Rebuild Temperature Control Unit? PICS

[GHEN]

Hi All,

As you can see in the picture, my Temperature Control Unit (TCU) is in need of attention. This is part number 94465302101

The red line shows where there is a complete crack through the left side mounting plate. The blue box shows the missing Ventilation Switch, and the red arrow points toward numerous smaller cracks.

I am considering trying to create a new mounting plate via 3D printing but I don't know (yet) how everything is mounted to this plate; for example if something is epoxied I'm probably out of luck.

Has anyone dug into the TCU enough to know if this is possible? How about replacement switches and the tiny bulbs?

Any help or pointing me toward a reliable re-builder (if one exists) would be helpful.




Thanks in advance,

GHEN

[944 S2]

Try the other forum (Rennlist). There’s a Canadian guy who has been 3D printing these.
I had the same issue. Look into switch replacement, but it’s 100 bucks just for the switch! And my AC button was no good too. I ended up with a very nice used unit instead.

[kdjones2000]

These acrylic pieces were still available from Por$che if you want to go that route (It looks like they are no longer available). The replacements are for the 911 of the same vintage, and do not have the numbers on them, but function the same.

The switches are way expensive, and to replace the clear piece you need to desolder both sets of switches from the main board. Not for the faint of heart, IMO.

Here is an old post I did on how to refurbish this. I'll update the pictures soon.

http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/652252-fixing-up-climate-control-head.html

[9FF]

Originally Posted by kdjones2000

These acrylic pieces are still available from Por$che if you want to go that route. The replacements are for the 911 of the same vintage, and do not have the numbers on them, but function the same....

Interesting, you made me go check lol. However the 1986 911 climate control unit I have is different to the 944, that acrylic piece won’t swap on to a 944 climate control unit. Is there a specific model year 911 where they are the same?

[kdjones2000]

Originally Posted by 9FF

Interesting, you made me go check lol. However the 1986 911 climate control unit I have is different to the 944, that acrylic piece won’t swap on to a 944 climate control unit. Is there a specific model year 911 where they are the same?

Images are restored to the original thread.

Regarding the 911 reference: Others have said that the one available is from the 944 ROW cars (without the numbers). Ian over at 944 Online sells them, or used to sell them. I could not find a different PN for the ROW units in PET, so not totally sure.

Here is a picture of both of them:
http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/652252-fixing-up-climate-control-head.html#post7374385

[9FF]

Originally Posted by kdjones2000

Images are restored to the original thread.

Regarding the 911 reference: Others have said that the one available is from the 944 ROW cars (without the numbers). Ian over at 944 Online sells them, or used to sell them. I could not find a different PN for the ROW units in PET, so not totally sure.

Here is a picture of both of them:
http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/652252-fixing-up-climate-control-head.html#post7374385

Ah yes I know about the “ROW” plate (#944.653.911.00), it’s not actually a plate just for ROW cars, it was fitted to all the cars without AC, it’s just that all US cars came with AC standard but if you ordered deleted AC on a US car you’d have got that plate/control unit. Anyway it has been nla for some time same as the AC version (#944.653.912.00) has. The 911 variants I’ve seen will not fit, so like you mentioned have you found one that does fit?

[GHEN]

What does ROW mean in this context?

GHEN

[9FF]

Originally Posted by GHEN

What does ROW mean in this context?

GHEN

Rest of the World.

Basically there are US cars and ROW cars.

[kdjones2000]

Originally Posted by 9FF

Ah yes I know about the “ROW” plate (#944.653.911.00), it’s not actually a plate just for ROW cars, it was fitted to all the cars without AC, it’s just that all US cars came with AC standard but if you ordered deleted AC on a US car you’d have got that plate/control unit. Anyway it has been nla for some time same as the AC version (#944.653.912.00) has. The 911 variants I’ve seen will not fit, so like you mentioned have you found one that does fit?

The only source I had found was Ian, and it looks like he no longer has them.

[GHEN]

If you have to repair (because you cannot find a replacement) go here: https://www.tapplastics.com/product/repair_products/plastic_adhesives/tap_acrylic_cement/130 you can order acrylic bonding agent.

I have used this to make acrylic boxes and it flows into the joins (cracks) and essentially chemically welds the pieces together. I am not sure how it would react if it got on the PCB, but I imagine you would want to isolate the plate 1st.

Just a thought.

GHEN

[project425]

Originally Posted by 9FF

Rest of the World.

Basically there are US cars and ROW cars.

Then there are those JDM people. JDM= "fart can installed".

[9FF]

A while back I bought a couple of 3D printed acrylic plates from the Canadian guy that 944 S2 mentioned above. The finish wasn’t as good as the factory items but they fit and worked fine and after all they are hidden so you cannot see the finish once they are in place. Definitely a worthwhile part to 3D print as most will be cracked by now, just need someone to finesse the original file to make it perfect. Here’s an old picture I took before I fitted it. The slight cloudiness of the printed part doesn’t affect operation.

[GHEN]

Originally Posted by 9FF

Definitely a worthwhile part to 3D print as most will be cracked by now, just need someone to finesse the original file to make it perfect.

Mike,

Is there a difference between how this plate mounts on your '86 951 vs. your '89 951?

I read that the earlier cars required resoldering, but perhaps the later cars everything just snapped in.

Do you happen to know if that is the case?

BTW I reached out to the guy in Canada that was making these...no reply so far.

GHEN

[9FF]

Originally Posted by GHEN

Mike,

Is there a difference between how this plate mounts on your '86 951 vs. your '89 951...

In all honesty I cannot remember if I had to get the soldering iron out or not. I suppose if that part of the job is daunting you could send it to ECU Doctors or a similar company to do. I can’t see it being expensive to desolder and resolder a couple of switches.