Make sure there is vacuum going into the passanger compartment. There should be a vacuum line from the intake manifold goung into the cab. GoodluckJoe
Heater Core is the likely culprit
Disconnect the negative battery cable.Discharge and recover the air conditioning system refrigerant.Disconnect the refrigerant lines from the evaporator. Plug the openings to prevent contamination.Disconnect the refrigerant lines from the accumulator. Plug the openings to prevent contamination.Remove the accumulator.Drain the cooling system into a clean container for reuse.Disconnect the heater hoses from the heater core tubes.Remove the PCM from the dash panel and move it aside. Do not disconnect the PCM harness connector.In the engine compartment, remove the heater/air conditioning housing assembly-to-chassis nuts.In the passenger-s compartment, remove the heater/air conditioning housing-to-dash panel nuts.Pull the heater/air conditioning housing assembly rearward far enough to clear the studs and air conditioning drain tube holes.Remove the heater/air conditioning housing assembly from the vehicle.Remove the upper-to-lower heater/air conditioning housing screws and remove the upper housing.Remove the heater core from the lower housing.
There is no valve, it is probably clogged up.
Yes, replacing the heater core should slove the problem.
Discharge and recover the air conditioning system refrigerant.Disconnect the refrigerant lines from the evaporator. Plug the openings to prevent contamination.Disconnect the refrigerant lines from the accumulator. Plug the openings to prevent contamination.Remove the accumulator.Drain the cooling system into a clean container for reuse.Disconnect the heater hoses from the heater core tubes.Remove the PCM from the dash panel and move it aside. Do not disconnect the PCM harness connector.In the engine compartment, remove the heater/air conditioning housing assembly-to-chassis nuts.In the passenger-s compartment, remove the heater/air conditioning housing-to-dash panel nuts.Pull the heater/air conditioning housing assembly rearward far enough to clear the studs and air conditioning drain tube holes.Remove the heater/air conditioning housing assembly from the vehicle.Remove the upper-to-lower heater/air conditioning housing screws and remove the upper housing.Remove the evaportor core from the lower housing.
It should be in the heater blower motor case which is located under the glovebox.
the heater blower motor resistor is bad, it is located near the heater. under the dash on the glovebox side.
Sorry bad news Your heater core has a leak
Bypass the air conditioning on a 1998 Dodge Stratus with a smaller serpentine belt.
they should be coming to the dealers by March.
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