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99 deville
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Discussion Starter #1
When the freon level is to low on my 99 deville the a/c pump won't start up. How do I manually override the safety switch to turn on the pump so I can recharge the a/c ?
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,261 Posts
When the freon level is to low on my 99 deville the a/c pump won't start up. How do I manually override the safety switch to turn on the pump so I can recharge the a/c ?
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the correct method would be to
connect the AC gauge set HIGH and LOW connectors -
connect the 134a supply tank to the yellow service hose -
start the engine -
set the AC to 60* -
center vents -
medium fan speed -

clear the codes -

open the LOW side valve to release freon into the system -

install the correct MEASURED amount of freon -

close the valve -
 

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If the system is empty it might neither set a code nor display a message. In that case you need to find the leak source, repair it, vacuum the system and then refill it.
 
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