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Re: No power to compressor or clutch
Also bypass the pressure switch using test leads or even a paper clip as this switch can interupt a/c clutch engagement ...it is a high /low switch and can interupt clutch with too high or too low pressure
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Compressor will not run if freon charge low. If you want it to run supply direct power and ground to back of compressor. I do not recommend a home recharge as you will not be able to evacuate the moisture in the system and inject adequate amounts of oil
Which compressor are you talking about? The air ride or the A/C?
For the air ride, it has fuses and relays. All the door jam switches and cargo doors must be shut.
For the A/C, you would verify that the system has Freon before attempting to replace a compressor. A low pressure switch would deactivate the compressor clutch. The system would need to be Evacuated with a Vacuum pump and then recharged, It is not like changing a starter. After prepping the system, you may need to jump the low pressure switch to get an initial charge of Freon, then reconnect the low pressure harness to the cut-out switch.
You need some type of guage to measure the charge. When the system has enough Freon to let the Low pressure switch provide power to the compressor clutch; the signal will be restored to the compressor.
The hvac relay is located in the power distribution box under the hood in position #60. You can swap another 5 terminal relay to test. You did not say what your pressure readings were, but you could have a bit of moisture or a little air trapped in the system causing the intermittent operation. To eliminate this, have the system evacuated with a deep vacuum, then recharged to mfrs. capacity. I hope this helps.
Hi,do you have a guage on your recharge hose to see what pressure your low side is running at?Check your low side hose coming from the compressor,it should be cold.if it is cold you have a problem with your blend door,(check the accuator motor).this should get you started in the right direction.Any more questions just comment back and i'll try to help.Thank You for using fixya......iluv2fish...Ray.....
to prevent damage to the air conditioning system there is a "low pressure switch" located on the condenser near the low pressure hose (large one) .. if the refrigerrant (R134A) gets too low then the clutch will be blocked from activating by that switch .. you can have your system tested and recharged or you can do that yourself .. the R134A is available at auto parts stores .. some come with a gague that is required for proper charge .. if you dont already have a gage then yoiu will need that one ... recharge kits often come with instructions .. other less likely but possible problems could be a fuse or bad AC clutch relay. sometimes damaged wiring or bad clutch will be the problem but much more likely just low fluid ..
you are right, there is a low pressure swich on the system, so if ther is not enough freon in the system it will try and pump only the oil for the compressor, this would damage the compressor and possibly other components you will have to probably charge it a little, the reason why it looked empty on the guage is probably the section of line you are hooked on has the leak and there are check valves on the system preventing back flow which could in theory drain off one section. also water in the system is a possibility