Which parts fail
Components named in complaints (air conditioning, heater, defroster, HVAC controls).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2003 Infiniti G35 owners, lightly cleaned up (personal details are redacted by NHTSA).
The radio will turn off by itself and turn back on a few seconds later. All of the buttons in the center console become inoperable. The A/C controls also become inoperable and turns on by itself. It just doesn't turn on though, it turns on 90 degrees and starts blasting out. This is a safely issue because as a driver we never know when this air is just going to start blasting out at us like fire. If Infiniti is Smart enough to recall the sedan, they should do the same thing with the coupes. It is clearly a common problem among the '03-'04 models. If they want to keep their reputable name they will do what is right.
Tl* the contact owns a 2003 Infiniti G35. Upon starting the vehicle, the contact noticed that the air conditioning system and radio failed without warning. The vehicle was taken to an independent mechanic, but was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 80,000. Updated 09/21/15
The ac/radio controls go out intermittently on by 2003 G35, even though a few G35's were covered under a voluntary service campaign - my VIN # was not on list - ac now stuck on and snow is due in 2 days! Infiniti says not a safety hazard and they will not cover???? I not a safety hazard in cold weather I don't know what is.. There are 100's of post similar to mine on internet - when is someone going to talk some since into Infiniti. This is the thing that is keeping me from ever buying another Infiniti - not so much the problem, things happen- but it the way Infiniti is handling it. They know it was an engineering boo boo and they are refusing to take responsibility. They need to grow up!!!
The climate control system malfunctioned. The blower went to the highest level and could not be adjusted using the controls. The display panel for the radio also went blank. Tried to turned everything off but the controls did not work, therefore had to turn the car off. Once the care was off I turn it back on and the fan blower was at medium, and I was still not able to adjust the temperature, defroster or other controls including the radio from the panel. I was able to adjust the radio from the steering wheel. The next day everything began to work. Approximately one month later the same thing occurred lasting about two days before everything began to operated again.
The audio and temperature controls become inoperable because of a known issue with the audio finisher circuit board. My temperature was stuck at 90 degrees at maximum output, with no possible way to shut it off. There was a voluntary recall for 2003 G35 sedans with this issue (Infiniti recall # p31040), but not for coupes. From online research, there appears to be numerous cases where the same issue has occurred on 2003 G35 coupes, but Infiniti refuses to accept responsibility for repairs, because the VIN #'s were not part of the original recall. I believe this is a safety defect that constitutes a recall for any G35 model with this known issue.
Air conditioning blasts at all times that car engine is running. No way to control, lower or change the A/C defroster, heat or defogger. Radio panels are similarly "blacked out" meaning they are not within the control of the operator. Multiple safety complaints have been issued regarding this problem and the dealership has advised similar owners it will be $4,000 to rectify this problem. This is largely a safety concern. I have notified my insurance company of this issue as when Toyota's were recalled and people were injured it was the insurance company, (state farm) that realized the severity of the situation first.
Tl contact owns a 2003 Infiniti G35. The radio, heater and air conditioning console had an electrical failure. He notified an Infiniti dealer in reference to a recall, and was advised that the recall repair had previously been performed. The contact has to pay $1,300.00 to repair the vehicle. A representative from the manufacturer advised him that if he did not drive a hour and a half to an authorized dealer for an assessment, they would not provide any assistance. The current and failure mileages were approximately 85,000. Updated 11/10/09 the rear window defroster was inoperative. Updated 11/13/09.
Tl contact owns a 2003 Infiniti G35. The contact noticed that the air condition would sporadically fail. The failure worsened and included the radio and cd player as well. The manufacturer stated that there was a voluntary recall for the equipment:electrical:radio/tape deck/cd etc.; however, they would not repair the vehicle for free because his VIN was not included in the recall. The VIN ranges are jnkcv51e*3m000014-026621. The contact is in the process of repairing the audio finisher circuit board at the cost of $1,400. The recall number was unknown. The failure and current mileages were 64,000.
Recently the audio/air conditioning control unit is inoperative. The display on the audio source goes blank. Since I can't control my heat/cool setting I feel helpless when I want to adjust for comfort. I have been reading a few complaints about the issue and it seems like the have a volunteer service recall for the circuit board, but it only covers through April 2002. My vehicle was manufactured on December 2002. Can you tell me if their has been an adjustment to the service recall that would put me in a better position?
1) no specific event - one day stopped working. 2) climate control panel failed in ac "on" mode at 66'f. Cannot turn off. Cannot access defrost/rear defogger buttons. Creates unsafe vehicle as lack of defrost/defogger prevents driver from seeing clearly in certain weather conditions. 3) told by infinity consumer affairs that sedan VIN does not fall into range of existing recall for ac/auto circuit board by Nissan (Infiniti). Requires consumer paid diagnostic to determine what failure mode is causing problem.
AC & Heater complaints in other G35 years
Frequently asked questions
How common are ac & heater problems on the 2003 Infiniti G35?
NHTSA has 44 complaints about the a/c & heater of the 2003 Infiniti G35, 8% of the model year's 533 complaints. The component named most often is defroster/defogger/hvac system (26 mentions).
Is there a recall for 2003 Infiniti G35 ac & heater problems?
No. NHTSA lists no a/c & heater recall for the 2003 Infiniti G35, though it has 5 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2003 Infiniti G35 ac & heater problems start?
Half of the complaints with a recorded mileage happened before about 93,000 miles, and 2% before 25,000 miles.
Is it dangerous?
Owners linked 1 crash, 0 fires and 0 injuries to a/c & heater problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.