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Turn off heater/air conditioner and accelerate briskly. If noise does not occur problem is probably a regulator in the heater/air conditioning system located under the dash.
weak engine, heat, engine coolant must be 180F or more at all times
hot. if not the heater will be weak.
unless you failed to notice the heater fan speeding up. that would
be gross 12 DC power issues, dead battery or, bad charge system.
Sounds like a heater core issue. The heater core my be clogged so water will only flow in it when you are accelerating. Easy way to check is to turn the heat on while the truck is running, find the two lines running to your heater core and see is both are the same temp. If the heater core is clogged then only one line will be warm/hot.
this sounds like the coolant is low and should be checked.when you accelerate the coolant flows faster through the system.when at idle or driving slow the air will accumulate at the highest point which is usually the heater core thats why when in this state you get cool or luke warm air out the vents.
If I may ask, what color was the antifreeze that you took out of your car? If the coolant is not actually overheating, the coolant temperature sensor could be bad. Check the routing of the serpentine belt. It is possible to get the belt on wrong and turn the water pump in the wrong direction, which would cause overheating because the coolant would not be circulating as it should. That would also prevent the heater from working since the coolant would not be flowing through the heater core.
sound like th efan is not working, not the heater, acceleration cause the air to move through the vent, so if the fan is not working, there is nothing to move the air, even the heater is working.
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