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Re: no heat hoses dont even get hot have great a/c
Check to see if the car has enough coolant and is there mist on the inside of the windows because if there is your heater core is gone but do the first thing first check the coolant level and let the car get to temp and keep putting antifreeze in until it gets to the hot mark and close the cap right away cause you may have an air bubble in the system
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1 check,Feel the heater hoses,do they get hot ,both or one?They should be hot,if not flush the heater core directly with a hose,back and forth at each hose connection.
2nd check,clamp off the top rad hose and force the hot water through the heater and check heat output.If there is heat with top rad hose clamped change the thermostat,it's either leaking or defective,new or not.
have 2002 altima,blower works no heat at idle and very little heat when accelerating.I changed carbon cabin filter,made sure little gear under dash to temp knob wasnt broken,flushed and bled system.Nothing worked so checked hoses to heater core and found inlet hose was hot,outlet hose was not.So investigated this problem and came to conclusion heater core was clogged.An easy way to check is to get car to normal running temp. put on heater and blowers at full.Go under dash on passenger side where counsel meets firewall,this is where heater core core inlet and outlet aluminum tubbing go through firewall,you will be able to feel both tubes one closest to you is outlet, so if this one is not hot and and other is your heater core is clogged.I detached both inlet and outlet hoses to heater core from water control valve.Then I blasted water with waterhose and nozzle set at jet,first through outlet hose to blow gunk out,then through inlet hose until water runs clear.Reatach hoses fill and bled system.heater works great nice and hot!
With blower on high and tempature to max heat check to see if you have good air flow in all mode selections (defrost, vent, floor etc.). If so and you still have no heat then check heater core hose going from engine to inside car to heater core with vehicle running and coolant tempature about half on guage. If both hoses are hot and coolant in radiator/overflow bottle is full then hot cold blend door is stuck in cold position. If coolant level is low you will get no heat, check coolant level first.
You have a "blend" door problem, this door moves back and forth inside the air cting between the hot heater core and the cold AC core, it either shuts one core off or blends the air between the tow cores to get the desired air temperature at the outlets set by the driver or passenger. To replace this defective door and its electronically controlled stepper motor requires the dash be removed from the car. This is a HUGE job. You must have great repair skills and a factory repair manual or access to one on line like at www.alldatadiy.com. The heater hoses and AC are lines should be hot and cold, that is normal.
Probably air locked. check to see if one of the hoses leading into heater is hot. Other cause could be heater solenoid control valve faulty.
Very unlikely that the heater matrix is blocked.
Easiest way to bleed heater is to remove hose's when car is cold and GENTLY flush through with garden hose and push hoses back on when full of water, so you know you have a heater full of fluid.
Hope this helps
i have the same problem and i change the termo and even the heater core and still no heat but there is a clicking noise coming from under the pass side dash im working on rite now so im hoping thats my problem engine get hot like it suppose to but no heat.........HELP
Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.
This is actualy strange because the heat and a/c are different systems. If someone came to me with this problem first I would ask did it happen at the same time ? Then I would check the Blower Motor & Blower Motor Restistor. Do you feel the air coming out of the dash ? can you still turn it up and down ? If not both a/c and heat are working you just need to replace the blower motor and blower motor resistor. always replace both at the same time each can make each go bad you dont want to put a new blower in there and have the old resistor ruin it in a day.