4.0 heater stopped working

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Dec 30, 2004 | 06:36 PM

i drive a truck

Thread Starter

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Joined: Dec 2004

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4.0 heater stopped working

Like the title says my 97 4.0 heater just stopped working. i have checked the thermostat and also the ecu for any codes that it might be putting out. any help on what it could possibly be is appreciated thanks

-IDT

Dec 31, 2004 | 12:01 PM

Rockledge

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Joined: Jan 2003

Posts: 9,748

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From: Connecticut

Welcome to FTE!

Need some more info. For example, it could be a heater core issue - did you check the heater hoses that run to the fire wall (the ones that go to the heater core) to make sure they both are hot? Is the the blower motor (fan) working OK? When you switch modes (floor, defrost, etc.) does the air come out of the proper vent openings? If yes to all of the above, then you probably have a blend door problem. If the blend door is busted, a "workaround" can be found here:

https://www.ford-trucks.com/forums/s...threadid=24962

A blend door repair (replacing the plenum) can be found here:

https://www.ford-trucks.com/forums/s...hreadid=152937

Jan 3, 2005 | 07:37 AM

FX4_FAN

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Joined: Feb 2004

Posts: 62

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From: Mi

I just ran into this same problem on my 98 4.0 explorer. The heat will work when you first start the truck but if you turn the heat off while your driving the heat will not come back. The fan works and the air comes out the right vents, it's just cool instead of hot. The temp gauge reads normal so I'm not sure.