Annoying Blend Motor Problem

Jamiehol · Dec 17, 2012

Following on from replacing all 3 blend motors, and the book symbol returning within a month. I was getting a fault for the right hand temperature blend motor stalling.

At the weekend I stripped it down to make sure then flap in the heater box is free, and that is all fine.

However on checking the faults now I am just getting a fault for the feedback circuit on the same blend motor having failed, so I dismantled the Blend motor and using then live data reading on my fault mate I can only get the pot on the board to sweep from 60 to 120%.

I assume that the pot has failed somehow, but does anyone know the resistance range the pot should sweep through ?

forthbridge · Dec 17, 2012

Ranger rovers.net has some good information, also theres a webpage from a guy in sweden ( I think) whos' replaced the innards of the blend motors - I'll have a look and get back to you , but should come up on a search for blend motors on your browser.

forthbridge · Dec 17, 2012

Range Rover P38 Maintenance repair improvements and tips learned by experience by ownership.
Here it is hopefully it'll help

NikTheGeek · Dec 17, 2012

forthbridge said:
Range Rover P38 Maintenance repair improvements and tips learned by experience by ownership.
Here it is hopefully it'll help

Some interesting articles on that site!

Jamiehol · Dec 17, 2012

Thanks for that time to break out the multi meter I think.

Jamiehol · Dec 21, 2012

So after faffing about I just decided to order a new single blend motor, and guess what still got exactly the same problem.

Have had the Faultmate on and it still reports the blend motor being stuck at 104%

Any suggestions as to what to try next.

Saint.V8 · Dec 21, 2012

Are you sure the flap is 100% free movement?

I read on here about a 'Self Taper Screw' repair...maybe a search will result in something...apparently this trick stops the flap from sticking!

eightinavee · Dec 21, 2012

Saint.V8 said:
Are you sure the flap is 100% free movement?

I read on here about a 'Self Taper Screw' repair...maybe a search will result in something...apparently this trick stops the flap from sticking!

Glad to see peeps are still using my trick many years on.....

Saint.V8 · Dec 21, 2012

eightinavee said:
Glad to see peeps are still using my trick many years on.....

There we go....the man himself.....maybe he can point you in the right direction!

Jamiehol · Dec 21, 2012

I can flick the flap from stop to stop very easily when the blend motor is not attached so don't think there is a physical problem with the flap.

Short of getting a spring balance on the flap then don't know how else to gauge if the flap is sticking.

JohnP38 · Dec 22, 2012

Possibly a connector issue or a Hevac controller failure

Jamiehol · Dec 22, 2012

Yes it is looking that way, noticed on a long journey today the frost warning seems to be behaving oddly as well

Annoying Blend Motor Problem

Jamiehol

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forthbridge

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forthbridge

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NikTheGeek

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Jamiehol

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Jamiehol

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Saint.V8

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eightinavee

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Saint.V8

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Jamiehol

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JohnP38

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Jamiehol

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