Gjør det selv: Skift kupevifte på BMW 3-serie E90 E91 E92 E93

BStein · Oktober 19, 2011

Har nettopp skiftet kupevifte på min E91. Den var dårlig og støyet mye, spesielt på kalde dager. Vanlig feil på 3-serien, forstår jeg. Da jeg syntes informasjonen ikke var særskilt lett tilgjengelig, så tenkte jeg at jeg skulle legge opp guiden jeg fulgte her (engelsk). Bra guide!

(Punkt 5 gjelder dersom du kun bytter viftemotor og skal beholde selve vifta. Jeg kjøpte komplett kupevifte på mekonomen og hoppet elegant over punkt 5).

Tools needed:
Flashlight

Drop light

T-20 Torx screw driver

Mechanics Dental Pick.

Basic procedure:

1) Remove the passenger side lower dash panel.

2) Disconnect the power connector to the blower.

3) Remove the right-side heater duct work.

4) Remove the blower unit.

5) Swap the motor controller electronics from the old to the new unit.

6) Re-install the new blower unit.

7) Re-install the heater duct work

8) Re-install the lower dash panel.

Instructions:

1) Remove the Passenger side lower dash panel:

a. Slide passenger seat all the way rearward

b. Look under the glove box door and you will see two, black, torx (T-20) screws. Remove them.

c. Pull the lower dash panel down and rearwards and pull it halfway out.

d. Disconnect the power lead to the footwell light.

e. Remove the panel.

2) Disconnect the power connector: On the blower unit you will see a white plastic electric motor controller unit that has two connectors. One connector is for power from the body to the controller, the other connector is from the controller to the blower motor. Disconnect only the connector that feeds into the body cable. It disconnects by squeezing the black tabs and pulling straight down.

3) Remove the right-side duct work: The duct sits right behind the hinge for the glove box door and ha three feed holes. At the end of the duct (third feed hole) near the center of the footwell, gently pull the duct straight down about an inch (it snaps onto part of the blower housing with a metal toothed clip – it comes off easily). Now, pull the duct piece straight out from the center console towards the right side of the footwell. It will snap out of place. A second, smaller duct piece will probably come with it. This piece feeds the air into the rear seat duct work. It snaps on to the larger main, front footwell duct.

4) Remove The Blower unit: (This is where the Bentley procedure goes awry). The blower unit just twists in and out of place. There are two tabs on the perimeter of the blower unit housing. One tab is in the front near the white part number label. The front tab is an indexing tab to make a stop for the blower unit when twisting it into place. The second tab is in the rear of the blower near the fire wall and is hidden above the big, inch-thick, wire harness running along the firewall. The second tab is a locking tab meant to keep the blower from rotating out if it’s hole once it is in place. It’s hard to see the locking tab and hard get a hand on it. You will most likely break the rear tab off while removing the blower and replacement unit will probably not have the tab on the housing (because it was broken off already if it is a refurbed blower unit.

a. Once the duct is removed, find the rear locking tab and pull it down using the dental pick.

b. While the locking tab is pulled down twist the blower unit counter-clockwise (as you are looking up at it when on your back under the foot well).

5) Swap out the Motor Controller:

a. The motor controller is white and mounted to the blower unit housing. On the old blower unit, disconnect the second connector that feeds power to the blower motor. Remove the two silver screws (T-20 Torx) that mount the controller to the housing.

b. Install the old controller on to the new blower unit using the screws. Reconnect the connector.

6) Re-install the new blower unit:

a. Put the new unit up into the big opening in the HVAC housing. Rotate the blower unit clockwise until it locks in place with a click.

b. Reconnect the power connector from the main body harness.

7) Re-install the heater duct work:

a. Put the large ductwork piece back in first until it snaps into place.

b. If the small duct came out when taking the duct apart, re-install it now. You’ll have to move a wire harness that runs along the transmission tunnel and pull a part of the console trim out a little bit to get the little duct back into place.

8) Re-install the lower dash panel:

a. There is a large clip molded into the dash panel that slides into a slot on the lower dash, so make sure you get the clip into the slot.

b. Now re-connect the footwell light connector and push the panel back towards the firewall.

c. Rotate the front of the panel upwards to align the screw holes and re-install the screws that hold the panel in place.