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#1
05-23-2008, 05:56 PM
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A/C dryer question
OK, I am trying to learn how the AC system on my 300cd works before rebuilding it. I was looking at it this morning and I saw that the dryer has 2 electrical sensors on it. The one on the top is hooked up, but the one on the side is not, and the wires are hooked to each other. What are these sensors for, and should the one be shorted out like that?
I have been looking for an AC system explained thread or something, but didn't find it...is there anything like that out there?
__________________
My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much) Wife's - '08 Saab Sportcombi Aero Riding a '03 Yamaha Warrior 
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#3
05-23-2008, 06:28 PM
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I know it's still r-12. Do you know which is which?
I am assuming the one on the side (being shorted) is either keeping the compressor on, or the fan on. Thoughts?
__________________
My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much) Wife's - '08 Saab Sportcombi Aero Riding a '03 Yamaha Warrior
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#4
05-23-2008, 06:32 PM
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I don't remember which is which; one of them will start the fan when connected together with the key on, the other will engage the compressor clutch regardless of pressure with the AC on.
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#6
05-23-2008, 07:54 PM
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OK, wet out to play with the car. The sensor on the side (which was shorted) is for the compressor. The short wire that was made for it was messing up, constantly switching the compressor on and off. I plugged the wires back into the sensor, and it was running great.
The sensor on the top is for the fan. Mine is toast. I am going to replace it (and probably the other one too) when I "rebuild" the system. I am also going to wire in a switch to manually turn the fan on. I am getting cooler air out of the system (70* at 90* ambient temp) so I still think I need to do the "rebuild", but it's better for the time being. I am planning on replacing the dryer, expansion valve, both sensors on the dryer, and whatever seals I take off. I am also purging, and refilling the system with r-12. Does that sound about right?
__________________
My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much) Wife's - '08 Saab Sportcombi Aero Riding a '03 Yamaha Warrior
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#7
05-23-2008, 09:44 PM
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Does you temp switch look like this?
http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2AT0J1QHK2DK1AEZ01&year=1985&make=MB&model=300-DT-001&category=R&part=A%2FC+Temp.+Switch If so, I would not replace it unless it doesn't work. It can be replaced as necessary at any time, as is threads into blind hole on the drier. Also, you won't really need it if you are going to install a manual switch.
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#8
05-23-2008, 09:51 PM
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yeah, that's the one...but I idled the car for like 15 minutes earlier, and it never came on by itself. I shorted the lines myself, and it came on...that's the first time I have ever heard it.
__________________
My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much) Wife's - '08 Saab Sportcombi Aero Riding a '03 Yamaha Warrior
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#9
05-23-2008, 10:09 PM
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If your refrigerant level is low, the switch will never get hot enough to close.
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