Question about 1991 Plymouth Grand Voyager

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No heat. temp goes up to normal but blows cold

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If the engine is running at proper temp you are looking at a few possibilities.......heater core plugged if you have used any sort of stop leak that can sometimes plug operating temp carefully check if both heater hoses feel as if they are the same temp(they will be about 1 inch thick,much smaller than the radiator hoses and will pass through the fire wall on the passenger side of the fire wall),If one is noticeably hotter\cooler you probably have a plugged heater core...................................................,maybe the system that changes hot to cold is not working...not sure which your voyager has but there are several ways the car manufacturers do this.....a cable,vacuum switch with vacuum lines,and an electric motor.There is a door in the heater box (behind your dash on passenger side..........not visible from the outside of the heater box though) and when the selector on the dash is on hot the door is in one setting And on cold another.I would start by removing the heater controls from the dash and check to see that the cable\wires\vacuum lines are in tact and go from there. A inexpensive repair manual can be obtained from your local parts store.most give detailed instructions and pics to guide you in repairing almost every part of your vehicle(i recommend the Haynes line of manuals)
hope this helps.......Good luck!

Posted on Dec 15, 2008

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You most likely have a stuck air temp blend door. In order to repair this check the actuator 1st, then is it is ok u will need to pull the dash to repair the door.

Posted on Dec 15, 2008


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