Automotive air conditioning fan can not normally open fault - car air conditioning, cooling fans, open - auto repair and maintenance industry
Fault a: 1 Age Superman car, turn on the ignition switch failure phenomenon is electromagnetic clutch on the work after the air-conditioning, cooling fan also work. The user reflect this fault has been repaired factory repair, but the problem is not resolved.
Take car, I first disconnect the A / C switch, the outdoor temperature switch, temperature control air conditioning relay switch and 13, the compressor is working. For fast troubleshooting, we should clear the car air-conditioning system control theory.
The basis of these control principle, first check the fan controller circuit, because the electromagnetic clutch is directly powered by it. However, according to Drive Members say the car to have changed a new controller, it should be the other switch signal is not normal. When the disconnect switch combination air pressure, air-conditioning magnetic clutch stopped working. According to the schematic, we can see high-voltage switching power supply from the ignition switch. If the pressure switch is often at all, then the fan controller air-conditioning systems will be identified to the normal air-conditioning systems in high-pressure state at this time, it will be connected to cooling fans and compressors. Check the switch with a multimeter, the result is always through.
The replacement of a new pressure switch, troubleshooting. Fault 2: an era of Superman car, air conditioning compressor to stop working for half a minute, but soon they work, the work of half a minute then shut down, so repeatedly.
At first I thought it was caused by system pressure, but with a normal pressure gauge measuring system. Since the system pressure is normal, the question should appear on the control circuits or components.
To facilitate inspection, starting the engine and turn on A / C switch, when air-conditioning magnetic clutch repeatedly pull off, but the cooling fan has been operating normally. From the flow chart (Figure 2) can be seen: if the fan and cooling fan can work properly, failure should be below the outdoor temperature switch electrical circuit. To quickly find the failure point, I decided to first test the engine compartment with Shi Dianbi the switch performance. First test with Shi Dianbi between electromagnetic clutch fan controller to the wire, Shi Dianbi sparking, indicating failure in the fan controller is more related circuits. Then switch to the fan from the outdoor temperature controller in the middle section of check, the allocation of air pressure under the combined switch, then pull electromagnetic clutch stop, combined with Shi Dianbi test pressure low pressure switch terminal line, one end of the light is, one end does not shine. Close A / C switch light is at one end also will power, this should be the next problem is the low air pressure switch combination switch to cut off air to the fan controller relay or between the lines or electrical components. Plugged pressure combined switch, turn on A / C switch, combined with Shi Dianbi test pressure to the air conditioning off relay switch between the lines, Shi Dianbi Always, cut off the relay with Shi Dianbi test air to the fan controller circuit, Shidian Bi 1 flash flash of. At this time to determine fault coverage is the breaker itself and the lines, but lines are generally not a problem, we first removed the circuit breaker to replace the test, troubleshooting.
Open the breaker, it was discovered has been serious erosion contact, contact surface is small, but what caused the contact between the current excessive it? After asking the user, that this car some time ago just looking from another air-conditioning compressor, because the bearings, "locking", insurance insurance, air-conditioning compressor fuse box also damaged.
This point, also get to the bottom of the cause of the malfunction. The replacement of the air conditioning compressor and insurance fuse, though at that time the system will work, but due to irregular compressor locking, electromagnetic clutch will certainly slip, the coil current would be too large. Air cut off relay is caused by too much contact the last current severely damaged, some time after the connected part of the increased resistance due to temperature increase led to power outages, but power off after the temperature dropped further reduced the resistance of the circuit is connected Link to the above failure.
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