No heat in 98 jimmy. Replaced water pump, radiator, hoses, thermostat, actuator door, and flushed heater core still no heat. Automatic ac when on heat does not blow out front vents at all and when switched to manual heat cold air blows out. Is there a heat sensor and where is it? Could something have gone wrong when actuator door was replaced?
Possibly.. the actuators which operate the doors actually have a position signal for reference, but the actual motors inside the actuators dont realize there is a limit and overshoot their limits causing the fine wires inside to rip apart rendering the actuator scrap but this happens when actuators are still plugged in to the connector while being taken off the heater door, and they can and will still move with the key in the off position if the actuator thinks it not in the proper position..thats how they work anyway.hope you had them unplugged untill the last, then this would'nt happen....hope this explaination helped
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