dodge nut

Parked my 06 last night everything seemed fine now ac won't work today. Compressor clutch not engaging. Tried to put a can of freon in but without the compressor running no luck. Used to be able to bypass the low pressure switch on my old trucks but could not figure how to make it happen on this one????

Zeus1987

check fuses ?

dodge nut

Checked the main fuse box under the hood can find no problems there. Of course none of the fuses are labeled as being for the ac so I checked them all.

jderekg

check fuses...prob not it though...its the clutch assembly, compressor is fine but you cant get parts to fix clutch. put in the new 440.00 compressor and it will work.

dodge nut

surely there must be someway to test the compressor clutch assembly. On Chevy's you could put a jumper on the low pressure switch to make the clutch energize. Could not figure out how to make it happen on my Dodge. Is there possibly an in-line fuse to the compressor???

jderekg

you can try taking something and slapping the end of the clutch to try and get it to engage. if it does it will stay engaged till it cycles off then it wont re-engage. slapping it on the end will pull it up to the magnet. mine was so worn it wouldnt pull it up to the weak magnet.

dodge nut

I will give that a try today. Did you change the dryer when you changed the compressor?

2003Ram

You may have a leak in the system. When mine quit, I found that the serpentine belt had worn a hole in the line running from the front cooler to the compressor. The symptom was compressor clutch would not engage.

koot

mine did the same thing it was the coil in the clutch burned up could not figure out ho to jump it without suplying power to the coil . checked the power on the pigtail showed no power but it is controled by the computer and i guess it was kiling the power to the bad coil made me think it was something like a fuse or switch changed the clutch coil out and works fine but that burned up in 6 weeks so i got a compreser from dodge for like $330 and been working for 2 years

koot

just finished my sig wanted to see it in action, not to start brand war but dont buy a valair

dodge nut

I guess I need to bite the bullet and change the compressor and see if that works. Also realized today that the clock on the radio is gaining time. I wonder if there is something electrical malfunctioning that could cause both problems. It a shsme but the local dealer shop isn't capable of fixing a flat much less something like this and the out of town dealership I used in Houston is now closed.

dale29

have the dealer run a diag on it, mine turned out to be the tipm (module), it needed to be reset, They charged me $200.00 (I don't see how hey can sleep at night!) but thats cheaper than a compressor.

dieselfumes57

on my 06 it did the same thing and a week later started working on and off. Come to find out it was the clutch that was bad. New ac compressor.

madhat

I would not change the compressor until I had it checked... when ever you break the seal on AC parts, you better be sure.

I had the same problem on a chevy, and it was the low pressure switch.

Check the electrical connections going to the compressor.

Let me look in my dealer manual...

madhat

Check this out...
A/C PRESSURE TRANSDUCER
DESCRIPTION
The A/C pressure transducer is a switch that is
installed on a fitting located on the refrigerant discharge
line between the compressor and the condenser
in the front corner of the engine
compartment. An internally threaded hex fitting on
the transducer connects it to the externally threaded
Schrader-type fitting on the discharge line. A rubber
O-ring seals the connection between the transducer
and the discharge line fitting. Three terminals within
a molded plastic connector receptacle on the top of
the transducer connect it to the vehicle electrical system
through a wire lead and connector of the headlamp
and dash wire harness.
The A/C pressure transducer cannot be adjusted or
repaired and, if faulty or damaged, it must be
replaced.
OPERATION
The A/C pressure transducer monitors the pressures
in the high side of the refrigerant system
through its connection to a fitting on the discharge
line. The transducer will change its internal resistance
in response to the pressures it monitors. The
Powertrain Control Module (PCM) or the Engine
Control Module (ECM) depending on engine application,
provides a five volt reference signal and a sensor
ground to the transducer, then monitors the
output voltage of the transducer on a sensor return
circuit to determine refrigerant pressure. The PCM/
ECM is programmed to respond to this and other
sensor inputs by controlling the operation of the air
conditioning compressor clutch and the radiator cooling
fan to help optimize air conditioning system performance
and to protect the system components from
damage. The A/C pressure transducer input to the
PCM/ECM will also prevent the air conditioning compressor
clutch from engaging when ambient temperatures
are below about 10° C (50° F) due to the
pressure/temperature relationship of the refrigerant.
The Schrader-type valve in the discharge line fitting
permits the A/C pressure transducer to be removed
or installed without disturbing the refrigerant in the
system. The A/C pressure transducer is diagnosed
using a DRBIIIt scan tool. Refer to the appropriate
diagnostic information.
DIAGNOSIS AND TESTING - A/C PRESSURE
TRANSDUCER
The A/C pressure transducer is tested using a
DRBIIIt scan tool. Refer to the appropriate diagnostic
information. Before testing the A/C pressure
transducer, be certain that the transducer wire harness
connection is clean of corrosion and properly
connected. For the air conditioning system to operate,
an A/C pressure transducer voltage reading between
0.451 and 4.519 volts is required. Voltages outside
this range indicate a low or high refrigerant system
pressure condition to the Powertrain Control Module
(PCM) or Engine Control Module (ECM) depending
on engine application. The PCM/ECM is programmed
to respond to a low or high refrigerant system pressure
by suppressing operation of the compressor.
Refer to the A/C Pressure Transducer Voltage chart
for the possible conditions indicated by the transducer
voltage reading.
REMOVAL
NOTE: Note: It is not necessary to discharge the
refrigerant system to replace the A/C pressure
transducer.
(1) Disconnect and isolate the battery negative
cable.
(2) Disconnect the wire harness connector from the
A/C pressure transducer.
(3) Remove the A/C pressure transducer from the
fitting on the discharge line (Fig. 15).
(4) Remove the O-ring seal from the A/C pressure
transducer fitting and discard.
INSTALLATION
NOTE: Replace the O-ring seal before installing the
A/C pressure transducer.
(1) Lubricate a new rubber O-ring seal with clean
refrigerant oil and install it on the A/C pressure
transducer fitting. Use only the specified O-rings as
they are made of a special material for the R-134a
system. Use only refrigerant oil of the type recommended
for the A/C compressor in the vehicle.
(2) Install and tighten the A/C pressure transducer
onto the discharge line fitting. The transducer should
be hand-tightened securely onto the discharge line
fitting.
(3) Connect the wire harness connector to the A/C
pressure transducer.

Look at #5, it shows the wire and the plug... hope this is it...




Hope this helps a little. I can give you more if you need it...