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i`m guessing the blower motor is working.check coolant level then run car until hot,that is the upper rad hose is hot to the touch.then touch the heater hoses they should feel the same in temp from one to the other.if not then the heater core is plugged and will have to be flushed.you can clamp the hoses with something so you won`t loose very much coolant.then remove the hoses and using a garden hose run water one way then the other way.if this doesn`t work you can try and drain the heater core and fill it with clr and let it sit for a while(about 30 to 45 minutes)then flush the heater out with water.then hook up the heater hoses and run until hot,if it works then you will have heat and unplugged the heater.if both hoses are the same temp then replace the thermostat.
check the coolant level in the rad,then check both heater hoses when the truck is warmed up they should be the same temperature if not then the heater core is plugged.you can try running/soaking the heater core with CLR to try to unplug it.if it doesn`t work then it will have to be replaced.also the thermostat may need replacing.
Hi, you probably have air in the system. Park on an incline, turn the heater on, open the radiator cap, start the engine, and let it run until the thermostat opens. Keep the radiator full and when the level stops gong down your heater should be working again.
check coolant level first. possible bad thermostat, blockage, heater core is bad. check to see if a hose going into heater core is hot, if the hose is hot and the other is cold you have a blockage in heater core. if so, sometimes you can remove the hose from heater core and flush it out with a garden hose. if above fails, flush whole system.
Here are a few suggestions for things to check. Make sure your coolant (antifreeze) is full. Perhaps there is an air bubble trapped on one of the hoses that is preventing hot water from circulating to the heater core. Make sure the thermostat was mounted in the correct direction. Check the heater hoses for crimps that may be restricting water flow to the heater core. You can try removing both of the heater hoses going into the firewall and flushing water through the heater core just to make sure it's not blocked. If you bought this car used and the heater has never worked correctly check to see if the heater core has been bypasses with a hose. This is sometimes done to fix a leaking heater core. It fixes the leak but your heater won't work correctly afterward. Perhaps one of the louvers inside your dashboard is not moving to the correct position to allow airflow over the heater core. The louvers are controlled by electric actuator motors. The problem may also be your DCCV (dual climate control valve). I hope at least one of these suggestions helps you out.
Check to make sure your blend door is functioning properly inside the dash(the door that directs air onto the heater core) If your heater core isn't plugged and thermostat and the rest of your cooling system is working properly then this would be the next thing to check. Sometimes you can hear it moving when you move your temp control if not then you will physically have tp check it. Good luck.