Heater blows cold air when stopped or ideling
I own a 2010 Ford Taurus SHO and am having problems with the heater. When the car is sitting still, it blows cold air but as long as you are traveling it blows warm. If you stop at a red light or stop for any reason, it will begin blowing cold air again. Have had it back to the dealer and they can not figure it out.
If the dealer can't figure it out... The cold air is because there is not enough water flowing through the heater core. The car is too new to have a worn pump but it could be a slipping belt. I'm sure that the temperature is normal & thermostat checked and all the usual causes in a older car.
If you have 2010 taurus 3.5 your water pump is chain driven off the timming chain not belt driven
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