Lately my van’s heat is not as strong as it once was. The blower (fan) works fine...but I feel heat when my car is moving but when I come to a stoplight I can feel it quickly cool down…then once I’m moving again the heat is back.
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there is usually a fuse for this should be in the line up front somewhere as an accessory item and should be at least a 15 amp..you can check the blower separetly and see if it works..ooppss..check the heater hoses for shut off water valves.. there are 2 , one on each hose(usually under the hood) open these up and the heat should transfer..
Feel your heater hoses. If both are hot, the core is circulating. If only one is hot-poor or no circulation of the core. If the heater core is circulating, the temperature blend door may not be working to let blower air pass across the heater core, and into the vents. If vacuum operated, watch the vacuum valves as you move heater controls-you may spot the problem. Check that the vacuum line from the engine to the control switch is working and still connected. If not operated by vacuum, the controls may have cables to the heater case or may be electrically operated. You'll just have to scope it out. Good luck.
Probably one of two things. First make sure that your coolant level is full. If the coolant is not flowing properly you won't get heat. If you begin to get heat while driving, but only when you are excelerating, this is your problem. If that is not it you may need to change the thermostat. This is noot hard as long as it is easy to get to and it should be easy.