Question about 1998 Pontiac Bonneville

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Replaced ac compressor and now trying tocharge system but i cannot get the compressor to cycle.have power to one leg of compressor.

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  • Anonymous Nov 11, 2010

    Discribe what your doing
    Replaced Compressor
    Pulled a Vacuum
    Won't take Refrigerant?

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  • 39 Answers

It wont come on until you have some refrigerant in system.

Posted on Nov 11, 2010

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Hello narto7
If you replaced the compressor yourself and tried to charge the system with those booster cans from the parts store, then air and moisture remained in the system. This will prevent you from getting the correct
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I just had to have the A/C compressor replaced and now the engine seems to surge at hiway speeds. More so when cruise control is engaged. Is there any connection to the replacement and the engine problem?...


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The AC compressor clutch repeatedly tries to kick in when the AC is off (vent or defrost is on) in my 2006 Ford Ranger. What to do?


The ac compressor will cycle when in the defrost position. The system is designed this way, so that the freon will circulate at times in the system so the seals don't get hard or crack. Otherwise, you would have to replace the seals in your ac about once a year. If it is cycling too often then the freon may be liw and the system needs recharged. If your ac does not work and you are not going to repair the system. You can unplug the compressor so it won't come on and put a load on the engine.

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The power to run the compressor clutch coil goes from the battery, to the AC Clutch Relay, somewere in the engine compartment fuse box, then it goes to the positive side of the AC compressor clutch coil; goes thru the coil, activating the compressor, and then goes to complete the circuit through another switch (high pressure protection switch) in the back of the AC compressor and finally reaching negative or Ground.

Disconnect the AC compressor clutch connector and using a 12 V bulb with 2 wires (test lamp) check the following:

1.- connect 1 lamp wire to battery neg; with the other check both pins at connector with the AC in the RUN (AC and ignition switch on ) you should have power in one side.

2.- connect 1 lamp wire to battery positive and with the other check both pins at connector, lamp should light getting the ground from the clutch connector thru the high pressure compressor switch to ground.

On the other side what makes the relay close and let the power flow to the clutch works with the low pressure switch, (if the freon pressure is too low it opens and kills the ground to the relay coil and that kills the compressor), that low pressure switch is in the low pressure side of the freon tubing, the fat pipe that comes from inside the firewall into the accumulator/dryer, a big aluminum cylinder sitting on the right side of the engine compartment in GM cars.

To know if the low press switch is the cause you can unplug it and connect both legs with a paper clip for a minute or two, no more, you don't want to damage the compressor. anyway if jumping the switch makes the compressor come alive and kick in, you either have low freon pressure or a bad switch; it's time for the pressure gauges and check how the compressor is pumping and that is better left to a pro.

By the way you said that your system is a R-12 system, have you considered switching to R-134a the new "ozone friendly" freon? to do that you need to evacuate the system with a recycling machine and pull vacuum in your AC, if it holds the vacuum for a while, then you can be sure that there are not leaks and then dump 1.5 or 2 pound (check the labels in the engine compartment) of R-134a into your system. it will be a good idea to put some fluorescent leak detecting dye in the system to check for leaks, just in case..

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Please help me have AC


Just call me 925-459-0571

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