Question about 2004 Jeep Grand Cherokee

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Refill A/C I was fixing a broken PCV valve in my Grand Cherokee and I accidentally broke the seal for one of the A/C pipes. I got a new seal and would like to recharge the A/C but I've heard that if it is totally empty the recharge kits you can buy at any auto store do not work, is this true?

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The A/C system will need to be placed under a vaccum of at a min. of -29.5 HG to verify the seal held and removed the water caused by being open to the enviorment (humitiy ) will cause water in the system witch will damage the matter in the receiver dryier. there is a specific amount and proceedure that will need to be followed to the letter to place a precharge, bypass the low pressure cutoff switch. extream cauation should be used as the Hihg pressure gas and fluid is both very hot and extreamly hi . I would really recommend if you dont have experance and licensed take it to the shop and get it done it will be chaeper that a hospital bill and the repairs if you get it sealed up right it should only cost the evac fee normally .5 hrs labor and R134 of about 2 lbs here in Calf, labor at a normal shop on A/C specials are 40.00 and 19.99 per lbs of R 134 BE CAREFUL
Johnie G
35 yrs ASE
univ A/C cert.

Posted on Oct 24, 2012


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Posted on Jan 02, 2017

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SOURCE: Where do you recharge the airconditioning unit on

Jeep GrandCherokee SUVs manufactured in or before 1995 use R12 refrigerant. You must retrofit these SUVs to accept R134 refrigerant using a retrofit kit available at your local auto parts store before you can recharge the system. In some areas, a license is required to retrofit an air conditioning system. If this is the case in your area, take your Jeep to a professional to retrofit the system.


  1. Step 1 Take your SUV to a mechanic to recover the R12 refrigerant out of the air conditioning system. A license and special equipment are needed to do this. Because R12 refrigerant is expensive, many mechanics will do the job for free.
  2. Step 2 Locate the Low Pressure Side connector port. You will find it on the driver's side of the engine. Remove the blue or yellow cap marked L. You only need to retrofit the system if you see a screw-type connector valve. If you see a quick connect valve, the system already is R134 compatible. Wipe the connector valve off with a clean towel. This ensures that the retrofit connector properly adheres to the valve.
  3. Step 3 Place the long retrofit connector from the automotive retrofit kit onto the Low Pressure Side valve. The retrofit connector has a special adhesive on the threads that will help it adhere to the valve. Screw the connector onto the valve. Tighten the retrofit connector using an adjustable wrench. Place the cap provided in the retrofit kit onto the retrofit connector. This keeps dust out of the system.
  4. Step 4 Follow the air conditioning lines away from the compressor until you see the High Pressure Side port valve. This is located near the Low Pressure Side service port. Remove the red cap and wipe the port off with a towel.
  5. Step 5 Put the shorter adapter onto the port. Twist it using an adjustable wrench until it is securely fastened to the port. Place the red cap from the retrofit kit onto the adaptor.
  6. Step 6 Fill out the Retrofit Identification sticker provided in the retrofit kit using a permanent marker. Remove the protective backing and place it on the interior side of the hood. This lets future owners and service professionals know that the system has been retrofitted.
  7. Step 7 Recharge the air conditioning system. See the related eHow titled "How to Recharge Air Conditioning with Freon in a Jeep Grand Cherokee."
Never try to evacuate the system yourself. A license and special equipment is needed to evacuate the system. Attempting to do this yourself will release refrigerant into the air, which is a federal crime.

Good luck (rated this help).

Posted on Aug 11, 2009

  • 550 Answers

SOURCE: 1995 jeep cherokee coolant line broke we fixed it

Take it back to the shop that fixed it or if you did it yourself, check that you didn't disconnect a sensor/plug from the transmission.

Posted on Mar 10, 2010

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SOURCE: I have a 2006 Jeep Grand Cherokee. I was told by


I searched pep boys, advancedauto and autozone and found no PCV valve listed for your 4.7.

I can say however that the last model Jeep (WJ) with the 4.7 had a PCV valve (cuz I owned one), and yes it was on the side of the engine.

You may also like to know that 4.0 (ZJ) Jeeps dont have PCV valves as well (cuz I owned 2) however the V8 (ZJ) V8s do have one (cuz I owned the rare 5.9).

Hope this helps.

Posted on Dec 29, 2010

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