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Does the pump just fails at once? Does it relate to the ac unit? I'm having issues with the ac not working properly at low speeds and/or traffic lights, the other day temp light came on yellow and turned red as I was getting on the ramp to the expressway. Once I got some speed light went out and ac started to work normally.
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Could be the electric fan behind the radiator is not operating correctly, and once you have the car up to speed to enough airflow through the radiator, both the A/C and cooling is operating (without the fan.) I'd check that the fan is running at significant speed (it's variable speed) when stopped with the A/C running. I can hear the fan spool up when I'm stopped and switch on the A/C.