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HVAC blend control motor

Tiny
RJK5963
  • MEMBER
  • FORD F-350
97 Ford E350 Club Wagon w/dual ac. 111K miles 5.4L
The front vents all work, when ac or max ac is selected the front blows warm air only. Not hot not cold no matter the temperature selected. The rear blows cold like it should when turned on. Max AC windows doors open the compressor runs continuous. I suspect that the blend door motor is malfunctioning, although I can see it move when the temp is changed. Is there any way to diagnose this further?
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Thursday, March 23rd, 2006 AT 10:56 PM

2 Replies

Tiny
PEPPERMRJ
  • MECHANIC
  • 1,158 POSTS
Check the heater control valve also.

Good luck and let us know. :)
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Saturday, March 25th, 2006 AT 9:56 PM
Tiny
RJK5963
  • MEMBER
  • 2 POSTS
97 Ford E350 Club Wagon w/dual ac. 111K miles 5.4L
I found the problem. Pulled the blend control motor and the door fell into the position that blocked air circulating though the heater core; cold air at the vents. The blend door shaft that receives the drive shaft from the control motor was split. So the motor would move but not move the door.
I have found that these systems no longer have a heater control-valve. Hot water circulates in the core all the time. Almost $250 in parts and some foul language the repair is done. It's a van and access is not the best.
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Monday, March 27th, 2006 AT 12:39 PM

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