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Old 07-28-2013, 12:07 PM
ah-kay ah-kay is offline
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Join Date: Mar 2009
Location: San Diego
Posts: 3,099
Originally Posted by tyl604 View Post
'81 300SD. My Freon is very low or gone. If I run it some to keep the o rings pliable, will I hurt the system? Will it burn up the compressor?
It all depends on what do you mean by running it some. There is a low freon pressure switch in line with the compressor clutch to stop the compressor from running. If the compressor runs then you have enough freon to activate the switch so it is OK. If you jump the switch because of no/low freon to test the system than it is best not to run it for more than 30 seconds.

People jump the switch quite often for a short while - to test the system or do the initial recharge.
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details.

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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