Question about Dodge Ram 3500
If compressor isn't kicking in, check the connector atop the a/c accumulator, beside the coolant recover tank, in the engine compartment. That connector is atop a black bottle, and the connector goes to the low pressure switch. These switches do fail, and you can jump a wire across the connector terminals to see if the compressor comes on (engine running). As this circuit provides part of the ground path from the compressor clutch, if the switch is open, the compressor will never turn on. If the switch is failed, it can be replaced without opening the a/c system. Just disconnect the connector, unscrew the switch, replace it, and reconnect the connector.
Posted on Aug 08, 2008
the low pressure port is the charging port, this port is either in the low pressure line or the accumulator that the low pressure lines to to (can shaped object), the low pressure line is the larger of the two lines from the compressor.
Posted on May 27, 2009
SOURCE: Dodge Ram AC not blowing cold
By pass both pressure switches one at a time with small wire or a paper clip. If comperssor kicks on replace the swich that you bypassed.
if not it could be the fan clutch ot the compressor. Compressor runs about $400.00
Posted on Jun 23, 2009
My 96 accord had the same prob. if you don't have a leak you need to make sure
of that first if no leak and not over charged ( my 96 accord holds 22.9 ounces of 134 )
anyway the fan on left side of motor was bad I replaced it and it works great.
Day/Night and inbetween
Posted on Jun 28, 2009
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