A simple guide on how to change a heater control unit yourself
Estimated time: 1 hour Difficulty: Easy/Medium
Begin by disconnecting the battery at the negative terminal to avoid any damage to the electrical parts of the vehicle. You should always do this when changing any electrical parts.
For this job you do not need to remove all the plastic around this area of the dash, only a selected few parts. Begin by prying off the cover over this part. Do this gently with a screwdriver, going round the edge of the piece, unclipping each part until it is removed.
There will be four screws holding the heater control unit to the dashboard, remove these screws first. They will most likely be Philips screws, so you will need a Philips screwdriver for this.
In most vehicles you will find a piece for storing items below the heater control unit, unscrew this. It could be Philips screws or may be Alan key screws, check which it is and use the appropriate tool to remove them. When these screws have been removed you can take this part out, giving you access to remove the control unit.
You will need to push it back from the housing, pull it down and then out. Disconnect all electrical connections at the rear to completely remove the old unit. Remember where you took each connection from, so that you know exactly where to put them on the new control unit.
Fitting a heater control unit
Take your new unit and re-connect each of the connections at the back.
Once this is done, slide the new unit into place and sit it in place.
Put the storage piece back in and screw it back in place.
Now screw the control unit in place, ensuring all screws are fitted tightly.
Re-click the plastic cover in place and re-connect the negative terminal on the battery. Turn on the ignition and test each of the dials on the control unit to make sure everything is working as it should. Installation complete.