If there is any residual air in the system, that can definitely cause your vehicle to overheat. If you have checked the hoses and they get hot, then your next step would be to check the operation of your air mixture door. I've only been home about 10 minutes. Even my old '88 Dodge Caravan had a control valve in the hose that would prevent the coolant from reaching the core. If you did feel the correct hoses, and neither is hot, then there are a couple of things it could possibly be.
My recommendation, start by troubleshooting your thermostat. These hoses should get as hot as any other cooling hose under the hood. Open my book and learn there's a control valve and a main one. However, there is a bypass tube running across the front of the engine that would allow all the coolant to bypass the heater core if the core gets blocked. Get multiple quotes from junk yards and auto wreckers who compete for your business. There are a few things I would recommend before doing any major dis-assembly. You should have removed the radiator from the vehicle and flushed it thoroughly using a garden hose although you could do it on the vehicle if necessary.
Intake Door Motor Diagnosis Procedure 144, front Blower Motor Component Function Check 146, front Blower Motor Diagnosis Procedure 147, front Blower Motor Component Inspection 151. The air mixture motor is located behind the heated seat switches on the heater unit. There are a few things I would recommend before doing any major dis-assembly. If that doesn't seem to be the problem then flush your entire cooling system thoroughly. So the door is opening and closing I don't see how anything can get stuck in there considering i cant see the door itself moving. It would be strange if the blend door is not operating because engineers default is heat and defrost. Also, I don't see a shut-off valve in the system, so that theory may be a moot point.
Again to ensure this is not the case just makes sure your car is reaching operating temp in a normal amount of time. I might try to remove something so i know the door is functioning for sure, but does this look like i will be replacing my heater core? This type of thermostat utilizes a reverse-spring assembly which pushes the thermostat closed when coolant temperature falls below normal operating temperature making the thermostats neutral position open ; this design prevents overheating due to thermostat failure. Change the temperature from one extreme to the other and see if you can hear or feel the motor engaging. If you look down into the open cavity you should be able to see the air mixture door motor. Overheating can lead to thermostat failure by disfiguring the wax contained within the thermostat. It would be strange if the blend door is not operating because engineers default is heat and defrost.
This will ensure that your heater core is actually getting coolant and heating up. You may lose a few drops, but that's about it. One thing that I would recommend checking first is to make sure that there is absolutely no air in the cooling system. Change the temperature from one extreme to the other and see if you can hear or feel the motor engaging. The main purpose of the water control valve is to allow the engine to warm up faster from a cold start. Below you can browse the current inventory of used Nissan Pathfinder heater control valve and related components sold by leading salvage yards across the United States.
If it's blocked, this may just fix it. I'm so glade I found myself here. If it does change a little then maybe the air mixture door is blocked. My heater in my wife's car would not work and took it to the dealer. It would be strange if the blend door is not operating because engineers default is heat and defrost.
So when i press the recirculation button nothing happens, according to all the tests my climate control unit is malfunctioning. Good luck, this stuff can be a real pain! You're talking about the heater core hoses, right? These hoses may be a bit difficult to get to since they are behind the engine. Below you can browse the current inventory of used Nissan Pathfinder heater control valve and related components sold by leading salvage yards across the United States. Thanks everyone for your helpHmmmm, that doesn't sound right at all. A quick fix without heater water valve replacement was to remove the gear inside the valve assembly and turn the valve counter clockwise.
Sometimes an inoperable thermostat the second thermostat located on the rear of the engine or air in the cooling lines will prevent the heater core from getting warm. You may lose a few drops, but that's about it. Of coors light and half a bottle of jose i had my friend drive. You don't have to empty the cooling system either, as the hoses are at the top of the engine bay. My guess is that your problem was that you had very little heat or no heat at idle.
One thing that I would recommend checking first is to make sure that there is absolutely no air in the cooling system. My wife's is leaking, either there or at one of the crossover pipe gaskets. What I am going to do today is essentially try to get to the heater core, but I am going to try to do it so that i can still check to see if it heats up when i turn heat on and try to visually see the air mix door open and close. These hoses may be a bit difficult to get to since they are behind the engine. They said the radiator went bad and leaked into the transmission. It must be in new resalable condition.