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Mike V.
Mike V., Infiniti Mechanic
Category: Infiniti
Satisfied Customers: 25681
Experience:  Factory trained to repair Nissan and Subaru.
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Infiniti G37 Journey: The AC in my 2008 Infiniti G37 coupe

Customer Question

The AC in my 2008 Infiniti G37 coupe is blowing hot air. It would appear the compressor clutch is not engaging. Is there a fuse or relay for the ac?
Submitted: 2 years ago.
Category: Infiniti
Expert:  Mike V. replied 2 years ago.
Hi there,Is this something that suddenly happened?Have you added freon or anything at this point?
Customer: replied 2 years ago.
Suddenly happened. We checked freon pressure and it read over 200psi
Expert:  Mike V. replied 2 years ago.
You have over 200 psi without the compressor running?
Customer: replied 2 years ago.
Yes, but it is 109 degrees here and the car is really hot.
Expert:  Mike V. replied 2 years ago.
Ok, give me just one moment please to get some info on these pressures.
Customer: replied 2 years ago.
Compressor was not running when we took freon pressure - sorry!
Customer: replied 2 years ago.
Car was off.
Expert:  Mike V. replied 2 years ago.
lol, that's ok, I am just a bit surprised to see such high pressure without the compressor running. It's safe to say there is freon in the system that's for sure. I assume the car has auto climate control correct?
Customer: replied 2 years ago.
Yes. I turned temp down to 60 and it blew hotter air.
Expert:  Mike V. replied 2 years ago.
Ok, does the car have left and right temp control?Different diag for the different styles.Let me know.
Customer: replied 2 years ago.
Yes. There is a separate temp control for passenger.
Expert:  Mike V. replied 2 years ago.
Ok, there are several sensors that could be causing the issue. What I would like to have you do is follow this link and put the system into self diag mode. This will test the appropriate sensors so we can determine if they are causing the issue or not, then we can work on it from there.HERE is the link, please let me know
Customer: replied 2 years ago.
Ok, going to do it now.
Expert:  Mike V. replied 2 years ago.
Thanks
Customer: replied 2 years ago.
Having a problem getting it into self diag mode. Engine on and then hold start button for 5 secs?
Expert:  Mike V. replied 2 years ago.
Yes, within 10 seconds of starting the engine.
Customer: replied 2 years ago.
We got it. What are we looking for here?
Customer: replied 2 years ago.
In climate control. Steps 2 & 3 ok
Expert:  Mike V. replied 2 years ago.
Should be producing codes on the display if there is a problem with any of the sensors. It should automatically hit all the doors and the temp sensors, then when done show codes. Code 21 is normal if you are inside.Sending you a list of codes we are interested in.
Customer: replied 2 years ago.
When it gets to 41 what do we do?
Customer: replied 2 years ago.
We hit the defrost button to have it go 41 through 46. When will we see the codes you sent us?
Customer: replied 2 years ago.
(Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  Mike V. replied 2 years ago.
HERE is page 2. So sorry for missing that!
Customer: replied 2 years ago.
Ok, we got to step 7. Code 51 we hit defrost button and it says 19 ????
Customer: replied 2 years ago.
Plus no Full Cool during 41 and 42. Compressor did not turn on.
Customer: replied 2 years ago.
We are outside, btw
Customer: replied 2 years ago.
19 just turned 18 .. Now 17
Customer: replied 2 years ago.
16
Expert:  Mike V. replied 2 years ago.
Ok, we have nothing in the 20's so I think the sensors are good. I am thinking the issue is with the pressure switch. Can you make a jumper wire for the pressure sensor under the hood if I get you the location and wires to bridge?
Customer: replied 2 years ago.
Maybe, where is the pressure switch located?
Customer: replied 2 years ago.
Is it difficult to get to?
Expert:  Mike V. replied 2 years ago.
i am sorry, I have to take a small break, then I will be back!
Customer: replied 2 years ago.
We are taking it to a mechanic.
Expert:  Mike V. replied 2 years ago.
Ok, please let me know what they find, I am really suspecting the pressure sensor for your a/c causing this