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The in carl temp sensor is the one in front of your right knee on the lower dash panel, the intake sensor is behind the glove box. There is a process to put your climate control into a self diag mode and you can see on the screen what the ambient temp sensor,in car sensor, and intake sensor temps. They should all be close to the same temp in comparison. The intake sensor will normally say -35 degrees or something crazy and thats the easiest way to know real quick that it is bad
G35. New suspension front and rear, ported plenum and manifold, coil overs, spec D ext
Originally Posted by JC77
I'm having an issue with my A/C recently. I just noticed it when it started getting cold here in Minnesota. My A/C will only engage when set to 60 degrees, when I bump it up to 61, it blows hot air. I saw the other threads about making sure the sensor and tube are plugged in under the steering wheel, which mine are. I noticed my coolant level in my reservoir is low, could that be the problem? Faulty cabin sensor? Bad fuse? Any ideas would be greatly appreciated.
Thanks
AC only working on the lowest setting, but displaying the correct outdoor ambient temperature, is probably the internal cabin ambient temperature sensor.
When sitting in the driver seat, right about where your gas pedal knee is located on the lower part of the dash is a "quarter slot" looking thing. This is the intake port for the cabin ambient sensor, make sure it's not covered up.
You can look up under the dash above the gas pedal to see the sensor and tube leading to that quarter slot intake, it has a wiring harness on it. Unfortunately there isn't a way to test this thing except with Consult-II / III. Fortunately it's easy to take off and I think it's the same part number used for ALL models of G35 and 350Z, even the V36 chassis even though it has a different shaped tube, you can swap the tube.
Just make sure the AC display actually shows correct outdoor ambient temperature, if that one is broken then the system will definitely not be functioning correctly. Fortunately they either work or they don't, no middle ground really. I do know it's kind of a chronic problem that water spraying on them like when going through a car wash will cause them to max out temp at 125F until they dry out again. They're prone to cracking and shorting out on the inside which just displays a maximum temp value.
Here's what that thing looks like.
Also check to make sure it's not related to SUNLIGHT shining on the dash, if the AC suddenly starts working when you're parking in the shade but not working when you're in direct sunlight then it could be the sunload sensor isn't compensating properly. It's a large round black plastic sensor on the dash up by the windshield.
Also make sure that cabin ambient sensor is sucking air, with the AC running you should be able to stick a single square of toilet paper over that intake grille and it will hold in place.
