I had a similar problem on my 2000 Cherokee. I believe my problem was air trapped in the heater core. I drained and refilled the system, but it wouldn't blow hot.

The small underhood space for the radiator and hoses leads to air being trapped in the system. Factory probably should have installed an air bleed near the thermostat.


1970 Plymouth Barracuda 1994 Ram 1500 4x4 5.2L 2004 Ram 1500 4x4 5.7L Quad Cab