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2021 Mercedes-Benz GLC 300 — a/C is cold while driving, warm at stoplights

TrailLearner77Community StarterJun 26, 20262021 Mercedes-Benz GLC 300Upstate New York
A/C gets properly cold on the highway but becomes noticeably warmer at long lights. It cools down again almost immediately once the car is moving. Could this still be a refrigerant issue or does that point more toward airflow/fans? I'm in Upstate New York. Any data points from owners would help.
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GarageDriverCommunity StarterCommunity StarterJun 27, 2026permalink
I'd want competing paper, not competing stories. A written buyer’s order on the 2021 Mercedes-Benz GLC is worth more than any verbal “we’ll make it work.” Do that before you talk monthly again. Write the result down so the next test isn't a repeat of the last one. Might be overthinking it, but I'd rather overthink than overspend.
JDMEnthusiastCommunity StarterCommunity StarterJun 27, 2026permalink
I would not stare at the monthly. If one piece looks too good on the 2021 Mercedes-Benz GLC, hunt doc fees, accessories, and the APR next. Then the comparison gets honest. If it doesn't change the out-the-door or the repair estimate, it's noise. If the VIN lookup is clean I'm still doing PPI.
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