Originally Posted by URO Parts Support

Coincidentally URO just released Blower Motor Assembly 126 820 0542 for these cars, which retails for about a third of the OEM unit.

Originally Posted by Mike D

Yes, the other vacuum functions would still work as they are supplied before the climate control. They would be a bit slower but since they are supplemented by the vacuum reservoir you probably wouldn't notice the delay.

The fact the fan doesn't engage using the defrost function casts doubt on the pods being the problem. Might be worth checking them out while you are in the process.

You say you removed and checked the CCU. Are you referring to the push button unit mounted in the console?

The actual control/amplifier is located in the right hand side of the dash behind the glove box. Is that the part you checked? There is a relay located on the cabin side of the firewall also located behind the glove box. That might be what you are hearing "click".

To eliminate the pods causing the trouble the easiest way is to remove the glove box and physically observe the movement of the diaphragms. Obviously the vehicle need to be running. The micro-switch is located on the ducting to the right of the main duct work where it joins the center air box.

Originally Posted by Diseasel300

The defrost button should override any other function of the climate control system and force the fan on high regardless of any setting or sensor input. Failure of the fan to come on in Defrost is likely due to a failed temperature regulator box. There are a handful of capacitors in there that leak and literally eat away the copper traces on the PCB. Once that happens, the HVAC gets a mind of its own. The fan control is one of the first things to go. Since you know the blower is good, having the silver "Tempregler" box rebuilt and/or repaired is the next step. Don't get a 2nd hand one (they'll be dead too) and do not waste your time or money with Programma "rebuilds", I'm convinced that their "rebuild" process involves physically attaching a "rebuilt by Programma" sticker to the case.

Originally Posted by Mike D

Here's the jewel Diseasel300 is referring to. Located behind the glove box.


Attachment 155252

Originally Posted by Diseasel300

That's the one. It's the unit that issues commands to the compressor clutch, the black relay box to control the fan speed, and monovalve/aux pump. It's basically the "brain" of the system, so when it gets issues the HVAC system gets a mind of its own.

Originally Posted by MongooseGA

I'll try to open it up and take a look. Is it just a matter of reflowing broken solder joints?