The air comp doesn`t engage and the guages read that it doesn`t need freon. This is on a 2001 venture. Is there anything else to check before it goes to the shop?

If the ac compressor clutch turns on and off constantly, it could be low in freon,make sure it has freon,you can purchase freon cans already set up with a hose and a guage to read your freon pressure
if the freon pressure is normal, check the switch at the accumulator a long cylinder with a switch and a molex with two wires attached to it, with your ac running on high, move your molex it could be making a
bad connection, if the molex is okay, jump out the molex, if the clutch engages and stays running, just
replace the low pressure switch. good luck!

Check fuses and AC relay, check system pressures with AC manifold gauges to determine system charge capacity. If it is below sensor limit on freon, the comp. clutch will not kick in. I hope this helps.

R-134 a get can with guage on it place on air conditioning of car start turn on ac fill read guage to full.

Hey M, the pressure could be nothing but "hot air" and not freon... (I had this same problem!!) I let off a bunch of pressure..(nothing but clear hot air!!) ..using a small flat punch..on the low pressure side... if freon on comes out right away..stop.. if nothing but hot air comes out.. keep letting it out until freon comes out,,, When mine started letting out freon,, I quit and tried the A/C again... and it has been working fine since.. Just my recent experience!!!!

First, why are you changing the A/C compressor? The most common problem is the clutch that goes bad and won't engage. It's a magnet and they get rusty and needs to be changed. If it's just not working it could just be low on freon. A comp. won't engage if the pressure is too low. You need to "jump" the sensor with a wire to make it kick in to refill the system. Another thing is that the system is under pressure, so when you unhook the lines freon blows out into the air which is against the law. It needs to be evacuated with a special machine.(By a qualified repair shop)

pull connector off by evaporator can and cross a wire between the connector holes to close the circuit and this should keep the clutch engaged to let the freon go all the way through the system. If the vehicle was just reserviced the gauge will show full but it has not been pumped through the orifice tube area to the coil that cools your van interior. hope this helps.

as to abs problem have a bad sensor or sensor connection not secured to clip did mech scan for codes scanner would explain which side is setting off light ac can be any thing from no freon in line compressor wont come on to fuse/or control at dash if getting power to compressor a/c-clutch may be bad or needs more freon to engage clutch the mech should have given you the codes that set off the service eng soon

check the make sure you have no air in your system if there is an air bubble trapped in behind the thermostat your thermostat wont open and your car will heat up and stay hot while letting a small amount of coolant through the bypass so it wont overheat

You could have possibly lost all the r134a refrigerant from the system, and with no a/c pressure, the pressure sensor will not allow the compressor to engage, or you could have a faulty a/c pressure transducer (pressure sensor). Check your refrigerant charge first. If it is properly charged, then your pressure sensor could be the problem.

sounds like your low in coolant. this will cause an air pocket in engine and cause erratic temp readings/loss of heat check coolant in radiator when cold. and add