Q: AIR CONDITIONER IS BLOWING HOT AIR. Does this mean its the compressor necessarily?

asked by on

Car is blowing hot air frm AC. Is the problem the compressor necessarily?

My car has 69000 miles.
My car has an automatic transmission.

Hello. I will be glad to help you with your Murano. A common cause of a "no cooling" condition is the system is low on refrigerant, however, inasmuch as your car is only 6 years old, if the refrigerant level is so low that the compressor won’t operate (low pressure cut off switch accounts for this) you probably have a leak that will have to be repaired.

If the system is not low on refrigerant and the A/C compressor is operating (a Mechanic can at least see if the clutch has engaged) first thing to check is whether the heater valve and/or blend door are possibly stuck thus operating the "heater" at the same time as the A/C. If that checks out OK, there is a basic diagnostic to get to the root cause: Via gauge readings, if there is adequate pressure in the system and yet the compressor is not running, there could be an electrical problem with the compressor clutch or wiring to the clutch.

The compressor can be forced to run by energizing the clutch directly. With the compressor running, a further check of the charge level is possible because you would be able to get low and high side readings of the running system. If the compressor runs when commanded and there is adequate refrigerant (as reflected in hi and lo side gauge readings), there is an electrical issue that has to be repaired. That could even involve faulty high and low pressure cut off switches in the refrigerant circuit.

If in the diagnosis, the system turns out to be "empty", that is gauge readings show no pressure, don’t bother re-charging as you have a substantial leak and the system will have to be opened up and repaired, with a new drier installed, prior to evacuation and recharging. The overall scenario or problem you are describing is fairly common (unfortunately, inasmuch as no a/c can be brutal in some climates) and thus I encourage you to simply schedule a diagnostic with YourMechanic because they will get the root cause identified quickly and then explain your repair options.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. AIR CONDITIONER IS BLOWING HOT AIR. Does this mean its the compressor necessarily?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Won't start - 2007 Nissan Murano

Hello there, you have several issues going on with your 2007 Nissan Murano. No-start issues are common and the most likely causes are the battery, starter, fuel pump, ignition switch, battery terminals or the battery cables. Given that your...

Q: Q: Air conditioner doesn't work

The AC condensers on these cars are known to leak, according to most owners that have had AC problems. Diagnosis of the inoperative AC depends on inspection of the AC condenser for leakage. The AC condenser is in front of...

Q: Average miles per gallon

Hi There, Assuming you are referring to the avg reading near the fuel mileage calculator, this relates to the average miles per gallon calculation that the computer calculates related to the fuel economy. This is nothing to worry about and...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...