2003 jeep grand Cherokee Loredo sport utility 4d gets up to 55mph and no faster I'm puzzled help please

SOURCE: 2003 Jeep Grand Cherokee check engine light stays

go to autozone they will check codes for free

ZJ Limited

• 17989 Answers
• Posted on Aug 11, 2009

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.

Instructions:

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."
   

SOURCE: 2003 Jeep Vacuum Diagram

THERE SHOULD BE A EVAP/VACUUM DIAGRAM UNDER THE HOOD ON A WHITE STICKER. SOMETIMES THEY ARE ON THE BOTTOM SIDE OF THE HOOD ITSELF. I HOPE THIS HELPS. PLEASE KEEP ME POSTED THANKS FOR USING FIX-YA AND FOR AN HONEST RATING/COMMENT. GOOD LUCK

SOURCE: i have a 2003 jeep grand cherokee 2.7crd limited

Most larger parts stores carry either chilton or haynes manuals. They are far from perfect and their wiring diagrams are pretty much junk, but overall the do have enough info for most basic and some not so basic repairs. Chilton also offers a download for pay which is better but unless you are doing major complex repair work, likely you won't need it.

SOURCE: 2002 jeep grand Cherokee loredo 4.0 straight 6

On a high mileage engine you should use 10w 30 NORMAL oil not synthetic.