Your light control module(LCM) may not be working. I replaced my air suspension system with regular shocks because of this problem. The LCM is a black box almost the size of a vhs tape found underneath the steering wheel.
In the Power Distribution Box in the engine compartment ( the P D BOX is " live " ) Relay # 303 ( one of the large relays ) is the air suspension relay
Hey Grady==You don't say what kind of car you have but most don't have relays on the compressor. Ihere is a cycling switch on the accumulator that when it is low will keep the compressor from engaging. GoodlukcJoe
GENUINE PARTS MFG: RELAY, F3LZ-2C013-B. DO YOU KNOW THAT YOU COULD REPLACE THE REAR AIR SUSPENSION WITH SPRINGS? NO MORE RELAYS, SWITCHES, AIR COMPRESSOR OR AIR LINES TO WORRY ABOUT. THANKS! J.T.
Besides fuses,there are relays that activate this compresorm most of them located under the hood; however, most of the compresors have a pressure control switch, if you have a small loss of refrigerant, eventually it is going to loose pressure an your compressor will not start to prevent compressor damage. Evacuate the system and refill with the correct amont of refrigerant.
In the relay box next to all the other relays.
If the compressor doesn't start remove all the relays and circuitry installed on it and measure the resistance of the windings A video detailing the process can be found in related links.
2. The 4 by 100 relay and the 4 by 400 relay.
Check under the air filter housing for the PCM (power control module) if you could open it you would see about 5 relays on a circuit board one of the relays is for ac compressor. In general change the PCM.
Mabe your compressor is not kicking on for some reason. Check to see if the front of your compressor starts spinning when you turn it on. If it don't check to see if there is power to the wires that go to your compressor. If there is power you have a bad compressor. If there is not check the fuses or relays.
I was looking at the power distribution box diagram for your 1998 Ford Expedition and it shows ( 6 ) relays but none of them are labelled for the air suspension In the P D BOX : fuse # 4 is a 15 amp mini fuse for the air suspension service switch and fuse # 15 is a 50 amp maxi fuse for the AIR SUSPENSION SOLID STATE COMPRESSOR RELAY ------------------------------------------------------------------------------------------------------- Just adding to my answer : I did a Google search and found that the solid state air compressor relay is mounted on a bracket near the passenger side headlight
Have you checked the relays?
The CCRM is a set of relays in the same box. The relays control the radiator cooling fan, the PCM, the fuel pump and the A/C compressor. Pre-97 Escorts had separate relays on the above functions. Starting in 97 continuing through 2002 they put all the relays in one box.
have u checked ur relays?
Look under the hood in the power distribution box and you will see a group of relays and it will be the top one on row one (compressor clutch relay).........
Assuming you have checked the bulbs, check the brake light switch.
The CCRM is a set of 4 relays in one module. The relays are : 1. Relay for the PCM (Powertrain Control Module) 2. Relays for the high and low radiator fan speeds. 3. Relay for the fuel pump. 4. Relay for the Air Conditioning clutch on the compressor.
AC compressor clutch relay, starter relay, high speed blower motor relay,
Under the hood in front part close to the right side of radiator there are 3 relays
To operate a relay ( I am calling "third relay") from two separate parallel control relays is called logic "or". Connect the power wire coming in to both of the paralleled relays' switch common contact. ( These relays are up to you to wire their coils and activate.) Depending on the logic required you will wire the third relay coil to the paralleled control relays normally open or normally closed contacts. That is: Do you you want the third relay to go on with the control relays activation or off?
Depends on the make and model of the vehicle. On newer cars check the power distribution box where the relays are located.
that my be caused by a faulty fan switch
Under the hood near the air compressor. it is mounted to a bracket on the rh side. it will look like a square box aprox. 1 inch square. 2 Relays will be mounted side by side will be green or brown at the base with a black plastic upper cap portion.
There are no fuses on the firewall to my knowledge but there is at least two relays, one is the AC compressor clutch relay and the other is the starter relay.
If your headlights, horn and everything work, I would have the ignition switch checked out. Make sure you checked all ingition fuses and relays first.
Check the following.......... 1. Power and ground to the compressor clutch coil.. 2. Pressure switches and relays.. 3. A/C -heater controller.. Without the year, make and model its very hard to narrow it down..