Blend Motors Not Blending!!

Typical, first sign of single digit temps and the blend motors throw a hissy fit!!

Can someone enlighten me on exactly what is happening in the bowels of the dashboard under the following conditions.

Driving along on low both sides most of summer no problem. As colder temps have come along moving up to high has had no effect on drivers side (passenger side fine). I could drive to the moon and back with it set to high and it will chuck out cold air. But if you leave it on high and turn the engine off, when you restart it will shoot up to high and burn your butt off. If you then adjust back to cold it will go down no problem but will not increase until you go through the stop start routine again.

Is this some kind of calibration going on when you start up or is it just that blend motor heading south, or the actual hevac unit starting to play up.

Many thanks.

Yep, during start up, the motors can cycle themselves, if at the extremes of travel they stick, they will fault and stay there....do you have the Book symbol onm the display??

Saint.V8 said:

Yep, during start up, the motors can cycle themselves, if at the extremes of travel they stick, they will fault and stay there....do you have the Book symbol onm the display??

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Symbol comes on as soon as you try to take the temp up.

Extremes of travel I can understand. But after the stop start routine and the sauna becomes too much on high, you can take it down to 22 degrees fine and it will stop there, but as soon as you go back up to say 25 degrees book symbol comes on and it won't budge off 22 although it's showing 25 or whatever.

fortgrange said:

Symbol comes on as soon as you try to take the temp up.

Extremes of travel I can understand. But after the stop start routine and the sauna becomes too much on high, you can take it down to 22 degrees fine and it will stop there, but as soon as you go back up to say 25 degrees book symbol comes on and it won't budge off 22 although it's showing 25 or whatever.

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Sounds like the flap is sticking, is this the fault that eightinavee's self tapping screw fixes?

Datatek said:

Sounds like the flap is sticking, is this the fault that eightinavee's self tapping screw fixes?

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This is a blend flap malfunction Keith. The self tapper is for the distribution flaps. That motor drives two full width flaps via the distribution quadrant. The front flap very rarely tightens but the quadrant pivot and the back flap do. The blends are two separate flaps one for each side and are much easier to drive. They very rarely if ever stick. Sounds more to me like one side of the pot is duff or the solder joint has broken away.

wammers said:

This is a blend flap malfunction Keith. The self tapper is for the distribution flaps. That motor drives two full width flaps via the distribution quadrant. The front flap very rarely tightens but the quadrant pivot and the back flap do. The blends are two separate flaps one for each side and are much easier to drive. They very rarely if ever stick. Sounds more to me like one side of the pot is duff or the solder joint has broken away.

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Fair enough, never had the pleasure of failed blend motors yet

Datatek said:

Fair enough, never had the pleasure of failed blend motors yet

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Your time will come - hope not for a long while though

So reading between the lines the blend motors have to be replaced again!! This will be the 3rd set on this motor. The ones that it left the factory with, they were changed again at 35000 miles and I've just ticked over 64000 and they need sorting again.

Land Rover (or whoever makes these blend motors) build quality shines through again.

Put it on diagnostics first it will give an indication of where the problem lies

fortgrange said:

So reading between the lines the blend motors have to be replaced again!! This will be the 3rd set on this motor. The ones that it left the factory with, they were changed again at 35000 miles and I've just ticked over 64000 and they need sorting again.

Land Rover (or whoever makes these blend motors) build quality shines through again.

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Valeo, and the same parts seem to be used in other cars.

Datatek said:

Valeo, and the same parts seem to be used in other cars.

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Some says there a two qualities: Range Rover P38 Maintenance repair improvements and tips learned by experience by ownership.

Druim said:

Some says there a two qualities: Range Rover P38 Maintenance repair improvements and tips learned by experience by ownership.

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If there are, then for sure LR would have used the low quality versions.

Datatek said:

If there are, then for sure LR would have used the low quality versions.

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Yep, what the Swede says