"Pressure is OK" makes me shudder a little... You must be referring to
static pressure.. the gauge reading is <?> PSI at <?> degrees F.... Do you
have power to the low pressure cut out switch (sometimes called the clutch
Our 2003 ZX2 had the AC just stop working, took it to dealer and they
replaced some kind of controller for the AC, about $350 for the part
as I remember, it was listed as a typical problem with the car.
Maybe your problem too.
Here is what I found googling it.
The general cause of the no/intermittent AC operation is the failure of the
circuit that engages the AC compressor clutch. This clutch is electrically
operated. The specific problem is the failure of a relay inside a small
electronic module that is mounted in the engine compartment under the air
filter housing. The module is called the Contant Control Relay Module
(CCRM). The CCRM is essentially a metal housing with a single circuit board
inside that has several relays on it. One relay, what Ford calls the 'WAC'
relay developes a poor or broken connection (solder joint) to the circuit
board causing the AC clutch energization circuit to become intermittent or
fail completely. The WAC relay controls the operation of the AC compressor
clutch. Ultimately the WAC relay and the entire CCRM is controlled by the
main vehicle computer or Powertrain Control Module (PCM). The reason Ford
uses this somewhat complex route to control the AC is it allows the PCM to
sense the AC load and adjust idle and other engine parameters. It also allow
the PCM to coordinate the operation of the engine electic cooling fan(s) in
conjustion with AC and other load situations.
To correct this problem you can:
1. Replace the CCRM. A new CCRM will cost about $200 - $300 depending on
where you buy it. It is a fairly easy part to remove and install.
2. Repair the CCRM. If you have basic automotive, mechanical, and
electronics soldering skills you can remove and disassemble the CCRM, and
repair the failed solder joint. This repair will cost $0 but assumes the
mentioned skills and will require a drill/bits (a drillpress works even
better) and an electronics type solding iron. Depending on skill the entire
repair takes about an hour.
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