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Q: low engine heat on 1994 Chrysler LeBaron

recently replaced radiator, thermostat, and hoses. first time I needed heater after that, no, or very little temp output from heater. reservoir full. temp gauge goes up only 1/4 or less up from cold. after pulling long hill or mountain, temp gauge reads 1/2 to 3/4, and heater puts out good heat, but quickly drops to cool as engine temp drops. blend doors on heater work good, all functions, including a/c work great, just cannot get engine temp up to normal(1/2) or better, to maintain heat. engine cooling fan only runs when temp goes high, or on a/c or defrost mode. keep mostly on panel output to avoid fan running. no leaks. any suggestions? problem started after changing parts mentioned earlier. even put back old t-stat, didn't help
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