2013 Infiniti G37 — a/C is cold on the highway but warm at stoplights

This is usually cheaper to test than to guess. Two 2013 Infiniti G37s can feel identical and have different causes, so measure before you copy someone else's repair. If the cheap test changes it, stop and reassess. Write the result down so the next test isn't a repeat of the last one. Make the next action something you can finish this week. Doing the boring step first on purpose.

Log the conditions before you spend. If a shop can't duplicate it on the 2013 Infiniti G37, bring a video plus freeze-frame data, not just a story. If the cheap test changes it, stop and reassess. On “a/c is cold on the highway but,” that was the fork that mattered for me. Stop there until you know. Not driving it hard until I know more.

Intermittent stuff lies if you only catch it once. Move a coil or plug on the 2013 Infiniti G37 if it's cylinder-specific and see whether the code follows. That's the branch I'd chase this week. On “a/c is cold on the highway but,” that was the fork that mattered for me. Time, temperature, and whether it's in gear are the notes that actually help a shop. If your situation is the opposite, ignore me. If this is nothing, great. I want that in data.

OP here — recorded a short video and noted speed, temp, and whether it was in gear. Happens in gear, not in park, for what that's worth.

I wouldn't throw parts yet. Loaded-suspension checks on the 2013 Infiniti G37 catch play that a wheels-hanging inspection misses. Save the big job until that test fails. This is from a 2013 Infiniti G37 in Las Vegas. If you share a photo of the worksheet, easier to sanity-check. I've seen both outcomes, which is why I'd test instead of assume. If that fails I'll eat the diagnostic fee.

If it were in my driveway, swap the cheap/easy piece first on the 2013 Infiniti G37 and see if the fault moves. Don't erase codes until someone who can help has seen them. Any freeze-frame data saved? I'd rather be boring and correct. I'm in no rush to be a hero on it.

I'd want a measurement, not a hunch. Two 2013 Infiniti G37s can feel identical and have different causes, so measure before you copy someone else's repair. If the cheap test changes it, stop and reassess. Write the result down so the next test isn't a repeat of the last one. Not driving it hard until I know more.

Ask what changed right before it started. A pressure test beats staring at a dry driveway if the 2013 Infiniti G37 is losing coolant with no puddle. Save the big job until that test fails. If it doesn't change the out-the-door or the repair estimate, it's noise. I'd rather pay for diagnosis than a second guess-repair.

Intermittent stuff lies if you only catch it once. Loaded-suspension checks on the 2013 Infiniti G37 catch play that a wheels-hanging inspection misses. If the cheap test changes it, stop and reassess. On “a/c is cold on the highway but,” that was the fork that mattered for me. A shop burned me once by skipping that step. Wrote this up on my lunch break.

I wouldn't throw parts yet. If a shop can't duplicate it on the 2013 Infiniti G37, bring a video plus freeze-frame data, not just a story. Save the big job until that test fails. Verbal 'we'll take care of it' is not a plan. That's my plan before I call anyone.

I'd want a measurement, not a hunch. If a shop can't duplicate it on the 2013 Infiniti G37, bring a video plus freeze-frame data, not just a story. Don't erase codes until someone who can help has seen them. This is from a 2013 Infiniti G37 in Las Vegas. If they can't show the line item, I assume it's hiding. I'm in no rush to be a hero on it.