Blend motors! grr

today i spent 3/4 hours getting to the drivers side temp blend motor, i was expecting the gears to be shredded (as i bought a wire blend from ebay for parts)

but no, the one in my car looks fine, the teeth are all fine, the motor works perfectly(tested with 4.5v) and the potentiometer hasnt blown either(multimeter).

but still it doesnt move!

i have manually put it to the hot position, (i was thinking, as its winter, better to be warm than cold!)

anyone have any clue what is going on here?

i feel like i have wasted a day!

Paul

I replaced a blend motor after a fault coming up but it still has not fixed the problem. I still get a 'distribution circuit fault'. What I now think is the problem is that the ECU is gone bad and is not getting the signal from the slider inside the motor.

Where is the ECU. Haven't these cars got a million Ecus to control everything.

The thing is that the dredded duct pipe thing had already been cut and brackets made to go back toghether nicely. That helped me alot. But I'm guessing the motors have been changed already.

Paul

paulham said:

Where is the ECU. Haven't these cars got a million Ecus to control everything.

The thing is that the dredded duct pipe thing had already been cut and brackets made to go back toghether nicely. That helped me alot. But I'm guessing the motors have been changed already.

Paul

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is it the blend motor or the air distribution motor you are on about.

the bottom one on the right. the one that controls the temp

ECU is in the HEVAC control panel, just replace it

In my case it was the distribution motor that went but each of the blend motors
have a sensor track in them to tell the ecu what position its at. My one still runs the motor through its paces on a calibration run but I can't force the motor to work using faultmate. This is what leads me to think the ecu is gone in my case.

paulham said:

the bottom one on the right. the one that controls the temp

Click to expand...

ok,was just making sure as some people get them confused.have you tried them on a rovacom or anything to reset them.

no? how? i have a scantool though. any programs i can download?

paulham said:

no? how? i have a scantool though. any programs i can download?

Click to expand...

i do not think scan tool is ok for the p38.if you know different please tell us.it is getting late now.if you are on line tomorrow have a word with a bloke on the forum called irishrover,he knows the ins and outs of p38's.

Scantool is worth SFA on the P38, will only do statutory engine management/emmissions on late models, no good for BECM, EAS, Hevac, EDC etc i.e. all the stuff that actually goes wrong.

You need faultmate, rovacom or Testbook to do anything worthwhile with RR.

Its best to use Testbook or similar with blend problems,use the fault codes to get an idea what is wrong,clear them then use "Force outputs" to make the ecu drive the blends through their range of movement.
The ecu's are not the best,I've had new ones that dont work out of the box. Look on www.rangerovers.net at the p38 section about blends and the sticky about my way of sorting the dist flap with a self tapper.

I think its my blend motor thats gone. one side blows out hot an one cold. but... if i leave it on hot and start the car a couple of times it changes to hot! An if i leave it on cold an start it a few times it goes cold. so i still kind of works.

Anyone heard of this before??