Blowing cold air
Did you drill by the passenger side to put mud guard? I did drill into the vacuum reservoir, and it went into default blowing cold air up the windshield check vacuum lines first.
Check the heater core see if you have flow threw it. and check the blower if blower is working refer back to the heater core. disconnect the lines and have one over the side of the jeep draining into a bucket and the other blow air threw. If no air goes threw then replace heater core. before replacing by pass it and flush cooling system.
Need to make sure you have enough coolant and if it does then it could be your thermostate or clogged heater core
SOURCE: 2000 Jeep Cherokee Air Conditioner
If compressor isn't kicking in, check the connector atop the a/c accumulator, beside the coolant recover tank, in the engine compartment. That connector is atop a black bottle, and the connector goes to the low pressure switch. These switches do fail, and you can jump a wire across the connector terminals to see if the compressor comes on (engine running). As this circuit provides part of the ground path from the compressor clutch, if the switch is open, the compressor will never turn on. If the switch is failed, it can be replaced without opening the a/c system. Just disconnect the connector, unscrew the switch, replace it, and reconnect the connector.
SOURCE: 98 jeep wrangler no heat
Try this disconnect the heater hoses from the heater core use a hose to backflush the core. Then reconnect and try again.
SOURCE: 97 Jeep Cherokee Heating problems
Verify that the hot water is being circulated thru the heater core by letting the car warm up to operating temp and carefully touching both heater hoses at the firewall where they enter the core. If you are sure that the water is flowing, the the blend door inside the ventilation housing is either not working, stuck, or not getting vacuum. This door directs the air to or away from the heater core depending on the temp control knob position. The system is activated by vacuum pressure, check all vacuum hoses from the engine to the firewall and also underneath the dash on the passenger side behind the ash tray.
SOURCE: 1992 Jeep Wrangler heater not blowing hot air
How often has the coolant been changed? My only guess is that it hasn't and the hoses and the heater core are plugged up with goo and a flush is needed
SOURCE: heat works on driver side, passenger side blows cold air.
Did you check your coolant level or was it low and you added to it at some point? If so the system my need to be bleed or worst case the thermostat is going bad.
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