If the air conditioner in your Nissan Rogue starts blowing hot air instead of cold, it’s usually an indication of a refrigerant leak or problem with the AC system.
Therefore, read on to find these details.
Table of Contents
Common Causes and Solutions for the Issue
- The most common cause of warm air from the AC vents is a refrigerant leak.
- The AC system relies on refrigerant to produce cold air. If the refrigerant level gets too low due to a leak in the system, it won’t be able to cool the air properly.
- Signs of a leak include warm air even when the AC is on max settings, reduced cooling efficiency over time, and an oily residue along the refrigerant lines.
- Taking it to a mechanic to locate and seal the leak is crucial.
AC Compressor Failure
The AC compressor is responsible for pumping refrigerant through the system. If it fails, refrigerant won’t flow properly, and the system loses its ability to cool the air.
Common signs are:
- Unusual noises from the compressor.
- Seized compressor components.
- Warm air from the vents.
Replacement of the entire compressor unit is usually required to fix this issue.
Clogged AC Condenser
- The condenser is responsible for emitting heat that is absorbed from the air.
- If dirt, debris, and pollution build up on its fins, it can’t dissipate heat efficiently.
- This causes refrigerant pressure issues and warm air.
- Carefully cleaning the condenser with compressed air or a speciality spray can help to restore the proper air conditioning function.
Blown AC Fuse
- There is an AC fuse that provides power to the blower motor and compressor.
- If it blows, the components won’t turn on.
- Check this fuse in the fuse box that is usually located under the hood or under the dashboard, and replace it if faulty.
- If it blows again, there may be an electrical issue that needs professional inspection.
Faulty Blower Motor Resistor
- The blower motor resistor controls the fan speed power.
- If it fails, the power cannot reach the blower motor properly.
- This may result in no cold air, intermittent function, or, in some cases, only some fan speeds may work properly.
- The fix involves replacing the cheap resistor component.
Low Refrigerant Pressure Sensor Issues
- This sensor measures pressure on the low-pressure side of the AC system.
- If readings are inaccurate, it provides faulty data to the other side of the AC components by causing a strange behaviour.
- The sensor may needs to be replaced if diagnosed as the issue.
Finding the Exact Location of the Leak
Pinpointing the source of a refrigerant leak in the AC system can be tricky.
Some common leak locations to check in a Nissan Rogue include:
- AC lines: The hoses and pipes that connects the AC components like the condenser, evaporator, and compressor are prone to leaks over time as the rubber lines degrade and connections loosen.
- Condenser coil: Small holes or cracks often form over years of wear and corrosion in the delicate condenser coils.
- Service ports: The ports used to add refrigerant to the system can leak if caps become loose or damaged.
- Compressor shaft seal: The seal around the compressor shaft prevents the internal refrigerant from escaping. If worn out, it can leak intermittently as the compressor cycles on and off.
Frequently Asked Questions About Nissan Rogue AC Blowing Hot Air
Q: Does a refrigerant leak means that I need a whole new AC system?
A: Not necessarily. If the leak is detected early enough, the leak can often be sealed up without replacing any major components.
Q: Is it safe to drive if my AC is blowing hot air?
A: Yes, you can safely drive a Nissan Rogue with a non-functioning AC. There is no risk of engine overheating or other problems. The only problem that may arise is that the cabin may feel uncomfortably hot in warm weather.