So, my dog now is miserable with the heater stuck on and we are leaving tomorrow morning for a trip. I was just going to go manual valve rather than electric, but had something say check the electrical before doing anything rash.

Tried both units and get a half volt to the plug which can't be varied. Is this really correct?

Hate to take the rebuilt unit out of the packaging to confirm...

Thank you so very much!

__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.

Which units and what plug?

__________________
When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.

Thank you so very much for the reply!

Oops, long day... Basically I have the original climate control unit, a used unit, and what was a new rebuilt Programa unit. At this point I was swapping the units to see if the reading at the mono valve would change.

I was able to find a snippet of information that it is only in the automatic position that the voltage changes from 0 to 12 instantaneous. However, with the rebuilt unit, I get 0,05 volts on cold and 0 volts on hot. Now what?

__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.

The monovalve should be supplied with system voltage anytime the key is in the RUN position. Switching occurs on the ground side of the circuit. If you don't have constant battery voltage at the monovalve positive terminal, you have a problem.

__________________
When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.

Thank you so very much for the reply!

Turns out number 14 fuse despite Bud the mechanic saying it wouldn't. Now he seems to say he isn't responsible to fix it again...

So thinking I will give a shot at fixing it myself. I am wondering if the two windows are on the circuit, despite not being listed?

The windows are not listed on any of the fuses! Or, did I not get enough sleep?

__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.

Fuses A and B are the windows, IIRC. Like I told you in the Email last night, they're fused in pairs in an "X" pattern.

__________________
1968 230S Automatic, Elfenbein
1975 O309D Executive Westfalia Camper Bus, Blau/ Weiss
1972 280SEL 4,5 Dunkelrot
1966 VW Type 34 "Grosser" Karmann-Ghia
1963 VW 1500 Variant Pearlweiss
1969 VW Variant Automatic, Perugruen
1971 VW Squareback Automatic, Clementine Orange
2001 E320 4Matic Wagon- Our belated welcome to the 21st century! Polar White
1973 280SEL 4,5 Sliding Roof "The Bomb", Dunkelblau.

As a cheap and temporary fix you can simply clamp one of the heater hoses. Use a couple of pieces of anything stiff (wood, a couple of hunks of 1/4" plate, etc.) and a Vice-Grip, C-clamp, or anything else that will stay on there.

Dan