Q: Low heat

asked by on January 12, 2017

Heat only works well when engine is operating at higher rpms, heater core was flushed in the fall and heat worked well for a little while but now it is the middle of winter and I have little to no heat again. I recently had the water pump and thermostat replaced so I don't believe it is either of those. any advice would be greatly appreciated
My car has an automatic transmission.

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