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I just purchased a 2007 Nissan Altima that has a AC/Stereo…

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i just purchased a 2007...
i just purchased a 2007 Nissan Altima that has a AC/Stereo Problem. The Stereo will not come on and the ac will blow air but its not getting power to the compressor to kick on. We were told they thought the ECU but wanted to get a 2nd opinion.
Submitted: 9 months ago.Category: Nissan
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Answered in 9 hours by:
10/13/2017
Nissan Mechanic: Jay, Nissan Technician replied 9 months ago
Jay
Jay, Nissan Technician
Category: Nissan
Satisfied Customers: 21,692
Experience: 20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer
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Hello my name is ***** ***** thank you for your question.

This is 2 different concerns. The AC concern could simply be that the system is low on freon. If low on freon the compressor will not come on.

The Radio issue, did you check fuses?

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Customer reply replied 9 months ago
Fuses have been checked and it’s not low on Freon.
Nissan Mechanic: Jay, Nissan Technician replied 9 months ago

Why would you think it's not low on freon?

What is the Radio doing exactly?

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Customer reply replied 9 months ago
Freon was checked at a shop - it’s not turning on at all.
Nissan Mechanic: Jay, Nissan Technician replied 9 months ago

How did they check it exactly? do you know? Did they recover the freon from the system to determine how much was in it and then recharge it? or did they just push the service valve to see if it has freon?

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Customer reply replied 9 months ago
They actually recovered and recharged
Nissan Mechanic: Jay, Nissan Technician replied 9 months ago

Ok.. Does the AC light come on when you turn the AC on?

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Customer reply replied 9 months ago
Idk I have to check
Nissan Mechanic: Jay, Nissan Technician replied 9 months ago

Ok.. let me know

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Customer reply replied 9 months ago
Did the ecu thing make any sense
Nissan Mechanic: Jay, Nissan Technician replied 9 months ago

Not sure.. There are checks you need to do to determine that. A ac pressure sensor is likely. Ecm is very uncommon

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Nissan Mechanic: Jay, Nissan Technician replied 9 months ago

But as for the radio, if the fuse is good and getting power, I have seen where they get signal jammed and get knocked out. Simply disconnecting the negative battery cable for 15 mins could restore operation. If not, you could have a internal failure in the radio.

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Customer reply replied 9 months ago
Is ac pressure sensor an expensive fix?
Nissan Mechanic: Jay, Nissan Technician replied 9 months ago

It's about 80 to 90 bucks. But the AC system would need to be recovered again, then installed, and re-charged.

But if the AC light is coming on, then I would not think it's a AC pressure sensor. I would then check to see if the compressor is getting power. Monitor if the IPDM is turning on the Compressor.

The AC pressure sensor does talk to the Ecm, and then the Ecm would command the IPDM to turn the compressor to come on

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Nissan Mechanic: Jay, Nissan Technician replied 9 months ago

It is possible it's a Air Controller or a AC pressure sensor. But as I said, it would need to be properly to verify which is causing this.

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Customer reply replied 9 months ago
I think they said the compressor isn’t getting power.
Nissan Mechanic: Jay, Nissan Technician replied 9 months ago

So, it could be a AC pressure sensor or Air Controller. But as I said, it would require the proper checks to determine that.

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Nissan Mechanic: Jay, Nissan Technician replied 9 months ago

That would tell me that the controller is operating, so it could possibly be a AC pressure sensor

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