Usually a thermostat will fix it, could be low coolant, heater control, wrong thermostat (should be a 195 degree) or restriction in the heater core or cooling system also.
I had the same problem with my 98 jimmy I repalaced the water pump have had heat since.
try it to be sure
It will do 100.
NO.
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yes
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255Hp 310FT lbs Torque