Should coolant be brownish in color? I have air

no the coolant that year should be green,its either got oil in it,which i doubt as it would be very oily, its probably just very old and dirty i would flush that out before winter,it could have had a coolant leak and someone added stop leak to it and thats what gave it that color,but that stop leak stuff blocks the heater cores up,,,or you could have a stuck thermostat as to why you got no heat

No, it should not. Most coolants are green in color and occassionally some manufaacturers use an orange colored coolant