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It may be a broken blend door. Typically to fix this problem, a mechanic will disassemble the entire dash, and replace the plenum box. Unfortunately this is an expensive fix because it is labor and parts intensive. There is a DIY solution called heatertreater. They provide instructions on how to access the blend door by removing the glove box, and replacing the blend door without removing the dash and plenum assembly. Broken blend doors are a common problem among Ford explorers, and most heating and A/C issues in late model Ford explorers are directly caused by a malfunctioning blend door.
Read more: 2004_ford_explorer_heater_problems_clikcing_noise
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Your heater will not blow on your 1996 Ford Contour?
heater will not blow on a 1996 ford contour
1998 ford f 150 front heater does not blow cold or hot air but the rear still works fine?
Your problem sounds like the common blend door problem on the Ford Expeditions, and Ford Explorer. Check related link below
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Plugged heater core. Try flushing it.
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The blower on the back heater may need to be replaced on the 2000 Ford Winstar.
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A broken blower fan. Had that on my Ford Explorer. Not a big deal to have a mechanic fix it, under $200
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Blocked heater core, faulty heater valve, disconnected connection to the heater valve.
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Assuming you want it to blow hot, it could be low on coolant, a stuck open thermostat, a plugged heater core or a faulty temp blend door.
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Why does a 1997 ford explorer Eddie Bauer heater fan sometimes blow hot air and sometimes only cold air?
if its winter first check coolant lenvel and check coolant system for leaks. then check thermostat
Why when idling does your Ford Contour 1997 heater not blow heat but when moving it does?
I own a 1997 Ford Contour and there was a recall a few years ago on the heater blower and resistor. Check out the recalls on the car.
