2002 Nissan Altima - Heat doesn't get hot and doors get stuck
I had the air conditioner control unit replaced because the knob that switches from cold to hot was broken. The heat still blows warm air. The mechanic said that I need a heater control box because when he turns the new knob from cold to hot, the doors get stuck due to corrosion around the bushing(?). Nissan said that I just might need to replace the actuators, the blower resistor and all three doors.
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Re: 2002 Nissan Altima - Heat doesn't get hot and doors...
Did the switch break because it was stuck? If so, then yes, they will have to change actuators and doors. Does the fan work on all speed setting? If so then you do not need a blower resistor. The resistor pack only controls the current flow to change speeds of the fan.
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you may have a problem with heater box. your air/mix door may have an issue. feel the knobs on the control unit. if the cold/heat know feels kinda funny from the other knobs, then thare is a problem with heater box/cables??
i would look at the l/h side of air box assembly in the car. right abobe the gas pedal in the center of vehicle (center comsole) you will see a black box (good size). there is a small (white ) gear that falls out from the air mix door and causes no heat issues, because the door cant move. look there first. if the small white gear fell off, it will be pretty noticablem because it will be cocked sideways. that is the air mix door gear, that changes position of doors and allows hot/cold air to come in. How id your heat knob on the dash moving?? is it free, or does it bind up, while you are turning it from cold to hot and back to cold?? check it.
Not sure if you still need an answer, but the air mix door is likely not opening and closing properly. This is attached to the temperature control knob on your dash and is what selects hot or cold air to enter the cabin. The cable connects just above the accelerator pedal and you should see a cable, attached to a black gear that turns a white gear. Sometimes the white gear becomes loose and falls out. Nissan Technical Service Bulletin on this. If you remove screw holding black gear and turn white gear it should change your temperature. The TSB is easy to have Nissan fix or you can likely perform.
check fuses and relays. there is an electric motor that opens and closes a "blend air door' that switches from hot to cold. the other lights may or may not be related. Is is very possible that the plug going into the control unit has a bad connection.
problem could be in the mode switch + check fuse to heater and ac mode switch.if blown your air door wont open and let heat enter inside car.if fuse look good you could have faulty mode switch.if you have climate control if you have a bad in vechicle sensor that will effect air door to open let heat in.this problem would be best for dealership.if dealing with climate control units.you need a quick fix.too cold outside not to have heat in car.
Make sure the heater hoses are HOT. If they are not real hot then the heater core can be clogged. At that point you can remove both hoses where they go into the firewall and blow compressed air through them or a high pressure water hose until it flows freely. It can also be whats called the blend door actuator. This is an electric motor under the dash that closes a door depending on weather you want heat or a/c. We have seen many times when something has fallen down in the defrost vents and is stuck in the blend door keeping it open partially which would cause a poor heat condition (pens,pencils,etc...) Lastly, if this is a manual a/c system meaning it has a knob for hot to cold-pull the knob off and using needle nose pliars turn the shaft sticking out of the head unit in the direction that would be heat. These knobs are known to round off and lead you to think it is turned all the way, but it's not due to the bad knob. I am confident that one of these is you problem because there just isn't too many components to the heater system and this is what we see on a daily basis. Hope it helps!
appears we have an Air lock scenario and you will need to perform a
the vehicle on level ground, when cold remove coolant filler cap,
start engine and leave to idle, turn heater on full and blower to
max. When engine reaches operating temperature watch and listen near
coolant filler, keep clear as gurgling and hopefully a boil over
should occur. Top up with very warm coolant and wait as it may do it
for heat inside vehicle if warm replace coolant cap but keep an eye
on temperature gauge as the ~Air lock may have moved on from heater
matrix/core so proceedure needs to be carried out again from COLD.
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