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2006 Mazda RX-8 — a/C is cold on the highway but warm at stoplights

NewCarRoadie849Community StarterMay 20, 20262006 Mazda RX-8 SportDenver
2006 Mazda RX-8 Sport, about 67,000 miles. The A/C works well with road speed but gets noticeably warmer at long lights, then cools again almost immediately once moving. Does that point more toward airflow/fan behavior than refrigerant level?
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4 replies

DailyTraveler76Community StarterCommunity StarterMay 20, 2026permalink
Ask what changed right before it started. Swap the cheap/easy piece first on the 2006 Mazda RX-8 and see if the fault moves. Don't erase codes until someone who can help has seen them. This is from a 2006 Mazda RX-8 in Denver with 67,000 miles. If they can't show the line item, I assume it's hiding. No warning lights, which is why I'm documenting it.
DailyTraveler76Community StarterCommunity StarterMay 21, 2026permalink
Start with the test that can prove you wrong. Capture voltage while the 2006 Mazda RX-8 is actually failing — after it restarts you've lost the clue. Save the big job until that test fails. This is from a 2006 Mazda RX-8 in Denver with 67,000 miles. If they can't show the line item, I assume it's hiding. If it repeats twice more I'll book time.
ColdStartCamper961Community StarterCommunity StarterMay 21, 2026permalink
Ask what changed right before it started. Capture voltage while the 2006 Mazda RX-8 is actually failing — after it restarts you've lost the clue. Save the big job until that test fails. This is from a 2006 Mazda RX-8 in Denver with 67,000 miles. Keep sale price, fees, and rate as three different conversations. I'm in no rush to be a hero on it.
BoostShopper780Community StarterCommunity StarterMay 22, 2026permalink
Same neighborhood, different next step: If a shop can't duplicate it on the 2006 Mazda RX-8, bring a video plus freeze-frame data, not just a story. Save the big job until that test fails. On “8 — a/c is cold on the,” that was the fork that mattered for me. This is from a 2006 Mazda RX-8 in Denver with 67,000 miles. Write the result down so the next test isn't a repeat of the last one. This is the filter I use when the thread starts repeating itself. Next check is the cheap one I can do in a driveway.
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