Cold air usually means that the radiator or the is not the radiator or the cooling system is low on coolant or there could be a problem with thermostat change the thermostat in front by the engine first it's an expensive see if this helps if not it could be the heater core clogged as well which is something that happens also
Mate, cheapest way to troubleshoot this, is remove the heater core hoses in the firewall, hook up a garden hose, have someone gently turn up the tap, flush the system from one hose connection first, the the other... this will remove any blockage which could be from installing a new rad to sludge in the system..
Also check fuses and relays, then check and/or replace the the blower motor resistor. It is an electrical component that is a part of the vehicle's heating and air conditioning system. It is responsible for controlling the blower motor's fan speed. ... A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system... cheers
Check the heater core
SOURCE: Just replaced Blend Door - Temp now Reversed!
never done one ?? but from what you describe you have fitted an actuator arm back to front
SOURCE: 2004 Jeep Grand Cherokee blend door replacement
its not the door its self that doesn't work,it is opened by a vacume valve and closed with a vacume valve,and it is not an easy job even for a mechanic
SOURCE: 1996 jeep grand cherokee heater sometimes blows
well you might have a vaccum leak try looking for a loose hose in the front by the engine look at the hose diagram in your truck and make sure all the hoses are properly connected and in good condition this might solve your issue. good luck let me know how it went.
SOURCE: I have a 2001 Jeep Grand Cherokee. Originally blew
either bad recirc doors or a possible bad heater core. Open the hood and when the car is warmed up to mid point on the temp gauge look on the passenger's side firewall under the hood. You will see 2 black rubber hoses running through the firewall. Feel each hose and if one of the 2 are cold then you have a bad heater core. Otherwise most likely the recirc door.
SOURCE: 2003 Jeep Cherokee Overland---Blower works
possibly some other part affecting the blend door if you feel ac air or no heat
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