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I woild be checking the vent controls as if the ac is working and the core was blocked then the air would be cool when the heat was selected but not changing Fixing the heater has resulted in a /c not being good enough to cool the air if the vent is not properly selecting. The point is that if the vent selection is not working properly (vacuum hoses) then the 2 faults will be related.
You need to verify that warm coolant is getting to the heater core by touching the hoses going into the firewall. If they are both the same temp or close, you might have a blend door actuator broken or sticking that does not direct warm air into cabin area
check the heater hoses going from motor thru firewall to heater core / if they get warmer when motor is at 2000 rpms or higher then most likely problem is heater core stopped up / if the hoses dont change then thermostat could be stuck open ! good luck
The heater core can be stopped up or thier might not be enought coolant in the system as it has to be full for the heater to heat. The engine also has to warm up so if the therromstate were opening too much and the engine does'nt warm up the water will be too cold and the heat won't work. Remove the heater hoses at the motor conections and blow them though If they are Ok they'll blow though real easy. The cars cooling system does'nt blow very hard and is stopped up real easy. Blowing though with a garden hose reconnect and refill with antifreeze and your good to go. If it does'nt have enough antifrezze it could be frozen and the ice won't cicculate. If this has happened you may need to put the car in a garage to warm it up drain the light antifreeze coolant and put in good coolant withthe right amount of antifreeze.
Let the vehicle warm up to normal operating temprature, touch the heater hoses going into the firewall to the heater core, they should both be hot, if only one is hot the heater core is stopped up. If this is the case you will want to try flushing it before you replace it. If you have to replace it be prepaired to spend $400.00 or more depending on shop rates. NOTE: BE CAREFULL WHEN CHECKING HEATER HOSES YOU COULD GET BURNED! Thanks and good luck with your repair.