2019 Audi S4 — temperature climbs in traffic but drops once moving

I wouldn't throw parts yet. A pressure test beats staring at a dry driveway if the 2019 Audi S4 is losing coolant with no puddle. That's the branch I'd chase this week. Happy to compare notes if your setup is different. Worth doing even if the car feels fine right now. Parking it somewhere I can hear it better next time.

Log the conditions before you spend. Loaded-suspension checks on the 2019 Audi S4 catch play that a wheels-hanging inspection misses. That's the branch I'd chase this week. On “temperature climbs in traffic but drops once,” that was the fork that mattered for me. This is from a 2019 Audi S4 in Dallas with 70,000 miles. Do that first. If that fails I'll eat the diagnostic fee.

Log the conditions before you spend. Get a real battery/charging test on the 2019 Audi S4, not just resting voltage, before blaming a module. Don't erase codes until someone who can help has seen them. On “temperature climbs in traffic but drops once,” that was the fork that mattered for me. This is from a 2019 Audi S4 in Dallas with 70,000 miles. Do that first. Not interested in a five-hour wait for a shrug.

Start with the test that can prove you wrong. Move a coil or plug on the 2019 Audi S4 if it's cylinder-specific and see whether the code follows. That's the branch I'd chase this week. This is from a 2019 Audi S4 in Dallas with 70,000 miles. I'd want that in writing, not as a promise. Your commute and mine probably aren't the same, but the test still applies. If that fails I'll eat the diagnostic fee.

Intermittent stuff lies if you only catch it once. Move a coil or plug on the 2019 Audi S4 if it's cylinder-specific and see whether the code follows. If the cheap test changes it, stop and reassess. On “temperature climbs in traffic but drops once,” that was the fork that mattered for me. Verbal 'we'll take care of it' is not a plan. I'd rather pay for diagnosis than a second guess-repair.

Start with the test that can prove you wrong. Loaded-suspension checks on the 2019 Audi S4 catch play that a wheels-hanging inspection misses. Don't erase codes until someone who can help has seen them. Did the worksheet show tax yet? Your commute and mine probably aren't the same, but the test still applies. Next check is the cheap one I can do in a driveway.

I wouldn't throw parts yet. If a shop can't duplicate it on the 2019 Audi S4, bring a video plus freeze-frame data, not just a story. That's the branch I'd chase this week. Do that first. Cold start is when I can actually reproduce it.

If it were in my driveway, capture voltage while the 2019 Audi S4 is actually failing — after it restarts you've lost the clue. If the cheap test changes it, stop and reassess. That's the whole play. I'd sleep better after that step, even if it finds nothing. No warning lights, which is why I'm documenting it.

It did temperature climbs in traffic but drops once twice this week, both times after sitting. No change in mileage feel. Might be overthinking it, but I'd rather overthink than overspend.

It did temperature climbs in traffic but drops once twice this week, both times after sitting. No change in mileage feel. Heat soak after errands is the other window.

Ask what changed right before it started. Loaded-suspension checks on the 2019 Audi S4 catch play that a wheels-hanging inspection misses. Don't erase codes until someone who can help has seen them. This is from a 2019 Audi S4 in Dallas with 70,000 miles. Any freeze-frame data saved? If that fails I'll eat the diagnostic fee.

This is usually cheaper to test than to guess. Move a coil or plug on the 2019 Audi S4 if it's cylinder-specific and see whether the code follows. Save the big job until that test fails. This is from a 2019 Audi S4 in Dallas with 70,000 miles. Run the total, not the monthly, before you commit. That's my plan before I call anyone.

Intermittent stuff lies if you only catch it once. Swap the cheap/easy piece first on the 2019 Audi S4 and see if the fault moves. Save the big job until that test fails. On “temperature climbs in traffic but drops once,” that was the fork that mattered for me. Run the total, not the monthly, before you commit. I'll poke at it this weekend.

If it were in my driveway, a pressure test beats staring at a dry driveway if the 2019 Audi S4 is losing coolant with no puddle. Save the big job until that test fails. Was this after sitting overnight? Not trying to scare you — just skip the expensive first guess. Cold start is when I can actually reproduce it.

Log the conditions before you spend. Capture voltage while the 2019 Audi S4 is actually failing — after it restarts you've lost the clue. If the cheap test changes it, stop and reassess. On “temperature climbs in traffic but drops once,” that was the fork that mattered for me. This is from a 2019 Audi S4 in Dallas with 70,000 miles. When does it actually happen? Happens in gear, not in park, for what that's worth.

I wouldn't throw parts yet. Get a real battery/charging test on the 2019 Audi S4, not just resting voltage, before blaming a module. That's the branch I'd chase this week. I'd want that in writing, not as a promise. I'd rather look cautious in this thread than stuck later.

Start with the test that can prove you wrong. A pressure test beats staring at a dry driveway if the 2019 Audi S4 is losing coolant with no puddle. If the cheap test changes it, stop and reassess. I'd want that in writing, not as a promise. I'd rather look cautious in this thread than stuck later.

Intermittent stuff lies if you only catch it once. Two 2019 Audi S4s can feel identical and have different causes, so measure before you copy someone else's repair. That's the branch I'd chase this week. On “temperature climbs in traffic but drops once,” that was the fork that mattered for me. Stop there until you know. If your situation is the opposite, ignore me. I'd rather look cautious in this thread than stuck later.

If it were in my driveway, if a shop can't duplicate it on the 2019 Audi S4, 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. If the story changes I'll post the new data.

This is usually cheaper to test than to guess. A pressure test beats staring at a dry driveway if the 2019 Audi S4 is losing coolant with no puddle. Save the big job until that test fails. That's the whole play. Make the next action something you can finish this week. Not driving it hard until I know more.