Blend door actuator issue

[neilyp]

Hi there,

My Mark 7 transit is continuously blowing hot (cold only at startup) I have replaced the blend door actuator but now when i turn the dial from cold to hot or vice versa the motor doesn’t appear to move at all.

I’m not too sure what the next stage is - i was thinking of testing the plug going into the actuator but i’m not sure what the expected values should be. I have checked the air con fuses and these all seem okay.

Any help would be appreciated

[andz327]

Does the actuator work when it's off the heater ? Is it new? Are the spring, arm and rod on properly

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[andz327]

Does the actuator work when it's off the heater ? Is it new? Are the spring, arm and rod on properly

Sent from my SM-G990B using Tapatalk

Check for blown fuse as faulty unit may have blew it, don't know what one but easy enough to check both interior fuse boxes behind glove box

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[neilyp]

Does the actuator work when it's off the heater ? Is it new? Are the spring, arm and rod on properly

Sent from my SM-G990B using Tapatalk

I haven’t tried it off the heater but i will do that next and check.
The rod is one correctly i think - can’t see it going on any other way

[neilyp]

Does the actuator work when it's off the heater ? Is it new? Are the spring, arm and rod on properly

Sent from my SM-G990B using Tapatalk

Check for blown fuse as faulty unit may have blew it, don't know what one but easy enough to check both interior fuse boxes behind glove box

Sent from my SM-G990B using Tapatalk

Yes it’s a new actuator - spring is in the right position, the spring auto closes
the flap it seems. I am guessing that’s right

[andz327]

Yeah but think the arm it goes on can be fitted wrong way

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[neilyp]

Does the actuator work when it's off the heater ? Is it new? Are the spring, arm and rod on properly

Sent from my SM-G990B using Tapatalk

Check for blown fuse as faulty unit may have blew it, don't know what one but easy enough to check both interior fuse boxes behind glove box

Sent from my SM-G990B using Tapatalk

Yes it’s a new actuator - spring is in the right position, the spring auto closes
the flap it seems. I am guessing that’s right

Will double check the fuses tonight and see if the motor operates when away from the heater

[neilyp]

Yeah but think the arm it goes on can be fitted wrong way

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I put the arm on the same way it came off - it would fit any other way as far as can see

[neilyp]

I have now tested the supply to the motor (should have done this first) and there is no power at any of the terminals.
I have checked and all ac fuses are fine as well.

What is the operating process? I’m not sure where to check for power next.

Any suggestion's?

[andz327]

Have you tried the relay , if I remember correctly there's one that you can swap over to try but not sure if that has anything to do with the blend door activation, think you'd need to try get wiring diagram and start tracing wires back, there's a vacuum hose that comes through the bulkhead and sometimes are perished and flat....again I don't know if this problem would cause yours , are all the little micro switches behind dashboard connected

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[Frag]

Check F39
2nd from left,top row,left corner,in the first fuse box you come to behind glovebox.