I have a 2010 Dodge grand Caravan 3.8 L engine. My AC clutch will not engage I know my wiring from the PCM to the TIPM Board is all good. I know that I have proper pressure of R134 in my system. I know my pressure transducer is good. I know my clutch is good because I can engage it from my other Dodge van. I just ran a wire from my 2008 Dodge Caravan connector feeding my clutch and ran it over to the 2010 Dodge Caravan AC clutch and I could turn it on and off from my 2008 van.
I also swap the pressure transducer between vans so I know that is good. I can Never get any voltage to engage the clutch. What should I do next? I guess all that is left is the control unit and the dash, the evap temperature sensor, Or the PCM or the TIPM board: This van also has the rear air-conditioning unit which I have blocked off Because of a Freon leak.
I’d appreciate any ideas, I don’t have a diagnostic tool, I only have a code reader and it’s not throwing any codes.

 

a code reader won't access body codes...which is where a/c faults set.
how have you verified proper charge level? home charging kits are not accurate.
the compressor is turned on from the pcm. the pcm must see proper charge level from the pressure transducer (low psi cut off) and in range evap temp (high pressure cut off). if all 3 things are working it may be a power feed problem from the tipm or control problem from the pcm. these require a scan tool to verify.

 

I found a mechanic who had a snap on diagnostic tool. He could not access the HV a C codes, but he was able to activate my AC clutch and turn it on and off from his device. So that tells me that my connections from the PCM to the TIPM Board are good. I have already swapped the pressure transducer for my 2008 Dodge Caravan, which by the way has a working air conditioning unit, so the only thing left is the control unit and the evaporator temperature sensor. So I got underneath the passenger side and found out that my evaporator temperature sensor was unplugged, so I plugged it back in. However my AC clutch will still not engage, I think a code Has been stored in my HVAC control head that is preventing my AC clutch from turning on Because of the disconnected evaporator temperature sensor.
I did measure the resistance of the evaporator temperature sensor and it is about 4K ohms Which seems to be about the same resistance that’s in my working air conditioner in my 2008 Dodge grand Caravan. I even tried to Bypass my pressure transducer But my AC clutch will still not turn on.
i’m not sure what to do at this point, as a last resort I disconnected both of my battery cables and wire tied them together overnight hoping that it might clear out the HVAC codes in my control head. I guess I’ll find out tomorrow. If anyone has any other thoughts I would appreciate it. I made it for us just to bring it to the dealer and let them clear out the codes that’s gonna cost me 150 bucks.

 

I found a mechanic who had a snap on diagnostic tool. He could not access the HV a C codes, but he was able to activate my AC clutch and turn it on and off from his device. So that tells me that my connections from the PCM to the TIPM Board are good. I have already swapped the pressure transducer for my 2008 Dodge Caravan, which by the way has a working air conditioning unit, so the only thing left is the control unit and the evaporator temperature sensor. So I got underneath the passenger side and found out that my evaporator temperature sensor was unplugged, so I plugged it back in. However my AC clutch will still not engage, I think a code Has been stored in my HVAC control head that is preventing my AC clutch from turning on Because of the disconnected evaporator temperature sensor.
I did measure the resistance of the evaporator temperature sensor and it is about 4K ohms Which seems to be about the same resistance that’s in my working air conditioner in my 2008 Dodge grand Caravan. I even tried to Bypass my pressure transducer But my AC clutch will still not turn on.
i’m not sure what to do at this point, as a last resort I disconnected both of my battery cables and wire tied them together overnight hoping that it might clear out the HVAC codes in my control head. I guess I’ll find out tomorrow. If anyone has any other thoughts I would appreciate it. I made it for us just to bring it to the dealer and let them clear out the codes that’s gonna cost me 150 bucks.

 

Disconnected HVAC temp sensor