Question about 1997 Mercury Mountaineer
Take the heater core hoses off at the firewall and add cleaner/flush directly to the core. Run water through and get the gunk out. Ford has a WYE piping system that will bypass the heater core and not allow it to FLUSH and it will get plugged.
The other thing to check is the BLEND DOOR and it is operated by a little motor which you can observe if you have the panel where the radio/heater controls are off. It swings from heat side to a/c side (and in between)as the colors on the knob are rotated. Watch the operation and hope the door has not come off inside the box or the cable.
Posted on Oct 24, 2010
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Posted on Jan 02, 2017
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