My ac compressor is not engaging and I have jumped the low pressure switch to bring it on and it still does not engage. . . is there a relay problem with the 2001 Ford Winstar SEL with front and rear ac?
Rick
Re: My ac compressor is not engaging and I have jumped...
Test the electromagnetic clutch on the compressor pulley for continuity give it 12 volts it should clunk in if not the clutch is either seized or windings gone
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You can add freon without the compressor running. There is a pressure switch in the system that prevents the compressor from operating when the freon pressure is too low. Just add some freon and once the pressure increases, the AC clutch will engage.
Tap the front of the A/C compressor and see if it engages, if it does the spacing in the magnetic pickup is off. If it doesn't then you have a bad switch either high side or low side of the compressor lines.
most likely the ac compressor will not engage because it needs a freon charge.The simple way to tell if that is why without having special equipment is to find the pressure switch located on the low pressure line and jump the switch with a peice of wire. if the clutch engages when you jump the switch then you need to charge the ac with 134 a freon
Looks like the low pressure switch gets power from a 10amp ac fuse. Power then goes to the ac relay which is powered on by the ac heat controller on the dash. Power then goes thru the high pressure switch to the compressor. The ac relay is grounded to the body. Do you have power on the lite and dark green wires going into the relay and is it grounded ?
Most vehicles have a low pressure switch that prevents the compressor from engaging so as to prevent damage to the compressor. You need to place a gauge set onto your AC to read the high and low sides of the system. Probably have lost enough gas(R134) over time to prevent the compressor from engaging. You can jump the pressure switch to check it with a simple jumper wire.
The low side pressure switch in the AC low pressure line signals the PCM (computer control) to close the AC compressor relay and raise the idle speed. If the system is low on refrigerant charge the relay will not allow the system to engage the compressor, this is because the oil that lubricates all the works is suspended in the AC refrigerant, if that is low then the system gets no lubrication and will quickly seize up..
First thing you should check is all your grounds, on the body and your battery connections. Also double checked to make sure you have the air conditioning on with the fan on. If this is good the next thing to do is to get a wiring diagram. Verify that there's power going into the switching and coming out of the switch. Next find the compressor relay verify that there's power going two it. If this is good use your tests light to ground out the relay. If this works find out where the ground wire goes to the computer or the wide open relay. Good luck.
the control unit is no good.i had a similar situation with a 98 tracker,and installed a switch to give it a ground for the compressor relay that comes from the a/c computer module.
it works good and goes on and off with the a/c switch.
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