Not sure whether this is a common fault, a design feature or what but my 156 has a buzzing noise that appears to be coming from behind the temp controls unit. I think i have a problem with the driver side temp dial too as it's unresponsive to change. Would this cause the buzzing noise or could it be something else? The noise can only be heard when ignition is on or when engine is started. Any advice appreciated.
Sorted. 2 problems fixed. The buzzing sound was coming from a dirty motor and impeller fan that looks like it drags in air to measure ambient temp. Cleaned with a small brush to clear the blades of dust and then hit it with carb clean. Lots of black came out and now it's silent.
The climate control drivers side was knacked. I found that on opening the unit a small chip had worked its way from the pcb. I carefully soldered this back to the board and hey presto, I now have dual climate control!
1) remove cigarette tray (2 x screws inside at top)
2) Remove gearstick gator and silver plastic surround which just pops up
3) undo 2 x screws inside gears tick area at back towards handbrake and remove the trim
4) remove stereo I used 2 x Allen keys as my propper removal tools were too thick to get into the holes.
5) unscrew 4 screws at bottom of stereo enclosure - 2 are angled 2 are straight.
6) I think there are a further set of screws underneath the heater controls to remove
7) remove the heater controls
8) the smallest of 3 plugs that connects to the back of the unit is black and goes into a cylindrical housing. This contains the impeller and motor. Disconnect the plug and twist the housing slightly anti clockwise and pull. It should just pop out.
9) I cleaned mine with a really good spray of carb cleaner - lots of black crap buildup came out.
10) replace in reverse order
Not sure if this is completely acurate from memory but its fairly easy going to do. Shouldn't take much more than 40 mins.