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Re: car heating is broke
The heater switch on the dash activates a valve allowing hot water into the heat exchanger under the dash. I think the valve is not opening so the heat exchanger stays cold. The linkage could be faulty or the switch could be faulty.
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It could be your heating coil. It seems that your fan is running (at least to the outside vents). Since your temp. is fine there is probable not a problem with your coolant. As far as it not blowing through the vents in the middle couldn't tell you.
sounds to me like you have a thermostat that stuck open ,I recommend pulling the thermostat and inspect it for sticking open .you have got to have a engine that up to normal operating temp to get good heater performance
Your heater core could be blocked. Check the hoses going to it on the inside of the engine compartment. There will be 2 5/8' heater hoses going into firewall adjacent to one another. The tempature of these hoses should be almost the same after your van has reached normal operating tempature and your temp select switch is on hot(heat). If not it's a good idication your heater core may have some blockage in it. You would then have to flush it out or replace it. Hope that helps.
will the air flow switch from floor to the mid to defrost? if so then we have a problem with the tempature door actuator. easy to replace just in tight place. Keep me posted for more help or if this was any help thanks
My 2005 Nissan Sentra 1.8s with 55,000 mi. blows cold air from the heater. Coolant not circulating in engine. Lower hose stays cool to touch. Both heater hoses cold. Changed thermostat - didn't fix it. Coolant not leaking or dirty. None in oil - no oil in radiator. Changed worn water pump belt - pump spins freely with no noise or resistance. Cooling fans come on after warm-up. Temperature gauge stays in normal range then jumps to hot and back again. Coolant good to 10 below - didn't freeze here yet. No other problems or repairs to car. Afraid to drive and make worse. Help!
the temp is controlled by a blend door near the heater core and A/C evaporator core deep inside the dash, the blend door has an electric motor called a stepper motor, it has failed, so whenever the door was when it failed is where it will stay, in your case cold air position, to change this part the dashassembly must be removed.