Hello, I am new to this forum and a new MB owner. I just purchased my MB about a month ago.

Here's my problem. My air conditioner is not working. There is air blowing but it is not cool. I took the car to a mechanic. He said that best he could tell the system had a good charge but the compressor was not kicking on. That I wasn't getting power to the compressor. He said the Temperature Regulator was bad PN#000 822 0903. He also said the ignition switch was bad and was causing the blower to not blow sometimes. I ordered a new temperrature regulator and put it on yesterday. AC is still not cooling, it is blowing air. It is also only blowing out of the defrost vents and rear passenger vent. I believe this is a vacuum issue that I will look at later.

We checked the plug that plugs into the compressor and it is not getting power.

Help, 100+ east texas humidity. I need a AC.

Go for fixing the vacuum issues first... as your controls at the dash ( may ) and the vent flaps do get affected by vacuum problems...
Your dash may not be telling the AC to turn on...
Can you post pics of your dash buttons / Vertical wheel and under your hood at the firewall ? or maybe you know which ( 1,2,3 ) type of MB AC you have ?

__________________
1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

Is the auxillary fan comming on?

__________________
BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif
15 VW Passat TDI
00 E420
98 E300 DT
97 E420 Donor Car - NEED PARTS? PM ME!
97 S500
97 E300D
86 Holden Jackaroo Turbo D
86 300SDL
(o\|/o)

leathermang I apolize. A friend stopped by who is a fair shade tree mechanic. We went out to look at car. He was able to get the compressor to kick on. But it is not cooling. He jumped two wires that are coming off a relay that is right behind the drivers headlight.

will go take pics now.

on mine, the freeze switch under the dash had failed.
for some reason, the freeze switch also diverts power from the pod that controls the center vents.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Here are the pics let me know if you need more. #1 AC control panel, #2 fuse box in upper right corner, #3 this is right behind the drivers headlight, touched the 2 wires together and compressor kicked on.

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The part we replaced was MB #000 822 0903

Yes I it is coming on.

Since you could jump the compressor on...
you probably need to hook up some gauges next...
you do not want to run the compressor with low refrigerant because that is how it gets lubricated.... oil mixed with the refrigerant...
Do you have gauges...? or does you friend ? I suspect he does not or he would have placed them on to begin with...
and do you know which type of refrigerant you have ?
Hopefully either R12 OR R134a....?

Where exactly was that ' temperature regulator ' located ?

__________________
1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

We only ran it for maybe a minute, just long enough to see if it would start blowing cool air. It is R12, PO has one can I can get.
Should I convert? Have read alot that recommends not switching.
The "temperature regulator" is under the glove box on the right side of the blower housing(?). Can get pic if needed. Now wondering if original Temp Reg. was bad, should I return the one I bought.

Ok.. slow down a little...
That was a legit first test...
It is great you have R12 and you should keep it if there is any way to keep it...
What does that regulator connect to ?
does it have a tube that goes to the evaporator ?
It would help to post a picture of that regulartor....
any chance we are talking about the Txvalve ?
Did you have to open the system to install it...
like let the refrigerant out ?

Really try to answer each question people pose... like the one about gauges... lets try to be systematic about this.....

You do not want to look like ' ".....a line used by famous Canadian humourist Stephen Leacock in his story "Gertrude the Governess".

("Lord Ronald said nothing; he flung himself from the room, flung himself upon his horse and rode madly off in all directions.")

...

__________________
1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

The temperature regulator only has wires going to it. A 12 pin connector.

The part that we jumped the wires looks like a oil sensor? it looks like it screws in to the side of a block, the block is on top of a black cylindrical thing. there is also a tube running into it from one side and another running out the other side then around the end of radiator to a coil.

Don't know what/where Txvalve is.

Did not open system, just electrical plug.

Sorry about that, No gauges around, could purchase some?

The silver box on the right is the temperaturregler MB #000 822 0903, to the left is another box that is the geblaseregler MB #000 822 1103

Attached Thumbnails

 

The electronic temp regulator does not control the compressor.


That's the low pressure cut-out switch. Prevents compressor engagement when system is essentially empty of refrigerant.

Then the refrigerant is gone or the switch is bad. My money is on the first possibility.

Got to leave for awhile, will check in when I return.