowing Warm Air: Reasons Along with the Solutions

If your Nissan AC has suddenly stopped blowing cold, don’t sweat – the situation can likely be remedied. 

There are a handful of common issues that can cause warm air to start flowing from your car’s air conditioning.

Possible Causes For the Issue

There are many reasons why a Nissan’s air conditioner might start blowing warm air, including:

Low Refrigerant Levels

• Lack of adequate refrigerant is one of the most common reasons a car AC will no longer blow cold air. 

• A leak in the system allows the pressurized refrigerant to escape over time. 

• This causes reduced cooling performance.

Failed Compressor

• The function of the AC compressor is to pump refrigerant through the system, and failures can prevent the AC from providing cold air. 

• Electrical issues, worn clutch coils, or internal leaks inside the compressor can cause a complete system failure.

Clogged Condenser

• Dirt, bugs and debris on the AC condenser can restrict the proper airflow, which drives the cooling process. 

• Over time, an extremely clogged condenser will produce warm air from the AC vents. 

• According to most issues under this problem, a clogged condenser is the top culprit to blow warn air out of the vents. So, a thorough inspection is ideal to overcome any major issues in future.

Failed Pressure Cycling Switch

• The AC pressure switch monitors the refrigerant pressure and engages the compressor clutch when the pressure reaches a set point. 

• Faulty switch operation can cause intermittent compressor operation and warming air temps.

Malfunctioning Thermostatic Expansion Valve

• The function of the thermostatic is to expand the valve regulation of the flow rate of refrigerant into the evaporator core. 

• Problems with stuck open valves or clogging will result in poor performance and reduced cooling.

Faulty Blower Motor or Fan Speed Resistor

• Issues with blower motors that pushes the air across the evaporator, as well as the circuits that controls the fan’s speed, can mean warm air delivery due to lack of proper airflow even when the refrigerant system is working properly.

Solutions to Restore the Cold AC Operation

These are some solutions to bring back the cold air operation of a Nissan AC system:

Recharge the Refrigerant

• Recharging the AC with new refrigerant to top off the system and restore the pressure will often get the air cold again, especially if a leak was relatively slow.

Replace the Failed Components

• Swapping out non-functioning core components like the compressor, condenser, thermostatic valve, or blower motor can return the AC functionality and the cold airflow. 

• This typically requires a visit to an automotive AC speciality shop.

Flush the Contaminants and Debris

• In some cases, flushing out the AC lines, evaporator core, condenser, and hoses can remove the blockages from the buildup of contaminants that have restricted the refrigerant flow and cooling capacity over time.

Fix Any Electrical Connections

• Problems with broken or corroded wiring and connectors that are related to the compressor, pressure switches, and blower motor resistor can prevent these components from receiving the proper electrical signals for cold air delivery.

Frequently Asked Questions About Nissan Air Conditioning Blowing Warm Air

Q: What are some symptoms of my Nissan AC being low on refrigerant?

A: You may notice the engine running hotter than normal, lack of cold air when idling, strange smells from the vents, and the AC becoming less effective at cooling over time. These are signs refrigerant levels could be low.

Q: Why does my Nissan AC work less when sitting still?

A: If your Nissan’s AC struggles when idling, it likely indicates an issue with the compressor clutch or electrical connections. The compressor may be cycling on and off instead of remaining steadily engaged.