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With that year deville...its more than likely the blower motor
clean the heat filters
Low coolant. If the coolant is low then the heater core is not able to transfer heat in to the car.
my 94 explorer wont blow heat
Fuses blow, in any application, when the current in the circuit exceeds the limit preset by the fuse selection. It is also possible, if the fuse terminals are corroded, for heat to be generated, causing the fuse to melt, giving the appearance of having blown.
I own a 1997 Ford Contour and there was a recall a few years ago on the heater blower and resistor. Check out the recalls on the car.
An air conditioner blows out heat
Blower motor switch. Put it on High and it will blow when sitting still with the engine running.
You don't say the reason for the blower motor replacement. Did it not blow ? If that be the case, and you do have a new blower, check for 12 volts to blower. Could also Abe a malfunctioning blower module. Now if its blowing COLD air, well , replacing the blower moter wont make it blow warm. There could be numerous causes of that problem
Because most likely there is still coolant circulating through the system.
passenger side temp acuator has gone bad
the heat blows out the defrost when it should blow out floor vents only