HEVAC

[banarcus]

Finally plunged in and ripped out my dash so that I can see what's going on with my HEVAC.

I plugged in my EAS Unlock V4 and my left blend door servo isn't moving. Not getting 12v or something.

I ripped out the blend servo. Opened it up and tested the motor inside. I could stall it with my fingers very easily. I had some left over motors from my disco 2 door lock project and used a spare to replace the dead servo motor.

After replacing the motor and lining up the arrows on the wheels, I powered up the HEVAC but it seems the little pot is erratic. I replaced it with one I bought from a company in Germany.

Now the bugger works but it appears to me that the pot that I bought is confusing the HEVAC unit. I'm going to have another play today to see if I can get it to work properly otherwise I'm going to replace the dud one or bite the bullet and buy a new set and be done with it!

Sent from my SM-N9005 using AULRO mobile app

[mtb_gary]

The blend flap should also move freely. A fairy common problem due to warpage and dirt ingress.

[p38arover]

Sorry but you can't place wanted ads in the main forum. You must use the Markets.

[TheTree]

I found the problem was old grease in the flap pivots, the flaps themselves are soft rubber and can't really warp

Cleanup by scraping off as much as you can and then Inox seems to have done the trick

Steve

[Keithy P38]

Don't forget to check the relays and fuses for these. Sometimes a dud relay will throw a code on the hevac when there's nothing wrong with the parts themselves.

Cheers
Keithy

[banarcus]

It's definitely a dud servo. The motor inside could be stalled by hand. I'm going to try and put back the original motor but with new brushes from one of my new motors.

I'll post up my progress.

Sent from my SM-N9005 using AULRO mobile app

[TheTree]

I replaced several motors before I finally took the dash out and did the airbox.

It seems the motors burn out from the extra load when the flaps get stiff

Steve

[banarcus]

I had a another look at the airbox. The flaps move quite easily but there was plenty of dirt/dust. I'll put that down to the crusty old filters I replaced late last year. They were bent all out of shape and obviously lost their filtering ability.

At the moment, I'm driving around without a dash until I source a second hand single servo or I'll bite that bullet and buy a set of new Britpart ones.

[banarcus]

Ok. I got scared off by the price of the replacement servos. One mob wanted an extra $28 on top of postage just to ship them to the Hunter Valley. If I were in Sydney I wouldn't have been charged that premium. Anyway...

The troublesome LH blend servo has been fixed. I cleaned up the original motor inside with emery paper. There was still plenty of meat on the brushes. I soldered the motor back in and then tuned the replacement pot that I soldered in.

For added durability, I greased up the servo gears and the rubber o ring that moves on the outer case.

The servo now operates as commanded via the HEVAC controls.

Now to do the other two while I have the dash off..

[banarcus]

Job done. No more error book. In fact, this is the first time I've had a error free HEVAC screen in 12 months.