Question about 2000 Jeep Cherokee

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How do i jump ac compressor to see if if it

How do i jump ac compressor to see if it works,or add r-13

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  • milkmandougl Jun 28, 2009

    ok great ..now which port do i add to?

  • milkmandougl Jun 28, 2009

    i jumped the switch..all that happened was electric fan came on

  • milkmandougl Jun 28, 2009

    thank you very much

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  • Jeep Master
  • 1,564 Answers

There's a low pressure switch on one of the aluminum tubings leading from the compressor. You can pop off the connector and jump it with a paper clip. Don't let it run long at all for you can cause damage to the compressor. Pick up a charge kit at Autozone for about $40 bucks. All instructions are there, it's quite simple nowadays.

Posted on Jun 28, 2009

  • Dana Newcombe
    Dana Newcombe Jun 28, 2009

    Was the engine running when you junped the switch? The recharge kit will only fit on the larger fill connector(low side) it's quite easy. P.S. If the compressor did not engage the fuse for it (A/C) may be blown, good luck!

  • Dana Newcombe
    Dana Newcombe Jul 25, 2009

    The kit will come with a filling hose, it will only fit the larger one, or, I may have that backwards but either way it will only fit one.

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Posted on Jan 02, 2017

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My AC wasn't working so I thought I needed more freon but when I tried to fill it the gage was in the red. What's wrong with it?


On your gauge,is "red" high pressure or low pressure?
If you are seeing a high pressure on your low side connected gauge and the compressor is not running,that is a "full charge" or better stabilized in the system.If your compressor is not "kicking in" you may have a defective electrical component in the A/C system.With the engine running,you can jump 12v power the the compressor clutch momentarily just to see if it is working.Don't leave it jumped to long as the system is designed to cycle with pressure from the low side pressure switch which is the next place to check and the compressor can also be jumped at the low side switch.
If your "red" is low or no pressure,then you have a leak and repairs to the system to stop the leak will have to be made.You can add 134a at this time with the engine running and A/C requested,and as pressure rises in the A/C system,the compressor should "kick in" and cold air should start flowing in your dash vents.45 degrees at the dash vent airflow temp usually equals a full charge.
DO NOT add any aftermarket "134a" that shows an EXPLOSIVE label on it.These are not 134a and are usually butane and/or propane mixes that you MAY NOT want spraying on you in a collision/any situation where the A/C system has become ruptured/compromised.

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If you do not have enough refrigerant in the system. The low pressure switch will prevent the compressor from engaging to avoid damage.

Check your pressure.

I don't recommend this, but you may need to jump your low pressure switch to get the compressor going to add more refrigerant to the system. But if your low on charge, it may be "best to take it to a shop to have them fill the system".

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Hi, the way to get the compressor to come on is to short the connector to the pressure sensor on the return line. The sensor is along the same line you were trying to charge on. Just remove the connector and use a large paper clip to connect the terminals inside the connector. Please let me know if you have more questions, and thanks for using FixYa.

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1 Answer

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Try checking the spacing of the clutch of the compressor to your A/C...chances are the gap is too large and will not pull down to engage the compressor. That should eliminate the jump wire and keep your car snowing. No clutch to engage the compressor, no A/C.

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1 Answer

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