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My a/c compressor only comes on if I jump it directly. My fuse has power and my relay has power. My a/c control panel does all it regular functions. I am presently using the a/c by jumping it but it freezes up all the time. What do I need to do to fix it.
I had it checked, it has enough freon, but I am still not get any power to the compressor. How do I check my a/c control panel to see if it is working. I had it checked, it has enough freon, but I am still not get any power to the compressor. How do I check my a/c control panel to see if it is working.
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Is the system full of refrigerant ? Low pressure cut out switch could keep the compressor from engaging > The PCM/ECM -engine computer controls the engagement of the compressor clutch. Rather then jumping the relay, test for power an control . If you pull the relay out of the fuse box an look on the bottom of the relay , you will see 4 sets on numbers 30 & 87 - 85 & 86 . you proved 30 has battery voltage by jumping it to 87 , now you need to check the control side of the relay . Pin 86 should have battery voltage while pin 85 supplies a ground through the PCM/ECM .
So the relay coil is not being energized. You will need to determine why. It could be the ground signal from the PCM, which is effected by the control panel A/C switch or else it is the positive signal from the 10 amp CRUISE fuse, which must pass thru the pressure switches (high and low). First check the fuse. If the fuse is good, use a 12 volt test light to probe the relay socket to see which signal is not getting to the relay. Connect your test light clip to chassis ground, start the car, turn the A/C on, and probe the relay socket. There should be 2 hot terminals in the socket--one from the 10 amp compressor fuse, which you have been using to power the clutch, and one from the pressure switches. If you don't get this second hot terminal, try jumping each pressure switch connector one at a time to see which one is not closing. If you DO get both hot signals, the problem is the signal from the PCM. Move your test light clip to battery positive and probe the relay socket again. If the negative signal is absent from the relay socket, only the clutch terminal will show any voltage. If this is the case, you will first need to check the continuity of the wire (dark green with a white stripe) from the PMC connector 2 pin 47 to the relay socket. If the wire is good, the problem may be in the control panel. If you get this far and/or you get stuck along the way, please get back to me.
have you checked all the fuses under hood in black box? relays may be good but theres no power or that light should come on. if all your fuses are good then may be that the heater control panels bad. i would make sure that the compressors plugged up, check all those fuses, then go towards a bad heater control panel.. hope this helps!!
Check for a fuse that indicates radio and replace it if it's burnt through or melted or discolored. The Buicks have dash controls that require expensive repairs sometimes to get the temperature controls to work so some people jump around the controls by installing a separate toggle switch that directly turns the AC unit off and on for 92 through 94 Buicks. Any AC shop can install the bypass wires.
look in the fuse panel at fuse #22 and fuse # 23 for power. fuse # 22 controls the a/c compressor clutch relay, and fuse # 23 controls power to brake switch. with the car running and the a/c switch on check for power on both sides of both fuses again. remove fuse # 23 and recheck for power on the a/c fuse. if no power to fuse for the a/c then you either have a short in the wiring between the a/c and the brake switch fuses. if you have had someone to do any electrical work on the inside of the car they have tapped into the wiring under the dash or the fuse panel to connect the the two wires together to get power. the brake switch wire and the a/c wires are not on the same circuit. the wire you can check on the outside next to the fuse panel will be a pink/dark blue wire controlling the brake switch (power). and the wire for the a/c compressor clutch relay will be red/ lite green or red/ black controlling power to the relay. you may look under the fuse panel to see if the wires for fuse #23 and # 23 are touching together causing a short.hope this will help!!!!
sounds like a ac compressor relay is not working. check the relay panel usually there is another relay of the same type to switch out and see if that works.
Most of the control relays for the vanagon AC can be found on the drivers side D pillar under the plastic or in the cabinet if you have a cabinet. Best to buy a 'Bentley' factory service manual to help out. Cane Rattler...1989 Vanagon
I had it checked, it has enough freon, but I am still not get any power to the compressor. How do I check my a/c control panel to see if it is working.
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