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Pete, Technician
Category: Car
Satisfied Customers: 28247
Experience:  17 years automotive training and experience.
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Altima: My 2006 Altima 3.5 SL blows cold air out of the AC

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My 2006 Altima 3.5 SL blows cold air out of the AC with inside temperature at 72 degrees and the temp. control set at 90 degrees. Move the control one indent more and then hot blows to heat up the car. Acts like the temperature is locked at 90 degrees. The system has been looked at by the dealer and checked out 3 times - they say they fixed it - but when used for an half hour or so the problem is still there. Got any hints ?
My name is XXXXX XXXXX I am a professional here at Just Answer/Pearl. I noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.

From what you have described here this sounds like a possible evaporator temp sensor that is acting up.This sensor is used to determine how cold the ac evaporator is and to keep it from freezing up but shutting down the ac when it is to cold.

Since the ac freezes up when in use and the temp fluctuates like this here I suspect this is the sensor at fault needing replaced.In order to replace this sensor though the ac evaporator would need removed and can cos around 5 hours labor plus the cost of the switch to repair this.

I would have this sensor checked/tested to see if for sure it is at fault and if found to be the fault it needs replaced.

I hope this has helped and if you need anything else let me know.

Thanks Pete
Customer: replied 3 years ago.

Well, that is a possibility. It doesn't explain why the heat will not work until turned up to 90+ degrees. It will not control the temp. on heat also.

To be sure here does your vehicle use the automatic temp control with the auto feature on it?
Customer: replied 3 years ago.

Yes, it has auto or can be used in manual. Problem is the same in ether position.

And you only have heat when set to full hot or 90 degrees am I correct?
Customer: replied 3 years ago.

Correct, also if I move it one notch off of 90 it will go to as cold possible until it freezes off.

I was checking to see if there was a learn in procedure that needed to be done since you had replaced the control on the dash as some vehicles have to have this done when a repair like this is done but didn't locate anything required on this model here.Usually with this type of fault if the control and actuators are learned in properly this can correct this issue but I don't see this as an option on your vehicle here.

Your sun load sensor is located on the top passenger side of the dash,it can fail but usually doesn't cause this type of degree of temp difference here like this.Which makes me think this may be the in vehicle temp sensor at fault reading really hot so when you turn just one notch off of 90 it tries to cool the vehicle internally as it thinks the inside air is to hot inside the vehicle.Most likely this is why the evaporator may be freezing as well with the ac running all of the time as it continues to try and cool a vehicle that is already really cold.

This sounds like this in vehicle sensor may be the fault here and is located to the right and just below the ignition key cylinder.Make sure nothing is blocking the vent for this sensor inlet and if this is o.k. then this sensor may need replaced.

One way to find out for sure though is to have a scan tool plugged into the vehicle that can read the heater and ac data to see if this sensor is reading incorrectly.If it is reading that the interior temperature is way over 90 degrees when it isn't then it would need replaced.

Thanks Pete
Pete and 4 other Car Specialists are ready to help you

I am following up with you to see if you still needed help with your question you had asked.If my help didn't satisfy your question please let me know so we can continue.

Thanks Pete
Customer: replied 3 years ago.

Pete, I think you hit it right on the money, I was thinking the exact same thing was wrong but could not convince the dealer service dept. I just did not know were the sensor was located but you answered that. I am sure you are right and will change the sensor out as soon as I can. Working on a Ford Model A NW Regional Meet right now. It appears to me that the Ambient Outside sensor would be the same type as the in-vehicle sensor.

Thanks for your help - and I am satisfied with your answer.

Your welcome.Let us know if you need anything else in the future.

Thanks Pete