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Re: AC\Heater fan only blows slow speed. What is the...
Heater speed switch in passenger side in foot area above toes in heater box one wire plug on it 2- 5-6 mm screws hold it in that is your fan speed switch they are a common issue it is the season for those now usually you loose 1 speed at a time until nothing don't be caught with out that not working at all you windows will fog bad!!!!and no heat period.
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Have your a/c condensor fan checked out. It most likely is not working, or is not functioning at full speed. When you are driving air is being pushed through the condensor helping to keep your a/c cold, but when sitting in traffic there is no air flow if the condensor fan is not functioning at full speed.
I think you have a "variable speed resistor" problem, it's overheating. It's an electronic device usually located near or attached to the AC motor blower that controls the fan speed. This is a common problem with aging AC blowers with electronic controls.
Is the gauge showing the engine is warming up to normal temp ? Are the heater hoses getting hot ? If the heater core is getting hot, it could be a blend door problem. The blend doors direct air thru the heater core and the ac evaporator among other things.