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Mike V.
Mike V., Infiniti Mechanic
Category: Infiniti
Satisfied Customers: 23827
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: 1 year ago.
Category: Infiniti
Expert:  Mike V. replied 1 year ago.
Hi there,Is this something that suddenly happened?Have you added freon or anything at this point?
Customer: replied 1 year ago.
Suddenly happened. We checked freon pressure and it read over 200psi
Expert:  Mike V. replied 1 year ago.
You have over 200 psi without the compressor running?
Customer: replied 1 year ago.
Yes, but it is 109 degrees here and the car is really hot.
Expert:  Mike V. replied 1 year ago.
Ok, give me just one moment please to get some info on these pressures.
Customer: replied 1 year ago.
Compressor was not running when we took freon pressure - sorry!
Customer: replied 1 year ago.
Car was off.
Expert:  Mike V. replied 1 year 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 1 year ago.
Yes. I turned temp down to 60 and it blew hotter air.
Expert:  Mike V. replied 1 year ago.
Ok, does the car have left and right temp control?Different diag for the different styles.Let me know.
Customer: replied 1 year ago.
Yes. There is a separate temp control for passenger.
Expert:  Mike V. replied 1 year 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 1 year ago.
Ok, going to do it now.
Expert:  Mike V. replied 1 year ago.
Thanks
Customer: replied 1 year ago.
Having a problem getting it into self diag mode. Engine on and then hold start button for 5 secs?
Expert:  Mike V. replied 1 year ago.
Yes, within 10 seconds of starting the engine.
Customer: replied 1 year ago.
We got it. What are we looking for here?
Customer: replied 1 year ago.
In climate control. Steps 2 & 3 ok
Expert:  Mike V. replied 1 year 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 1 year ago.
When it gets to 41 what do we do?
Customer: replied 1 year ago.
We hit the defrost button to have it go 41 through 46. When will we see the codes you sent us?
Customer: replied 1 year 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 1 year ago.
HERE is page 2. So sorry for missing that!
Customer: replied 1 year ago.
Ok, we got to step 7. Code 51 we hit defrost button and it says 19 ????
Customer: replied 1 year ago.
Plus no Full Cool during 41 and 42. Compressor did not turn on.
Customer: replied 1 year ago.
We are outside, btw
Customer: replied 1 year ago.
19 just turned 18 .. Now 17
Customer: replied 1 year ago.
16
Expert:  Mike V. replied 1 year 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 1 year ago.
Maybe, where is the pressure switch located?
Customer: replied 1 year ago.
Is it difficult to get to?
Expert:  Mike V. replied 1 year ago.
i am sorry, I have to take a small break, then I will be back!
Customer: replied 1 year ago.
We are taking it to a mechanic.
Expert:  Mike V. replied 1 year ago.
Ok, please let me know what they find, I am really suspecting the pressure sensor for your a/c causing this