My 2004 murano nissan has cool to warm air that comes out when you put on the heat? the engine does not run hot, in fact, the gauge almost reads a little on the cool side? I was thinking: maybe there is a clog or air pocket in the cooling system or heater core, so I began taking apart a duct or cover system above the radiator to look in the radiator cap and top hose, but I discovered a coolant leak at the top of the radiator when I did that? I did look in the radiator cap only, and it seemed full of green coolant? the overflow tank has green coolant too? I summized the rad leak must be minor? cause has coolant? thought to myself: i wonder if the system has a air pocket because the radiator pressure must be comprimised because the minor leak? Any ideas what might be wrong with the heater? I obviously need a new radiator, but wondered about suggestions about the heat? thanks.
SOURCE: 96 ford crown vic over heating
it seems you have to seperate issues here. fiirst let's start withtthe over heating. you stated that you have replaced the pump,thermosta,fan,clutch,all the hoses, and core. now my question to you is did you route the belt so it's circulating like it should? is it steaming out from under the hood? to be quite honest the vehicle should not even be close to overheating after driving only 3 miles. there is a possibilty that you have a bad sending unit for the temp if it is not steaming out from under the hood. your upper radiator hose is hot this tells you that the thermostat is operating as it should. the fan should be turning clock wise as you are looking at it from the front of the vehicle.when you fill the system with coolant make sure that you have the heater on high and to the hot setting. check to make open sure you have plenty of coolant and that the radiator is free of dirt and bugs.. now as far as not having anyheat in the vehicle check the fuse for your climate control. look under the dash and make sure you hooked all the cables for your fresh air door and blend door. when you changed the core did you connect the hoses in the right place?after you have checked all the hoses and the coolant is as full as can be and the heat is turned on to max ,keep the radiator cap off and start the vehicle wait for it to get hot check the upper radiator hose to see when the thermo stat opens you should see that the coolant should go down in the radaitor. do these things and check back with me on the results...please rate this help...thanks
SOURCE: 2002 V.W. Jetta 2.0 liter overheat
turn your heater on to max heat and high fan. then see if you can feel the hoses on the firewall for heat they should be hot. make sure that the fan unit on the radiatoris working if the upper radiator hose is hot the fans should be running if they are not that means that either the relay is bad the thermo sensor is bad or the fan unit is shot... please rate the solution..........thanks
SOURCE: No heat. Temp gauge barely moves, but hoses to/from core are hot
Did you run engine from cold, with heater (not defrost) on , rad cap off & wait for rad fan to come on 2 or 3 times before you put rad cap back on? Rev engine slightly and hold it there for 30sec. to 1 min. every once in a while while doing this to aid in increasing flow & remove air locks. If both hoses in & out are hot to touch, then you should be getting heat, and I would start looking at blend/air door etc on heater to make sure it's going to it's proper position.
SOURCE: 04 civic heater blows cold air at idle
you should have hot water on all rad. hoses when the motor is running at a norm. temp. the water is not going through the heater core like it should. you have cutoff valve bad low water are a stopped heater.try a hoter thermostat if none of the above are true.
SOURCE: The heat in my 1992 Jeep Wangler is not working.
The only reason it won't blow hot air is because the water is not getting to the heater core. Check to see if you have a heater control valve in one of the two lines to the heater core. If so check to be sure that is is opening and closing. If it won't open then you get no water flow in to the heater core.
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