Question about 1999 Dodge Ram

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Ac pump turns on and off constantly. checked pressure of system and ok pressure when pump is off then loss of pressure when on. no cold air at all.

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That is a low refrigerant sign you need to charge the system.. the compressor shuts off because the low preasure shutdown switch is triggerd when the compressor starts to move the refrigerant to the high side and shuts off thats why the preasure drops when the compressor clutch engages...

hope this helps.
Ron

Posted on Aug 01, 2009

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Or perhaps your evaporator(small radiator like unit behind dash) can get freezed up caused by either too mutch system gas(check pressure) or poor opperation of the expantion valve. the evaporator then has a sensor(themometer) wich measures evap. temp and if the value drops below spec (usially round about7degrees) the ac compressor will be cut once again(fail safe)

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