Where is the compressor clutch relay f25O 2002

Hi Adeyeri

Keep in mind that the Clutch won't engage for a few safety reasons.

Temperature inside vehicle
Temperature of compressor or pipes
Pressure inside pipes
Compressor jambed
Eg It's out of refrigerant Gas

You can momentarily engage the clutch by simply giving it +12v to the wire attached to clutch. Usually has a connector close by.
Or
If it has a Relay (click) in fuse box
You can by pass it with a jumper

A quick engage & disengage should allow you to detect possible problem.
But don't over ride the built in safety for more than about a minute.

Cheers
Hope this Helps

Vehicle Air Con testing YouTube

FIXED Car Compressor Clutch Won Engage

12 Volt Car Relays Used In Automotive Industry

The low pressure switch is just a sense input to the PCM - powertrain control module > Grantit , it is needed for the PCM to know the pressure in the system . But the PCM must energize the compressor clutch relay for the compressor to engage . Finding the compressor clutch relay in the under hood fuse / relay box an testing there would be the best place to start . Pull the relay out of the fuse box , look on the bottom ! You should see four set's of number's ,30 & 87 plus 85 & 86 . 30 & 86 should have B+ voltage . Use a multi-meter to test . 85 goes to pin # 1 connector 3 at the PCM . The PCM supply's a ground here to energize the relay if condition's are right . You could jump pin's 30 & 87 an if the compressor clutch coil is good ,the compressor clutch will engage . Video's on youtube showing how to do these test .

If you did not use a vacuum pump from a dry system them the system will not work.

You have a compressor relay open the relay and expose the switch this is now a tool (take out the cover of the relay) with cover out and switch exposed insert the relay back engine running A/C switch on the relay should close if and clutch should come on. If it doesnt collapse the switch it self if the clutch compressor comes on you problem reside in the control switch

If you are handy, yes you can. Most likely causes are loss of freon which would prevent the compressor clutch from being engaged and operating the compressor, a lack of 12 volts being applied to the compressor clutch because the a/c compressor fuse or relay has failed, preventing the clutch from engaging the compressor, or the compressor clutch itself failing. Easy test is to watch the compressor pulley with the motor running. The pulley will, of course be spinning, but the circular assembly mounted to the front of the pulley will spin with the pulley only when the compressor is engaged. There is a sensor mounted to the a/c line that prevents the clutch from engaging the compressor if there in not enough freon in the system. You could go to auto zone or checker and buy a can of freon r-134 with a hose for around $15.00. It is fairly easy to follow the instructions to charge the system. If, after allowing some of the can to pressurize the system, the compressor clutch engages then you can continue to charge the system. Cold air should start to blow by the time the can is empty. Or you can locate the a/c relay located in the fuse panel, remove its plastic cover and manually close the contacts while observing the compressor pulley assembly. If the clutch doesn't engage then the problem in probably electrical, a fuse, the relay or the electric clutch itself. Go to auto zone and check you their dvd on a/c repair for under $9.00. Hope this helps! Dano

Compressor uses a clutch that is activated electrically by a relay. When you turn on the A/C, you should hear the clutch engage and pull power from the engine. If the clutch is not engaging, there may be several reasons:
wiring problem
HVAC switch failure
relay failure
compressor clutch failure
low refrigerant level

There is a sensor that checks the system return pressure and will not allow the clutch to engage if the refrigerant level is too low.

There is a good chance that the electro magnetic compressor clutch is bad and will need to be replaced. The compressor is good, but the clutch system has a short in it at the compressor's clutch, which is causing your fuse to blow.
Test the connection at the clutch for a short if you have a multi meter. If it shows you have a short, then replace the electro magnetic clutch solenoid.
Thank you for using fixya and be safe.

SOUND LIKE AC COMPRESSOR CLUTCH COIL IS OPEN.ITS GETTING POWER YOU HAVE A OPEN COIL CIRCUIT.

CHECK COMPRESSOR CLUTCH FUSE AND RELAY.IF BOTH IS GOOD.CHECK TO SEE IF POWER GOING CLUTCH IF YES CLUTCH IS OPEN.NEED REPLACED YOU COULD HAVE OPEN DIODE.IF NO POWER TO CLUTCH AND FUSE AND RELAY GOOD.YOU HAVE A FAULTY CONTROL SWITCH OR.BAD PRESSURE SWITCH

check the compressor clutch relay. The contacts may have fused together. If there is something constantly enegizing the coils then it is either a bad switch or a shorted lectronic component, usually a single transistor inside an electronic control box.