A/C compressor wont engage, weird electrical issue??

ANSWER : Go to fuse 21 in the engine compartment to see if power goes away when you test it while the compressor is connected. If the power stays above 12.5 volts, check connections to the A/C clutch relay in the power distribution center next to the battery. If the connections are good then replace the relay and retest the components. The connection should not be loose and may show signs of heat or arching on the relay and connector. If you need some help with this issue, consider YourMechanic, as a certified technician can diagnose the cause of this electrical issue and fix it accordingly.

ANSWER : Hello. From what you describe it sounds like one of your vehicle’s relays may have failed. If the vehicle is no longer starting it may be possible that one of the relays associated with the starting system has gone out and needs to be replaced. Relays are electrical components that act as switches for the electrical system. They are often times located in the vehicle’s fuse panels, and beneath the dash. It is not uncommon for relays to burn out or shirt circuit and require replacement. If the smell and noises appear to be coming from underneath the dash I would check for possibly faulty relays their first. Similar symptoms can also be caused by faulty wiring or connectors. I would recommend having a professional technician, such as one from YourMechanic, come to your location to diagnose the no start condition and electrical issues.

ANSWER : Check all ground connections in the circuit. Inspect the fuseholder itself. Although the fuse may be good, if there is too much resistance in the connection, you’ll get a voltage drop. Same holds true for the relay. In fact, relay contacts can have enough resistance to create a voltage drop. If the fuse and relay, and their contacts are all pristine, and power is leaving the relay but not making it to the clutch coil, that means the wiring to the clutch coil has a defect. You can just simply abandon the existing wiring and install a new conductor through an appropriate (safe) path and crimp on a new terminal. If you desire that a Mechanic trace the circuit and resolve this for you, using the wiring diagram in the Factory Service Manual, please request an electrical circuit/component diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

ANSWER : Hi there. It sounds like you may have one or two concerns here. Does the AC indicator light up when you turn it on? If so, this means that the command for AC is active. If the light flashes, this means the module is telling us that the compressor is not turning. If the light does not turn on, there may be no signal to the clutch. The system does not hold much oil and you may not have seen much come out of the compressor. Inspect any oil that has come out for metal specks or a greyish color; this would indicate compressor failure and now there is metal throughout the system. I strongly suggest having a qualified technician inspect the system, both mechanically and electrically to determine the root cause/causes of your concern. Your Mechanic has several technicians available that can assist you with an ac system inspection and provide an estimate and direction of repair.

ANSWER : The blower not working is most likely due to a fault with the blower resistor. When you go to high blower speeds the A/C may disengage the compressor if the cycling switch cycles or the high pressure switch gets over pressurized, shutting the compressor off. The first thing to do is to get the blower working correctly then test the A/C pressures using A/C gauges. If you’d like to get this fixed, consider YourMechanic, as a certified technician can diagnose your A/C issue and fix it accordingly. Good luck.

ANSWER : Hello. From what you describe, it sounds like there may be some sort of issue with the clutch pressure / cycling switch. These switches are responsible for activating the compressor when they detect that the pressure is at or temperature has reached a certain threshold. If they are not functioning properly, or there is an issue with the circuit or wiring, then they may cause the system to malfunction. I would start by testing the switches to see if they may need to be replaced and going from there. If you need help having this scoped out, a certified expert from YourMechanic can come to your home or office to diagnose the AC system and guide your through a repair.

ANSWER : Hello. You are likely experiencing an engine failure of some type. Do not let this scare you at first. All of these systems that are failing depend on the engine functioning correctly in order to do their job. Without vacuum you will have a hard brake pedal. Without pressure to the power steering system you will not have assisted steering and it may feel like the wheel is locked. The ignition will also depend on having an electrical connection for the sensors to work correctly. Did you notice this when you went to start the vehicle, or did this happen when you were driving? If you discovered this when you went to start the vehicle, check the battery and ground connection first. If this happened while driving then you will need to find the reason your vehicle stalled.

ANSWER : Hi there. Since you just replaced the compressor, it may be that the AC system is overcharged making the compressor hard to turn. It is also possible the new compressor itself is defective.The best advice we can offer here is to have one of our professional mobile mechanics come to your location and complete an AC is not working inspection. This will allow them to inspect your vehicle and determine what exactly is causing this noise and then recommend a repair that should resolve the issue. Since there are multiple possible sources, providing you a good estimate for repairing this issue would be very difficult.