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AC problems 900 1993

uid 44536's pic
posted by  darkdelta on  Fri Dec 11 16:35 CST 2015
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last visit: Fri Oct 24 12:52 CST 2014
[RELATED]

1993 245 NA with a Manual Climate Control (MCC)

My AC has stopped working, here is what I know:

The AC On/Off switch in the MCC will toggle 12 VDC on one side of the drier mounted pressure switch.

With the MCC switched to AC on I get 12 VDC on one side of the pressure switch mounted on the drier, the other side of the switch does not have voltage.

With the engine running, I measured the filling port with the R134 tag it read around 15 PSI, I added enough R134a to bring the PSI up to 25 PSI. I stopped there.

Using a jumper for the drier mounted pressure switch, I can get the cooling fan to run, and the compressor clutch to engage. I did this for only a few seconds.

Additionally, I have changed the drier mounted pressure switch with no change in condition.

Does anyone know at what PSI does this switch make?

Thanks in advance for any input.






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