Detail: I have a 2005 nissan pathfinder. I have only had it 2 months and just now starting to use the heat.when you have it on hi it only blows cool air but when its off or on low warm air comes out. the controls are hard to figure out so im i doing something wrong or is something wrong with the heater?
Solution: Heater matrix blocked , Check the water level in the radiator, not the reservoir, the radiator itself, or the press down and turn cap that may be on to of the thermostat housing. Low coolant can cause water not to cycle through the heater core. , Hi, a 6ya Mechanic can help you resolve that issue over the phone in a minute or two. Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need. Goodluck! , I live in Alaska and have had the same problem i just added more coolent to the radiator and it warmed up i installed a block heater and i leaked a bit and the coolent level got low and i would have no heat. I tryed to fill just the coolent resivoir and that dident work so i filled the radiator pumb full and that worked!! Hope this helps. , replace heater control switches , Hi! It appears we have an Air lock scenario and you will need to perform a system Bleed. Park 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 again. Check 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. Please press the Blue button to appraise my FREE Efforts, Thank You! Paul 'W' U.K , Yes, your Nissan Pathfinder has a heater pump. The heater pump circulates the hot coolant from your engine to your heater core(s). You have two heater cores if you have rear temperature controls. My guess is that your problem was that you had very little heat or no heat at idle. Attached is the page from the service manual on how to replace it. , Had similar problem. The actuator that opens & closes the air blend door quit working. This is easy to see if you remove glove box. The actuator will move when you adjust the temp selector (do this while the heater is running).