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#1
06-05-2007, 11:23 AM
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What cycles the AC Compressor on W123
What cycles the compressor on a 77 300D. Other then the switch on the Expansion Valve which I believe only cuts out the compressor when it gets near 32 degrees (ETR??). From what I can tell the switches on the dryer only control fan and cut out the compressor if there is low pressure.
I bypassed the Servo\AutoClimate Control for heat and jumped the compressor to get AC, I just want to wire my manual compressor switch through the correct switches to allow it to cycle. I see on the wiring diagram: Compressor switch (in car) AC relay-Starter cutout Aux fan relay Temp switch in dryer for aux fan - closes at 142F Evaporator Temp regualtor - ETR Last edited by 97E300D; 06-05-2007 at 11:41 AM. 
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#2
06-05-2007, 12:12 PM
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The ETR is what cycles it to keep the evaporator from freezing up.....
__________________
-Matt EPA Section 609 Certified MVAC Technician ----------------- Oil Burner Kartel Member #10 Ahh the smell of Diesel Fuel, it's like coffee in the morning! My Car: 1982 300SD Turbo Diesel (231,500 miles!) RIP  1984 300SD Turbo Diesel Custom (235,500 mi on driveline.) - On Road!!  www.icsrepair.com 
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#3
06-05-2007, 01:46 PM
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Ok where does this part go? It say cycling switch...
Mercedes 1973 - 1995 MT0201 Compressor Clutch Cycling Pressure Switch R12 R134a http://store.lenzdist.com/product.php?xProd=529&xSec=36
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#4
06-05-2007, 06:30 PM
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Looks like it goes on the Receiver Dryer...... Possibly is the high-pressure cut-out........
Call em up.. Those guys at Lenz are great!
__________________
-Matt EPA Section 609 Certified MVAC Technician ----------------- Oil Burner Kartel Member #10 Ahh the smell of Diesel Fuel, it's like coffee in the morning! My Car: 1982 300SD Turbo Diesel (231,500 miles!) RIP 1984 300SD Turbo Diesel Custom (235,500 mi on driveline.) - On Road!! www.icsrepair.com
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Linear Mode
