davidwort 0 Posted January 17, 2011 following on from the chinese mk2 heater controls thread I thought I'd put up a few shots of the main unit that houses the control flaps and heater matrix and a bit of a description of how it works and what causes problems. This is the main unit viewed from below showing the cold and hot air flow routes. There are two flaps mounted vertically in the unit, the one with two cogs (as seen from below the unit) controls the path of air from the fan and directs the air through the matrix when heat is required. The other flap (with 3 cogs) shuts off the airflow to the dash face vents and airflow will then be directed to screen or feet. climatronic wiring-Golf from May 01.pdfhot-cold-flow.jpg[/attachment:28ub2fpi] more detail of bowden cables fixing points, gears and flap positions: 2.8l 24v Climatronic system.pdfP1010773.jpg[/attachment:28ub2fpi] view from front showing movement of hot/cold flap and face vent flap, current positions direct cold air to face P1010751.jpg[/attachment:28ub2fpi] inside here gets very dirty as the Corrado has no filter element to prevent dirt, dust, bits of leaves etc. from entering the system. A good clean up and a liberal spray with dry PTFE spray frees everything up. whole unit as viewed when fitted in car, outlet to face vents facing, fan attaches below unit to extreme left screen/feet outlets to right hand side All of the images I took, some 35 from different angles, with some captions and desriptions are here: photobucket Quote Share this post Link to post Share on other sites
Whitedog 0 Posted January 18, 2011 Excellent info there David. Am i right in thinking that the gears/cogs on the unit itself dont break all that often, its more the gears and cogs in the actual controls? Think a definite clean up/lube of all parts is on the cards for me. Is it a dash out job to get this unit out, or can it be dropped out from the bottom of the dash? Quote Share this post Link to post Share on other sites
Supercharged 2 Posted January 18, 2011 They often jump teeth on the unit itself... Quote Share this post Link to post Share on other sites
OllieVR6 0 Posted January 18, 2011 Excellent info there David. Am i right in thinking that the gears/cogs on the unit itself dont break all that often, its more the gears and cogs in the actual controls? Think a definite clean up/lube of all parts is on the cards for me. Is it a dash out job to get this unit out, or can it be dropped out from the bottom of the dash? When I did my matrix I'm pretty sure there was no way this box was coming out without removing the dash. In fact, anyone who is doing the matrix should take the opportunity to sort out this part while they have the dash out. Wish I had done mine! Quote Share this post Link to post Share on other sites
davidwort 0 Posted January 18, 2011 yeah, you can remove all of the vent tubing and the sections that connect to the footwell vents, but although the whole unit should come to pieces (metal clips etc) the chance of taking it apart under the dash are pretty unlikely, let alone reassembling it. I did improve the movement on the 8v by spraying what I could get at with PTFE spray and this helps a lot, but it all needs a good stripdown and clean really. Definitely a job to do if you have to do the matrix. Quote Share this post Link to post Share on other sites
Kevin Bacon 5 Posted January 18, 2011 They often jump teeth on the unit itself... Yeah, I modified mine some years ago. I had to replace the dowel in the middle with something more substantial IIRC as it kept jumping teeth and then popping out of the heater box. Loads of PTFE grease used too! Quote Share this post Link to post Share on other sites
Supercharged 2 Posted January 18, 2011 When I did my matrix I'm pretty sure there was no way this box was coming out without removing the dash. In fact, anyone who is doing the matrix should take the opportunity to sort out this part while they have the dash out. Wish I had done mine! No need to take the dash out to remove this or do the matrix dude! Quote Share this post Link to post Share on other sites
Yandards 0 Posted January 18, 2011 When I did my matrix I'm pretty sure there was no way this box was coming out without removing the dash. In fact, anyone who is doing the matrix should take the opportunity to sort out this part while they have the dash out. Wish I had done mine! No need to take the dash out to remove this or do the matrix dude! You just need to split the long duct that the blower fan lives in from the central box but it will come out without removing the entire dash assembly, just drivers and passengers lower shelfs and the centre console. Quote Share this post Link to post Share on other sites
