Heater Vent Control
Posted 09 March 2010 - 07:04 PM
Posted 04 November 2017 - 06:57 AM
Blend Door Cable or Door is also referred to as Temperature Control Cable or Door.
Lack of Heat, The Cable Controlled Temperature Blend Door's Cam Spring Does Not Allow Blend Door to Seat Properly.
NOTE: The temperature door can be set to full cool, full warm or anywhere in between. The function control knob does not affect the temperature blend door; this is governed by the temperature control knob.
Blend Door Location in a 94; 80-96 similar; "...Probably the temp blend door is loose & flopping around on its own. The easiest way to see it is to fully lower the glove box, pull the ~8 screws from the heater core cover, & look inside to the L (driver's side). You'll see the cable & control lever (in top L of 2nd pic) as soon as you fold the glovebox down, so inspect it first. The 3rd shows the whole cover - it's the large section in the top center with tiny white numbers inked near its bottom edge. The cables are visible, too...."
See these for more diagrams;
The temperature control knob may be difficult to turn on some vehicles.
There may also be a low or no heat/cooling condition accompanied by poor temperature modulation. This may be caused by the single cable temperature door operating system being used. But your 96 Should have the new dual cable.
Blend Door Control Cable Location pic for 92-96 Bronco & F Series
On 87-96 trucks, it's easy to fold the glove box down & pop it off its hinges or move it back into position.
Blend Door Control Cable pic in a 92
Source: by 2bet
In the FLOOR position, the OUTSIDE AIR door is open. Airflow is directed through the TEMPERATURE BLEND door opening, through the heater core (18476), past the closed FLOOR/PANEL door and out through the open FLOOR/DEFROST door to the heater outlet floor duct (18C433). There is also an air bleed past the closed FLOOR/DEFROST door to the windshield defroster openings. Read more @ http://www.diesel-da...tj/stjc2007.htm
Here is the 96 F Series/ Bronco Workshop Manual, partial by diesldave @ http://www.diesel-da...stj/stjleft.htm
But this section doesn't address the Blend Door Cable or Door, also referred to as Temperature Control Cable or Doorbecause Ford didn't want to get past routine issues.
- Insufficient, Erratic, or No Heat
- Low radiator coolant due to coolant leaks.
- CHECK radiator cap pressure. REPLACE if below minimum pressure. FILL to specified coolant level. PRESSURE TEST for engine cooling system and heating system leaks. SERVICE as required.
- Engine overheating.
- REMOVE bugs, leaves, etc. from radiator and support or A/C condenser core fins. CHECK for:
- Operation of engine fan clutch
- Loose drive belt
- Sticking thermostat
- Incorrect ignition timing
- Water pump impeller damage
- Restricted cooling system
- SERVICE as required.
- Loose drive belt.
- REPLACE drive belt if cracked or worn and ADJUST drive belt tension.
- FEEL heater water hoses. If the heater water hoses are too hot to hold, the thermostat is OK. If the heater water hoses do not get too hot to hold, REPLACE the thermostat. If only one heater water hose gets hot while the other remains cool, a plugged heater water hose or heater core is indicated.
- Heater water hoses.
- CHECK condition and routing of hoses. GO to Pinpoint Test A.
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See my Big Bronco & F Series Technical & Parts LINKS site. Will need to clean up dead links & add many more new links some day. Thanks to Mr. Schwim! http://schwimserver5.com/?index=1128
Thanks to All Who Serve
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